Wigner’s friend thought experiments have long challenged whether measurement outcomes can be absolute; here, the author examines whether even the “free choices” observers make in setting up an experiment can be absolute. By combining the Wigner’s friend scenario with the Pusey–Barrett–Rudolph theorem on the reality of the quantum state, the author derives a no-go result suggesting that any resolution to extended Wigner’s friend paradoxes that abandons absoluteness must also incorporate a relational nature for free choices.

[Phys. Rev. A 114, 032431] Published Mon Sep 14, 2026

The authors present a combined theoretical and experimental advance showing that $d$+1 projective measurement bases suffice for complete quantum-state tomography in any finite dimension, without relying on mutually unbiased bases. They demonstrate the scheme on a silicon photonic chip, achieving fidelities above 0.96.

[Phys. Rev. A 114, 032428] Published Thu Sep 10, 2026

The authors systematically map the four-dimensional parameter space of double microwave shielding using universal dimensionless calculations to identify operating regimes free of field-linked bound states. By incorporating realistic experimental field constraints, they demonstrate that heavy, strongly dipolar molecules achieve strong two-body loss suppression alongside broad tunability of effective dipolar interactions.

[Phys. Rev. A 114, 033315] Published Thu Sep 10, 2026

Because ideal Gottesman-Kitaev-Preskill (GKP) states are invariant under stabilizers, researchers often assume that measuring a state’s stabilizers directly quantifies its closeness to an ideal GKP state. In fact, the author shows that high stabilizer expectation values only provide an upper bound on proximity, and that states far from an ideal GKP state can still yield excellent stabilizer expectation values.

[Phys. Rev. A 114, 032413] Published Tue Sep 08, 2026

The authors develop an instantaneous-mode description for dispersive laser cavities by exploiting the separation of timescales between fast cavity fields and slow carrier dynamics. By deriving low-dimensional rate equations parametrized directly by the effective mirror reflectivity, the approach accurately reproduces full-model self-pulsing dynamics in Fano lasers and simplifies the stability analysis of dispersive instabilities.

[Phys. Rev. A 114, 033507] Published Tue Sep 08, 2026

The authors show how quantum coherence fluctuations of light can serve as a degree of freedom for squeezing. They demonstrate that squeezing these fluctuations leads to squeezing of the magnitude and/or position of interference fringes for both bright and single-photon light.

[Phys. Rev. A 114, L031701] Published Tue Sep 08, 2026

The authors realize a new dipolar mixture of Bose-Einstein condensates of Dy isotopes. The mixture features a broad interspecies Feshbach resonance, which allows the authors to control a miscible-immiscible transition in the binary mixture.

[Phys. Rev. A 114, L031301] Published Tue Sep 01, 2026

The authors establish a relation between the conservation of coherence and the conservation of energy. They analyze partially coherent fields in the focal region of a converging lens, and show topological differences between the coherence flux and the energy flux.

[Phys. Rev. A 114, 022211] Published Tue Aug 18, 2026

The authors extend analytical derivations for expectation value distributions to random mixed quantum states and general measurement operator sets, using a combinatorics framework to calculate their moments. Using simulated noisy brickwork circuits, they introduce an effective global depolarizing model that accounts for empirical peak behaviors and reveal that non-symmetric measurement sets yield distinct multimodal distributions.

[Phys. Rev. A 114, 022434] Published Mon Aug 17, 2026

The authors calculate quantum memory efficiency in a cavity-coupled ensemble of spins by examining absorption and emission efficiency. Based on this they design a method for storage and retrieval that involves modulating the coupling strength between the cavity and the ensemble.

[Phys. Rev. A 114, 022615] Published Fri Aug 14, 2026

The authors develop an analytical theory for the complex subradiant eigenvalues of a finite one-dimensional emitter array coupled to an ideal or nonideal waveguide. They demonstrate that while Bragg-edge destructive interference drives an $N^{-3}$ linewidth scaling with deep-subwavelength parity oscillations, near-field dipole-dipole interactions dominate the collective energy shift, which exhibits a distinct $N^{-2}$ finite-size correction.

[Phys. Rev. A 114, 023711] Published Wed Aug 12, 2026

The authors investigate the out-of-equilibrium dynamics of a periodically driven one-dimensional Bose gas in a box trap, demonstrating a transition from a dilute soliton gas to a regime of soliton turbulence with strongly intertwined defects as the drive strength increases. Using an inverse scattering transform analysis, they identify distinct power-law decays in the momentum distribution that characterize each regime and discuss their feasibility for experimental observation.

[Phys. Rev. A 114, 023310] Published Mon Aug 10, 2026

The authors present a device-independent protocol for characterizing unsharp quantum instruments using an entanglement‑assisted code with restricted classical communication between two parties. They experimentally demonstrate the predicted enhancement in decoding probability by implementing tunable unsharp measurements with a Mach-Zehnder interferometer.

[Phys. Rev. A 114, 022411] Published Thu Aug 06, 2026

Errors in continuous-variable quantum information processing can be corrected with bosonic codes. However, most studies into the capabilities of these codes ignore the effect of dephasing errors. Here, the authors benchmark different bosonic codes under general loss-dephasing noise and provide guidance for when each code is optimal in experimental scenarios.

[Phys. Rev. A 114, 012450] Published Tue Jul 21, 2026

The authors demonstrate three-dimensional sub-Doppler cooling of a single ${}^{40}$Ca${}^{+}$ ion confined within a compact Penning trap by exploiting a two-photon dark resonance. By incorporating a parametric drive to the trap electrodes that coherently exchanges motional occupations between the axial and radial modes, they achieve sub-Doppler cooling across all degrees of freedom using only axially propagating laser beams.

[Phys. Rev. A 114, 013119] Published Mon Jul 20, 2026

The authors perform low-frequency electric field sensing using ionization detection on a collimated beam of Rydberg atoms. This reduces challenges associated with electric field screening effects present in warm vapor cells containing alkali-metal atoms.

[Phys. Rev. A 114, 012608] Published Tue Jul 07, 2026

The authors present a combined experimental and theoretical study of short-lived, laser-dressed doubly excited resonances in helium near the $N$=3 ionization threshold. The results establish a quantitative approach by channel-resolved photoelectron spectroscopy to characterize and control correlated two-electron resonances in strong laser fields.

[Phys. Rev. A 114, 013105] Published Tue Jul 07, 2026

The Mpemba effect happens when a system initially further from equilibrium relaxes faster than a system closer to equilibrium. The authors study the relaxation of systems whose effective dynamics are described by Davies maps, providing a framework to engineer the quantum Mpemba effect in Markovian open quantum systems.

[Phys. Rev. A 114, 012418] Published Mon Jul 06, 2026

The authors propose a quantum metrology framework that harnesses the narrow linewidths of subradiant collective states in subwavelength emitter arrays. By introducing spatially varying control detunings to couple dark and bright modes, they show that the resulting sharp features in the transmission spectrum enable the precise detection of both global and local perturbations under realistic experimental imperfections.

[Phys. Rev. A 114, 013704] Published Mon Jul 06, 2026

The authors establish a quantitative and optimal lower bound on detector efficiency in a (2,2,2) Bell experiment within a device-independent framework. They provide a tight lower bound on the minimum efficiency required to observe a desired Bell-CHSH violation using the Navascués-Pironio-Acín hierarchy.

[Phys. Rev. A 114, 012404] Published Wed Jul 01, 2026

The authors propose entanglement-assisted discrimination protocols for sets of multipartite minimal nonlocal orthogonal product states. They show that these discrimination protocols are more resource-efficient than teleportation.

[Phys. Rev. A 113, 062465] Published Fri Jun 26, 2026

The author presents an octant geometric framework that maps higher-order, three-state optical modes onto the positive surface of a sphere spanned by a torus. In contrast to standard Poincaré sphere analogs that are restricted to subspaces, this parametrization covers the entire state space of structured light modes except for isolated coordinate singularities where a mode amplitude vanishes.

[Phys. Rev. A 113, 063530] Published Fri Jun 26, 2026

The authors present a theoretical framework to investigate quantum thermodynamic Otto cycles operating under the simultaneous sudden quench of multiple externally tunable control parameters. Applying this formalism to both a harmonically trapped one-dimensional Bose gas and the transverse-field Ising model, they demonstrate that multiparameter control yields a significant cooperative enhancement to net work and efficiency, dramatically outperforming the combined output of individual single-parameter cycles.

[Phys. Rev. A 113, 063319] Published Thu Jun 18, 2026

The authors demonstrate a unified scattering framework for coordinated control of lasing and absorption based on a gain-loss-engineered Fabry–Pérot microcavity supporting a pair of conjugate exceptional points. Through tailored state switching enabled by non-Hermitian topology, the system exhibits a frequency-matched dual-state coexistence of amplification and absorption, opening new opportunities for multifunctional photonic devices.

[Phys. Rev. A 113, 063521] Published Thu Jun 18, 2026

The authors report on the high-resolution spectroscopy of over 700 Rydberg states in ${}^{162}$Dy using two-color trap depletion spectroscopy in a magneto-optical trap. They apply a multichannel quantum defect theory approach to benchmark and refine the assignments and to characterize six observed perturbing states belonging to higher ionization limits.

[Phys. Rev. A 113, 062807] Published Mon Jun 15, 2026

The authors prove that the entropic uncertainty relation with a quantum memory intrinsically connects local preparation contextuality with bipartite entanglement or Bell-CHSH nonlocality, which is captured by two quantitative trade-off relations via a faithful criterion for the contextuality detection. They further verify the theoretical results on solid-state superconducting systems through two independent demonstrations on the Quafu quantum cloud platform.

[Phys. Rev. A 113, L060405] Published Mon Jun 08, 2026

The authors suggest a way to detect time-reversal-symmetry breaking using a driven-dissipative superconducting ring resonator. In particular, nonlinear interactions can enforce symmetric steady-state photon populations, which become asymmetric when even weak symmetry breaking is present, allowing for a sensitive probe of time-reversal-symmetry-breaking effects in quantum materials and providing an interesting use case for superconducting microwave resonators outside of quantum information processing.

[Phys. Rev. A 113, 062402] Published Mon Jun 01, 2026

The authors show that quantum entanglement can organize into fractal geometric patterns due to repeated random measurements. They mapped the geometry of clusters of entangled qubits, finding that the largest cluster is riddled with holes at different scales, like the irregular self-repeating structure of coastlines or snowflakes.

[Phys. Rev. A 113, L060402] Published Mon Jun 01, 2026

The modular exponentiation operation has long limited the practical applications of Shor’s algorithm, and has often had to be tailored to the number being factorized. Here, the authors present a modular exponentiation circuit using generalized discrete Fourier transforms, achieving a desirable gate complexity.

[Phys. Rev. A 113, 052448] Published Fri May 22, 2026

The authors develop a theoretical framework for strong-field quantum optics based on the Heisenberg picture, and derive beyond-semiclassical corrections to the emitter dynamics due to the coupling to the quantized electromagnetic field. Closed-form expressions for spectra, squeezing, and photon statistics are derived and applied to both atomic ensembles and correlated systems.

[Phys. Rev. A 113, 053115] Published Fri May 22, 2026

The authors experimentally demonstrate a compact dual-species cold-atom setup capable of simultaneous high-flux loading of lithium-6 and rubidium-87 atoms. It represents a major step towards miniaturized systems for dual-species cold-atom experiments and ultracold polar molecule production.

[Phys. Rev. A 113, 053309] Published Mon May 11, 2026

Tying together classical attractor dynamics and dissipative quantum systems, the authors investigate the quantum-to-classical crossover of quasiperiodic attractors, specifically limit tori in coupled Kerr cavities. They identify a universal “quantum melting” process driven by dephasing.

[Phys. Rev. A 113, 052208] Published Fri May 08, 2026

The authors experimentally study the decay of a dense, ultracold sample of weakly bound DyK dimers stored in an optical dipole trap. They identify trap-light-induced and collisional processes as the two main sources of losses, and demonstrate ways to reduce these losses substantially.

[Phys. Rev. A 113, 053306] Published Fri May 08, 2026

The authors introduce a Floquet quasinormal mode formalism for describing the transient response of time crystals. They analyze the emergence of exceptional points and non-perturbative phenomena relevant to recent experiments.

[Phys. Rev. A 113, 043526] Published Wed Apr 29, 2026

The authors introduce a scheme for laser cooling and magneto-optical trapping of the group-IV atoms, including silicon, germanium, tin, and lead, with a much more challenging structure than the usual alkali-metal and alkaline-earth-metal atoms. They propose an experimental setup for realizing a magneto-optical trap for tin and discuss a wide variety of potential applications.

[Phys. Rev. A 113, 043115] Published Mon Apr 13, 2026

The authors introduce a single-photon transduction scheme based on two-dimensional arrays of Rydberg atoms using four-wave mixing and quantum scattering. It may allow for efficient and mode-selective terahertz-to-optical transduction.

[Phys. Rev. A 113, 043716] Published Wed Apr 08, 2026

The authors report on final-state-resolved Auger decay of 1$s$ vacancies in N${}_2$ using a newly developed apparatus combining a double toroidal electron analyzer with pulsed fragment-ion mass and momentum detection. The setup allows them to resolve the binding energy of the Auger final state, the kinetic energy of the fragment ion, and Auger-electron angular distributions in the molecular frame of reference, ultimately enabling assignment of state-to-state dissociation channels.

[Phys. Rev. A 113, 032818] Published Thu Mar 26, 2026

The authors present a framework for dynamical quantum tomography, in which a system is allowed to evolve before performing tomographic measurements, thus providing data on new parts of the system’s state space. They illustrate their framework with applications to a spin chain and an electron-nuclear system.

[Phys. Rev. A 113, 032435] Published Tue Mar 17, 2026

The authors solve the two-body scattering problem in confined Rabi-coupled bosonic mixtures analytically. They show that coherent driving shifts the confinement-induced resonance to much smaller scattering lengths than in the uncoupled case.

[Phys. Rev. A 113, L031302] Published Fri Mar 13, 2026

In this work, which has been published jointly with a PRL paper, the authors present a method using tropical algebra and graph theory to understand translation-invariant Bell inequalities, which are crucial for detecting quantum nonlocality in large systems. Specifically, they show that determining the classical bounds of Bell inequalities can be effectively formulated as the contraction of an associated tensor network in tropical algebra.

[Phys. Rev. A 113, 032421] Published Thu Mar 12, 2026

The authors demonstrate that in a tunneling-driven two-photon Jaynes-Cummings junction, dissipation engineering can steer quantum phase transitions: single-photon loss triggers a first-order transition, while two-photon loss stabilizes it as a continuous second-order transition; introducing electronic dissipation can further switch the transition order across different photon statistics. This transforms dissipation from a detriment into a resource for sculpting quantum criticality in open quantum systems.

[Phys. Rev. A 113, 033708] Published Mon Mar 09, 2026

The authors present a theoretical model for calculating the rotational-coupling effects on diatomic open-shell systems based on the four-component multireference wave function. The calculated splittings could contribute to ongoing experimental efforts to measure the electric dipole moment of the electron, and to probe for nuclear charge-parity violation through the nuclear magnetic quadrupole moment.

[Phys. Rev. A 113, 032809] Published Thu Mar 05, 2026

The authors experimentally demonstrate strong spatial confinement of optical excitations by broadband composite pulse sequences in a rare-earth-ion–doped crystal, which provides significant improvements in localization and robustness against disorder compared to previous experiments.

[Phys. Rev. A 113, 023117] Published Mon Feb 23, 2026

The authors explore a strongly driven disordered ensemble of emitters coupled to a single photonic mode. They find that long-lived subradiant correlations persist even in the presence of inhomogeneous broadening, which generally destroys correlations.

[Phys. Rev. A 113, 023709] Published Thu Feb 12, 2026

The authors report on a combing technique to remove vortices from a quasi-two-dimensional Bose-Einstein condensate through the application and subsequent removal of a one-dimensional optical lattice. The study includes experimental results on a rubidium BEC and numerical simulations based on the Gross-Pitaevskii equation.

[Phys. Rev. A 113, 023305] Published Wed Feb 04, 2026

The authors employ relativistic coupled-cluster theory to calculate the electric dipole polarizabilities, electric quadrupole moments, atomic lifetimes, and hyperfine structure constants of clock states in singly charged calcium, strontium, and barium ions. By incorporating triple excitations, the authors achieve sub-one-percent accuracy across several spectroscopic properties, providing a rigorous comparison with experimental data and previous calculations.

[Phys. Rev. A 113, L011101] Published Fri Jan 23, 2026

The authors investigate the behavior of the electron quiver amplitude in a disordered Su-Schrieffer-Heeger-chain model using high-order harmonic generation (HHG) as a probe. Comparing chains with and without long-range order, they find that, under certain conditions (low disorder and similar nearest-neighbor distributions), they exhibit nearly identical HHG spectra.

[Phys. Rev. A 113, 013115] Published Tue Jan 13, 2026

The authors theoretically investigate the possibilities of using the stimulated Raman adiabatic passage (STIRAP) and its variants to control a coherent superposition of quantum states. They present a generalization of the so-called fractional STIRAP, demonstrating precise control over the mixing ratio of quantum states in the wave packet.

[Phys. Rev. A 113, 013112] Published Fri Jan 09, 2026

The authors study mechanisms that can possibly account for the anomalous three-body decay reported for a three-component Fermi gas of ${}^6$Li. They calculate dimer formation rates and atom-dimer scattering cross sections in a three-component Fermi gas using both coupled-channel calculations with the hyperspherical coordinate approach and Monte Carlo simulations. The results provide a plausible explanation for the anomalous decay.

[Phys. Rev. A 113, 013309] Published Thu Jan 08, 2026

The authors outline a proposal that uses multiple atoms coupled to an optical mode in a cavity to generate Schroedinger cat states of optical photons. They show that cat states with mean photon numbers around 30 could even be feasible with existing technology.

[Phys. Rev. A 113, 013708] Published Fri Jan 02, 2026

The authors report experimental results on the Coulomb explosion of H${}_2$ molecules inside helium nanodroplets using ion-ion coincidence analysis. The study provides insights into the translation, dissociation, and solvation processes of light impurities in a quantum liquid, underscoring the critical role of droplet size in shaping fragment kinetics during these processes.

[Phys. Rev. A 112, 063118] Published Tue Dec 23, 2025

The authors report the creation of an ultracold gas of bosonic ${}^{39}$K ${}^{133}$Cs molecules via magnetoassociation across an interspecies Feshbach resonance, providing the necessary starting conditions for the creation of ground-state molecules. They also perform Feshbach spectroscopy to observe several new resonances.

[Phys. Rev. A 112, 062821] Published Mon Dec 22, 2025

The authors theoretically study ultracold dipolar atoms in an elongated external trap and their mapping onto a strictly one-dimensional system. They show that a full three-dimensional treatment is necessary to capture the subtle influence of long-range dipole-dipole interactions, especially at short interatomic distances where coupling to excited transverse modes becomes significant.

[Phys. Rev. A 112, 063318] Published Fri Dec 19, 2025

The author theoretically studies the formation and properties of a supersolid structure in a three-component ultracold Bose gas mixture composed of ${}^{23}$Na, ${}^{39}$K, and ${}^{41}$K atoms at zero temperature. An extended linear chain structure, made by periodic repetition of the basic building block represented by a “dimer” unit consisting of two weakly bound quantum droplets, is identified.

[Phys. Rev. A 112, 063317] Published Thu Dec 18, 2025

The manuscript proposes a method of controlling optical torque using the phase difference between different light fields. This could enable the manipulation of atomic currents in ring-shaped optical geometries.

[Phys. Rev. A 112, 063720] Published Thu Dec 18, 2025

Photonic entanglement distribution is key for the emerging quantum internet. Here, the authors propose a spectral-multiplexing scheme that delivers favorable entanglement rates by combining domain-engineered crystals with zero-added-loss multiplexing. Their scheme uses a down-conversion crystal that can produce photon pairs in distinct, spectrally factorable “islands”, and by combining same- and cross-island heralding, they dramatically reduce the number of required spectral channels.

[Phys. Rev. A 112, 062616] Published Wed Dec 10, 2025

The authors study the time modulation of the momentum distributions of one-dimensional Bose-Bose mixtures with strong repulsive interactions, described via SU(2)-symmetry-breaking Hamiltonians. They show that the phenomenon of symmetry oscillations is not restricted to a specific model or fine-tuned parameters, but instead constitutes a robust and universal dynamical feature of multicomponent strongly interacting one-dimensional quantum mixtures.

[Phys. Rev. A 112, 063308] Published Wed Dec 10, 2025

The authors look at phase-only reconstruction, a known signal-analysis method, in a quantum-mechanical scenario. Classically, the phase of a complex-valued Fourier transform of a signal encodes much more information than its amplitude, and they show that this fact is still true in the quantum case. Indeed, the phase of the momentum wave function contains almost all of the information of the underlying quantum state.

[Phys. Rev. A 112, 062210] Published Mon Dec 08, 2025

The authors discuss the possibility of generating squeezed photon bundles in cavity QED using parametric driving and a phase-matched squeezed reservoir. With their scheme, they show a substantial increase in the average two-photon bundle emission without compromising on purity.

[Phys. Rev. A 112, 063703] Published Wed Dec 03, 2025

The authors report on the production of a beam of S(${}^1{D}_2$) atoms with a well-defined and tunable velocity, narrow velocity spreads, and a high quantum-state purity using a multistage Zeeman decelerator. The results could open the possibility of future studies of reactive and quenching processes involving S(${}^1{D}_2$) atoms at tunable and well-defined collision energies.

[Phys. Rev. A 112, 053113] Published Fri Nov 21, 2025

The authors rigorously show that interacting quantum emitters can be used to generate polarization-entangled photon pairs. It is sufficient that the emitters exhibit two-level system behavior and that their transition dipole moments are oriented perpendicular to each other, which could be achieved with, e.g., organic molecules, trapped ions, quantum dots, and diamond-color centers.

[Phys. Rev. A 112, 052434] Published Wed Nov 19, 2025

The authors study the transmission, reflection, and absorption of transverse-electric-polarized light by metallic metasurfaces, showing they can facilitate perfect absorption and zero reflection at different tunable critical angles, known as the Brewster angles. This provides a simpler alternative to traditional methods for achieving the transverse-magnetic electric Brewster effect, which typically rely on bulk magnetic media.

[Phys. Rev. A 112, 053516] Published Mon Nov 17, 2025

The authors propose and implement a protocol to observe spin-dependent forces in Rydberg atoms by measuring the state-dependent motion of the atoms induced by dipole-dipole interactions. The work potentially paves the way for controlling atomic motion, both for utilizing it as a quantum resource and for mitigating its limiting effects in certain applications.

[Phys. Rev. A 112, 053717] Published Mon Nov 17, 2025

The authors study the transient optical response of a Bragg mirror made of cold atoms trapped in a one-dimensional lattice. They find that after the switch-off of the incoming beam, depending on its frequency, the reflected intensity can temporarily increase, or, on the contrary, can undergo a decay much faster than the natural timescale of the response of individual atoms.

[Phys. Rev. A 112, L051701] Published Fri Nov 14, 2025

This is a comprehensive study on how knowledge of the physical noise model affects the performance of surface-code decoders in quantum error correction. While noise generally requires many parameters to describe completely, the author finds that to achieve near-optimal decoding, it is only necessary to adapt the decoder to a small number of critical parameters.

[Phys. Rev. A 112, 042431] Published Thu Oct 23, 2025

The authors investigate a quantum metrological protocol operating in a non-Markovian environment, and examine how memory effects influence the evolution of the system under different temperature conditions. They find non-Markovianity and position-momentum correlations can jointly be valuable resources to enhance metrological performance.

[Phys. Rev. A 112, 042424] Published Wed Oct 15, 2025

Despite their prevalence in cold-atom physics, magneto-optical traps are still modeled semiclassically, with the exception of some numerical works on quantum models performed decades ago. Here, the authors present a quantum theory of the magneto-optical trap from first principles, providing a significant step towards a complete theoretical understanding of laser cooling and trapping of atoms.

[Phys. Rev. A 112, 043112] Published Tue Oct 14, 2025

The authors present a combined experimental and theoretical study of strong-field-induced electronic coherences in argon and molecular nitrogen ions as a step towards strong-field coherent control in molecular chemistry. They find that nonsequential double ionization in the low-intensity region of the focal volume can reduce the visibility of coherence generated by two-pulse sequential ionization, and quantify the importance of pulse shape and spectral characteristics for isolating the desired coherence signals.

[Phys. Rev. A 112, 043113] Published Tue Oct 14, 2025

The authors investigate the role of confinement-induced resonances in low-dimensional ultracold atomic mixtures for the formation of weakly bound dimers. They identify viable pathways for creating RbSr molecules, which could open the door to producing other molecules made up of alkali- and alkaline-earth-metal atoms.

[Phys. Rev. A 112, 043313] Published Tue Oct 14, 2025

Parametric perturbations of a Kerr oscillator are shown to induce persistent classical and quantum echoes in the dynamics of both coherent states and Schrödinger cat states. Quantum echoes are highly sensitive to the parameters of the cat states and can be recovered even when dissipation suppresses quantum revivals.

[Phys. Rev. A 112, L040601] Published Wed Oct 08, 2025

Two-photon transitions in ladder systems have been well-studied for decades, but the field is experiencing a resurgence due to interest in quantum dots and artificial atoms. Here, the authors study the experimentally relevant case of atoms with a three-level ladder structure driven by a coherent field close to two-photon resonance.

[Phys. Rev. A 112, 043701] Published Thu Oct 02, 2025

In this manuscript, along with its PRL counterpart, the authors describe a method for quantum trajectory simulations of non-Markovian open quantum systems. They show how the efficiency can be increased with a simple transformation that renders the evolution near unitary. They demonstrate the method using an example problem, the decay of emitters in a cavity, and show that they can achieve exact numerical solutions for system sizes an order of magnitude larger than what was previously possible.

[Phys. Rev. A 112, 033719] Published Fri Sep 19, 2025

The authors derive lower bounds on sample complexity for quantum state certification, related to the size of measurement operators. These bounds assess protocol efficiency and show that local Haar measurement protocols cannot be efficient for all states.

[Phys. Rev. A 112, 032217] Published Thu Sep 18, 2025

The authors present frequency-comb-referenced spectra of the c-a system in He${}_2$ with full resolution of the rotational, spin-spin, and spin-rotational fine structure. Combining the new data with earlier measurements, they determine transition frequencies, term values, and spectroscopic constants of the constituent states with greatly improved precision, providing benchmark data for comparisons with high-level ab initio theory.

[Phys. Rev. A 112, 032807] Published Mon Sep 15, 2025

The authors establish a strong-field theory for ultrafast electron transport in ultrathin metal-insulator-metal nanojunctions, accounting for the image potential inside the gap and boundary effects. They find that the Keldysh parameter alone is insufficient for describing the physics in these systems, introduce an additional parameter that accounts for the effects of the limited size of the junction, and provide several interpretations of the parameter that shed new light on the complex physics in the light-driven junction.

[Phys. Rev. A 112, 033104] Published Thu Sep 11, 2025

The fact that the shape of orientation-dependent molecular ionization rate curves can deviate from the shape of the ionized orbital at higher field strengths is often attributed to the increasing contribution of excited states in the process. In this work, the authors uncover a different mechanism, and show that orbital distortion and parabolic channel effects, which are independent of excited-state effects, can significantly modify the angular dependence of ionization yields as well.

[Phys. Rev. A 112, 033103] Published Wed Sep 10, 2025

The authors propose a method for trapping atomic hydrogen in a magic-wavelength dipole trap using a combination of magnetic deceleration, velocity-selective deflection, and photon-recoil-assisted loading. The proposal could potentially lead to the development of a hydrogen optical atomic clock, the transition frequency of which can be linked to fundamental constants.

[Phys. Rev. A 112, 033101] Published Tue Sep 02, 2025

The authors create a spatially bounded supersonic region in a two-dimensional atomic superfluid, forming an acoustic analogue of a black-hole horizon. The observed superflow appears to be modulated by quasi-periodic bursts of superluminal signals. By measuring their frequencies, the authors find agreement with numerical simulations of soliton oscillation frequencies within the black-hole horizon, where solitons are emitted due to the Landau instability.

[Phys. Rev. A 112, L031301] Published Tue Sep 02, 2025

Floquet error-correcting codes usually involve non-trivial geometries and encode a small number of logical qubits, but here the authors introduce a Floquet code construction based on the simple Bacon-Shor code, defined on a square lattice, encoding many more logical qubits than previously thought. This opens a new door for dynamical code design.

[Phys. Rev. A 112, 022436] Published Fri Aug 29, 2025

The “information lattice” framework provides a scale- and space-resolved decomposition of quantum correlations in a state, enabling a hydrodynamic description of information flow. Using this approach, the authors reveal how quantum information spreads in quenched one-dimensional fermionic systems, uncovering signatures such as information interfaces and transport from topological edge modes.

[Phys. Rev. A 112, 022221] Published Wed Aug 27, 2025

The authors present a high-resolution spectroscopic characterization of deprotonated para-coumaric acids, probing specifically electronic excitations near threshold. The results provide insight into the dynamics of electron capture and release in dipole-bound systems, relevant for modeling processes in both interstellar environments and biological systems.

[Phys. Rev. A 112, 022821] Published Wed Aug 27, 2025

The authors find that if sufficiently many uses are made of any quantum measurement, except a trivial one, it can reproduce any other quantum measurement arbitrarily well. That is, all measurements are asymptotically equivalent to each other. Furthermore, the error drops off exponentially fast with the number of uses, meaning their result could have practical applications.

[Phys. Rev. A 112, 022405] Published Fri Aug 01, 2025

The authors discuss benefits of using Th${}^{4+}$ ions for nuclear clocks, consider the effect of electrons on the nuclear transition frequency, and expand on previous work to calculate the relevant energy levels. They show that the use of the Th${}^{4+}$ ion could substantially increase nuclear clock accuracy beyond the 19th decimal place.

[Phys. Rev. A 112, 023103] Published Fri Aug 01, 2025

The authors probe current correlations in open quantum systems as effective signatures for the onset of driven-dissipative phase transitions. They observe characteristics of critical slowing down in two system models, and show how this method could be implemented in experimental optical systems to detect criticality.

[Phys. Rev. A 112, 012226] Published Wed Jul 30, 2025

The authors experimentally demonstrate nondemolition fluorescence readout and high-fidelity unconditional reset of a superconducting fluxonium qubit via on-chip dissipation engineering. The results highlight the potential of superconducting quantum computing architectures without relying on dispersive interaction between qubits and resonators. 

[Phys. Rev. A 112, 012624] Published Mon Jul 28, 2025

The authors derive a master equation governing emission from pairs of quantum emitters, focusing on the effect of gain on the emission dynamics and inter-emitter coupling. The general theory is then applied to a model of a plasmonic resonator to calculate decay and field-mediated coupling rates.

[Phys. Rev. A 112, 013532] Published Mon Jul 28, 2025

The authors report narrowline cooling of single dysprosium atoms trapped in a one-dimensional optical tweezer array close to the motional ground state in the radial direction of the tweezers. They demonstrate the possibility to manipulate the motional degree of freedom of dysprosium in optical tweezer arrays, a key ingredient to exploit the potential of lanthanide-based tweezer platforms for quantum science.

[Phys. Rev. A 112, 013316] Published Fri Jul 25, 2025

The authors study how a twist in geometrical boundary conditions of a resonator results in helicity of the corresponding electromagnetic field. This work introduces a new source of helicity that can be used for both engineering and sensing of electromagnetic fields. 

[Phys. Rev. A 112, 013530] Published Thu Jul 24, 2025

The authors use a microwave field to probe the least-bound molecular states of sodium at ultracold temperatures, and compare their results with numerical calculations using known interaction potentials between two sodium atoms. The precision of the results exceeds that of previous measurements by almost three orders of magnitude.

[Phys. Rev. A 112, 013312] Published Tue Jul 22, 2025

The authors study a three-component Fermi gas where two of the components are strongly coupled by a continuous Rabi drive, forming hybrid superpositions, and interacting with the uncoupled third component. They map out rich ground‑state crossovers (BCS–BCS, BCS–BEC, and BEC–BEC) and predict a metastable “excited” superfluid branch.

[Phys. Rev. A 112, 013314] Published Tue Jul 22, 2025

The authors present a novel and potentially powerful extension of the hierarchical-equations-of-motion technique that uses an input-output point of view to explore both the system and bath dynamics in an open quantum system setting. The formalism can find applications in the modeling of both Lindblad and more general non-Markovian regimes whenever the inclusion of wave packets in the bath or the computation of the dynamics of bath observables is desirable.

[Phys. Rev. A 112, 012211] Published Tue Jul 15, 2025

The authors study how the coupling of a quantum system to a non-Markovian environment can be used to generate and reshape phase transitions and squeezing in matter phases, and introduce the concept of directional spontaneous symmetry breaking. They also propose an experimental implementation of their non-Markovian model in a cavity-QED setup.

[Phys. Rev. A 112, 012210] Published Fri Jul 11, 2025

The authors consider the statistical quantum mechanics of a particle and its environment that are subjected to an external electric field. They consider the effect that a time-dependent field has on the bath, not just on the particle, making their analysis more realistic than previous approaches.

[Phys. Rev. A 112, 012207] Published Thu Jul 10, 2025

The authors realized and characterized a nanofiber-based dipole trap, which allows for trapping and optically interfacing one-dimensional arrays of cesium atoms with a lattice spacing of about one-third of their resonant wavelength on the $D_2$ transition. This trapping scheme can serve as a platform for experimentally observing novel collective radiative effects, such as selective radiance.

[Phys. Rev. A 112, L011701] Published Mon Jul 07, 2025

Quantum speed limits tell you how fast a quantum system can change its state based on the amount of available energy. Here, the authors derive a family of quantum speed limits for general nonunitary physical processes in terms of entropic distances between states.

[Phys. Rev. A 112, 012203] Published Tue Jul 01, 2025

The authors show that experiments on dipolar gases in optical ladders may realize a gapless topological floating phase, characterized by incommensurate density-density correlations, which constitutes an intermediate step in the melting of a crystal to the gapped Haldane phase.

[Phys. Rev. A 112, L011301] Published Tue Jul 01, 2025

The authors present a thorough theoretical study of the acetylene molecule using the RABBIT technique for measuring photoionization time delays. They show that the presence of an additional third ionization path, opened up by the driving IR field being resonant with transitions between bound states of the cation, can strongly affect the values and physical meaning of photoionization delays extracted from fits based on the commonly used two-path interference scheme.

[Phys. Rev. A 111, 063107] Published Mon Jun 16, 2025

The authors show that Heisenberg’s uncertainty relation is modified when considered relative to a phase-space quantum reference frame, and that such a frame destroys the incompatibility of position and momentum. They recover the standard uncertainty bound by taking the classical limit of the frame, arguing that standard quantum theory relies on an implicit classical frame.

[Phys. Rev. A 111, L060201] Published Mon Jun 09, 2025

The authors investigate coherent interference effects in the quantum kicked rotor, a model of quantum chaos. They find that the signatures of these effects are unexpectedly sensitive to the initial time of observation, and reveal that this is due to a nontrivial, oscillatory background. By modeling and subtracting this background, they recover consistent contrast profiles, providing an insight into the accurate interpretation of cold atom experiments.

[Phys. Rev. A 111, 063302] Published Thu Jun 05, 2025

The authors demonstrate the generation of rubidium Bose-Einstein condensates with a repetition rate exceeding 2 Hz, utilizing forced evaporation in a dynamically adjusted optical potential. Reduced preparation times enhance data acquisition rates in scientific applications, increase the bandwidth of atomic quantum sensors, and further promote the use of BECs in high-precision atom interferometry.

[Phys. Rev. A 111, L061301] Published Tue Jun 03, 2025