We develop a framework for matrix product quantum channels, a one-dimensional tensor-network description of completely positive, trace-preserving maps. We focus on translation-invariant channels, generated by a single repeated tensor, that admit a local purification. We show that their purifying iso…

[Phys. Rev. Lett. 137, 120401] Published Wed Sep 16, 2026

Quantum many-body systems coupled to out-of-equilibrium reservoirs can behave as active matter and exhibit signs of flocking. However, the resulting steady states are highly mixed and carry only weak quantum signatures. We show that signatures of active matter also arise in ensembles of pure states …

[Phys. Rev. Lett. 137, 120403] Published Wed Sep 16, 2026

Researchers demonstrate a new quantum memory device that will enable faraway nodes in a network to coordinate in time, a key ingredient for a future quantum Internet.

[Phys. Rev. Lett. 137, 120803] Published Wed Sep 16, 2026

Estimating the properties of quantum states is a fundamental task in both theoretical and experimental quantum physics. While numerous Pauli-based measurement strategies have been proposed, none explicitly exploit prior knowledge of structural features such as symmetry. Here, we introduce a compact …

[Phys. Rev. Lett. 137, 120201] Published Tue Sep 15, 2026

Non-Hermitian physics has attracted significant interest due to its exotic phenomena. However, non-Hermitian effects at topological interfaces and their potential applications remain largely unexplored. Here, based on an interface skin-effect model, we theoretically propose a non-Hermitian topologic…

[Phys. Rev. Lett. 137, 120601] Published Tue Sep 15, 2026

We present a classical algorithm for approximating the expectation values of observables in linear optical circuits with arbitrary product input states, achieving additive-error accuracy. This result indicates that current applications of photonic systems aimed at demonstrating practical quantum adv…

[Phys. Rev. Lett. 137, 120602] Published Tue Sep 15, 2026

We introduce a high-order dynamical decoupling (DD) scheme for arbitrary bounded system-bath interactions in the weak-coupling regime. Given any decoupling group $\mathcal{G}$ that averages the interaction to zero, our construction guarantees the existence of pulse sequences with at most $(|\mathcal{G}|-1)K$ pulses, while …

[Phys. Rev. Lett. 137, 120801] Published Mon Sep 14, 2026

The quantum cryptographic conferencing (QCC) protocol, which distributes identical secure keys to user groups, is a crucial component of the quantum network. Previous experimental works have implemented the measurement-device-independent (MDI) QCC, of which the key rate in an $N$-user network scales a…

[Phys. Rev. Lett. 137, 120802] Published Mon Sep 14, 2026

The removal of heat generated during computation poses a major challenge for both classical and quantum computation and information processing. In particular, removal of this heat is intrinsically tied to one of the fundamental requirements of quantum computation—the need to reset the system to a pu…

[Phys. Rev. Lett. 137, 110404] Published Fri Sep 11, 2026

Quantum error correction (QEC) code has emerged as a powerful tool to protect quantum-enhanced metrology against noise. However, the ability to correct errors alone does not guarantee high metrological sensitivity, as the encoded states may become insensitive to the parameter of interest. Here, we s…

[Phys. Rev. Lett. 137, 110803] Published Fri Sep 11, 2026

Dynamical phase transitions in open quantum systems govern how nonequilibrium states relax toward a stationary state. We study these transitions experimentally using a discrete-time photonic quantum walk on a three-node graph. A tunable synthetic gauge flux and calibrated dephasing allow us to contr…

[Phys. Rev. Lett. 137, 110804] Published Fri Sep 11, 2026

Scaling up superconducting quantum computers requires denser control wiring, introducing microwave crosstalk along the entire cryogenic signal path rather than only near the chip. Here, we introduce a framework that combines microwave transmission-line theory with a quantum Hamiltonian description t…

[Phys. Rev. Lett. 137, 110202] Published Wed Sep 09, 2026

Multipartite entanglement is a fundamental resource for quantum information processing. Various degrees of freedom of light, such as time, frequency, and space, have been widely exploited to create large-scale entangled quantum sources, enhancing information transmission capacity. Here, we demonstra…

[Phys. Rev. Lett. 137, 110203] Published Wed Sep 09, 2026

We show that the standard approach to characterize collective entanglement via genuine multiparty entanglement (GME) leads to an area law in ground and thermal Gibbs states of local Hamiltonians. To capture the truly collective part one needs to go beyond this short-range contribution tied to interf…

[Phys. Rev. Lett. 137, 110204] Published Wed Sep 09, 2026

Recent progress in open many-body quantum systems has highlighted the importance of the Markov length, the characteristic scale over which conditional correlations decay. It has been proposed that nonequilibrium phases of matter can be defined as equivalence classes of states connected by short-time…

[Phys. Rev. Lett. 137, 110402] Published Wed Sep 09, 2026

Weak measurements have been predicted to dramatically alter universal properties of quantum critical wave functions, though experimental validation remains an open problem. Here we devise a practical scheme for realizing measurement-altered criticality in a chain of Rydberg atoms tuned to Ising and …

[Phys. Rev. Lett. 137, 110403] Published Wed Sep 09, 2026

Quantum key distribution (QKD) enables information-theoretic secure communication, yet its ultimate tolerance to noise and achievable transmission distance remain fundamentally constrained. We establish the maximum quantum bit error rate (QBER) compatible with secure QKD and derive corresponding upp…

[Phys. Rev. Lett. 137, 110801] Published Wed Sep 09, 2026

Quantum networks enable a variety of quantum information processing tasks, where multiuser quantum communication is one of the important objectives. Quantum cryptographic conferencing (QCC) serves as an essential solution to establish secure keys to realize secure multiuser communications. However, …

[Phys. Rev. Lett. 137, 110802] Published Wed Sep 09, 2026

The entanglement of quantum systems is commonly restricted by their coupling Hamiltonian and initial state properties. Here, we prove by exact analysis of tunnel-coupled bosonic field modes that factorized multiboson two-mode states can become fully entangled via stroboscopic sign flips of the two-m…

[Phys. Rev. Lett. 137, 110201] Published Tue Sep 08, 2026

Non-Hermitian systems host phenomena absent in Hermitian physics, but realizing Hamiltonians with intrinsic non-Hermitian properties remains challenging. The theoretical method of non-Hermitian parent Hamiltonian (NH-PH) enables the construction of a non-Hermitian system from a pair of matrix produc…

[Phys. Rev. Lett. 137, 110401] Published Tue Sep 08, 2026

Quantum error correction is indispensable for scalable quantum computation. Although encoding logical qubits substantially enhances noise resilience, achieving logical error rates low enough for practical algorithms remains challenging on existing hardware. Here, we introduce argument reweighting, a…

[Phys. Rev. Lett. 137, 110601] Published Tue Sep 08, 2026

We detect entanglement partitions of multipartite quantum systems by exploiting their inherent symmetries. Structures like genuinely multipartite entanglement, $m$-separability, and entanglement depth are detected as very special cases. This formulation enables us to characterize all entanglement part…

[Phys. Rev. Lett. 137, 100203] Published Fri Sep 04, 2026

Spectator leakage poses a fundamental challenge to scalable quantum computing, particularly as frequency collisions become unavoidable in multiqubit processors. We introduce a leakage mitigation strategy based on dynamically reshaping the system Hamiltonian. Our technique utilizes a tunable coupler …

[Phys. Rev. Lett. 137, 100802] Published Fri Sep 04, 2026

Robust entanglement at room temperature is a central challenge for solid-state quantum information processing and quantum-enhanced sensing. Here we demonstrate room-temperature storage of entanglement in a silicon carbide (SiC) quantum node by coherently transferring an electron-nuclear entangled st…

[Phys. Rev. Lett. 137, 100803] Published Fri Sep 04, 2026

We develop a framework for extracting nonpolynomial analytic functions of density matrices in randomized measurement experiments by a method of analytical continuation. A central advantage of this approach, dubbed stabilized analytic continuation (SAC), is its robustness to statistical noise arising…

[Phys. Rev. Lett. 137, 100202] Published Wed Sep 02, 2026

Thermal behavior in subsystems of closed quantum systems is commonly attributed to dynamical chaos, quantum ergodicity, canonical typicality, or the eigenstate thermalization hypothesis, suggesting a fundamentally statistical origin of thermalization. Here, we propose a potential alternative mechani…

[Phys. Rev. Lett. 137, 100402] Published Wed Sep 02, 2026

We characterize the causal structure of coherence transport in open bosonic systems using a two-tooth quantum comb. We show that, by mapping sequential interactions between a structured bosonic absorber and a long-lived coherent probe onto a process-tensor description, the probe functions as a tempo…

[Phys. Rev. Lett. 137, 100403] Published Wed Sep 02, 2026

We demonstrate an interspecies entangling Rydberg gate between rubidium (Rb) and cesium (Cs) atoms with fidelity $\mathcal{F}=0.975\pm 0.002$. The two-species atom array enables in-place quantum nondemolition (QND) qubit measurements which are a key capability for quantum error correction. We demonstrate this func…

[Phys. Rev. Lett. 137, 100601] Published Wed Sep 02, 2026

Quantum metrology harnesses quantum entanglement to improve measurement precision beyond the standard quantum limit. Although nonlinear interaction is essential for generating entanglement, during signal accumulation, it becomes detrimental and therefore must be suppressed. To address this challenge…

[Phys. Rev. Lett. 137, 100801] Published Wed Sep 02, 2026

We introduce many-body caging as a novel mechanism for nonthermal behavior in quantum matter. We define many-body cages as eigenstates that, through quantum interference, become localized on a subgraph of the many-body state graph. These many-body cages can lead to the formation of flat bands in the…

[Phys. Rev. Lett. 137, 100401] Published Tue Sep 01, 2026

Multipartite entanglement is a key resource for quantum technologies, yet its certification typically relies on correlations from measurements involving all particles, making it increasingly vulnerable to imperfections as the system size grows. Here we report the first experimental demonstration of …

[Phys. Rev. Lett. 137, 100201] Published Mon Aug 31, 2026

We investigate the splitting probability of a monitored continuous-time quantum walk with two targets and show that, in stark contrast to a classical random walk, it exhibits a nonanalytic, phase-transition-like behavior controlled by the sampling time at the targets. For large systems and sampling …

[Phys. Rev. Lett. 137, 090405] Published Fri Aug 28, 2026

The dynamical preparation of exotic many-body quantum states is a persistent goal of analog quantum simulation, often limited by experimental coherence times. Recently, it was shown that fast, nonadiabatic Hamiltonian parameter sweeps can create finite-size “lakes” of quantum order in certain settin…

[Phys. Rev. Lett. 137, 090802] Published Fri Aug 28, 2026

The fermion sign problem poses a formidable challenge to the use of Monte Carlo methods for lattice gauge theories with dynamical fermionic matter fields. A meron-cluster algorithm recently formulated for gauge fields represented as spin-$1/2$ quantum links coupled to a single flavor of staggered ferm…

[Phys. Rev. Lett. 137, 090404] Published Thu Aug 27, 2026

Quantum devices featuring midcircuit measurement and reset capabilities, such as quantum computers and dual-species Rydberg quantum simulators, enable the realization of quantum cellular automata. These systems evolve in discrete time following local updates implemented by unitary gates and allow fo…

[Phys. Rev. Lett. 137, 090402] Published Wed Aug 26, 2026

Shannon-Rényi and stabilizer entropies are key diagnostics of structure, “nonstabilizerness,” phase transitions, and universality in quantum many-body states. We establish an exact correspondence for quadratic fermions: for any Gaussian eigenstate, the stabilizer Rényi entropy equals the Shannon-Rén…

[Phys. Rev. Lett. 137, 090403] Published Wed Aug 26, 2026

Quantum criticality is a resource for quantum-enhanced metrology, but existing schemes face intrinsic limitations. These arise because using criticality directly in the encoding dynamics restricts the accessible parameters to those explicitly supported by the critical Hamiltonian, and the requiremen…

[Phys. Rev. Lett. 137, 090801] Published Wed Aug 26, 2026

Entanglement distribution is the overarching purpose of quantum networks. While communication over long distances can use deployed fiber infrastructure, it requires photons in the telecom band. However, advanced quantum network nodes do not operate at such wavelengths. Here we overcome this limitati…

[Phys. Rev. Lett. 137, 090803] Published Wed Aug 26, 2026

Proper characterization of quantum correlations in multimode optical quantum states is critical for applications in quantum information science. However, standard entanglement measurements can lead to incomplete state reconstruction and characterization. Here, we implement a resonator-based detectio…

[Phys. Rev. Lett. 137, 090201] Published Tue Aug 25, 2026

Recovering properties of correlation functions is typically challenging. On the one hand, experimentally, it requires measurements with a temporal resolution finer than the system’s dynamics. On the other hand, analytical or numerical analysis requires solving the system evolution. Here, we use rece…

[Phys. Rev. Lett. 137, 090401] Published Tue Aug 25, 2026

The storage of large-scale quantum information at finite temperature requires an autonomous and reliable quantum hard drive, also known as a self-correcting quantum memory. It is a long-standing open problem to find a self-correcting quantum memory in three dimensions. The recently introduced layer …

[Phys. Rev. Lett. 137, 090601] Published Tue Aug 25, 2026

Understanding the thermal behavior of quantum many-body pure states is one of the most fundamental issues in quantum thermodynamics. It is widely known that typical pure states yield vanishing work, just as thermal states do, when one restricts to local operations that cannot access correlations amo…

[Phys. Rev. Lett. 137, 080401] Published Fri Aug 21, 2026

Adiabatic ramping of both state-dependent force amplitude and motional frequency delivers high-fidelity trapped-ion entanglement without ground-state cooling.

[Phys. Rev. Lett. 137, 080602] Published Thu Aug 20, 2026

Gaussian boson sampling (GBS) is one of the leading approaches for demonstrating quantum computational advantage, but its application to practical real-world problems remains a central challenge. Here, we propose a GBS-based image recognition scheme inspired by extreme learning machine to enhance th…

[Phys. Rev. Lett. 137, 080603] Published Thu Aug 20, 2026

Researchers have demonstrated the quantum teleportation of a 100-pixel image by a method that could help to scale up quantum networks.

[Phys. Rev. Lett. 137, 080801] Published Thu Aug 20, 2026

We investigate $(k_1,k_2)$ extendibility of fermionic Gaussian states, a property central to quantum correlations and approximations of separability. We show that these states are $(k_1,k_2)$-extendible if and only if they admit a fermionic Gaussian extension, yielding a complete covariance-matrix character…

[Phys. Rev. Lett. 137, 080201] Published Tue Aug 18, 2026

We elucidate the boundary between classical and quantum computation by constructing qubit Clifford circuits with nonstabilizer inputs that can be efficiently simulated classically. We do so by casting the quantum circuits realizable by defect braiding in the surface code in terms of a Kirkwood-Dirac…

[Phys. Rev. Lett. 137, 080601] Published Tue Aug 18, 2026

While considering non-Hermitian Hamiltonians arising in the presence of dissipation, in most cases, the dissipation is taken to be frequency-independent. However, this idealization may not always be applicable in experimental settings, where dissipation can be frequency-dependent. Such frequency-dep…

[Phys. Rev. Lett. 137, 070404] Published Fri Aug 14, 2026

I propose a physical measurement scheme on multiple independent and identically distributed quantum objects to approach the Holevo-Nagaoka bound for quantum multiparameter estimation. The scheme entails a physical interaction of the objects with bosonic ancillae, followed by a general-dyne measureme…

[Phys. Rev. Lett. 137, 070804] Published Fri Aug 14, 2026

Quantum simulation is a cornerstone application of quantum computing, yet how fundamental quantum resources—entanglement and nonstabilizerness—shape simulation fidelity remains an open question. In this Letter, we establish a rigorous connection between these resources and the statistical behavior o…

[Phys. Rev. Lett. 137, 070202] Published Thu Aug 13, 2026

Using the two-dimensional random-bond Ising model as a concrete example, certain gapless ground states under quantum perturbations are shown to have a universal structure exhibiting spontaneous symmetry breaking, generalizing the classical Peierls argument for stability against thermal fluctuations.

[Phys. Rev. Lett. 137, 070405] Published Thu Aug 13, 2026

Quantum magic, quantified by nonstabilizerness, measures departures from stabilizer structure and underlies potential quantum speedups. We introduce an efficient classical framework for computing stabilizer Rényi entropies and stabilizer nullity of generic $N$-qubit wave functions. The method combines…

[Phys. Rev. Lett. 137, 070402] Published Wed Aug 12, 2026

We introduce a thermodynamic work-extraction task that describes the energy storage enhancement of quantum systems. This task induces majorizationlike conditions that provide a necessary and sufficient characterization of state conversions in general quantum resource theories. When applied to specif…

[Phys. Rev. Lett. 137, 070403] Published Wed Aug 12, 2026

Researchers propose a new way to evaluate the performance of quantum memory devices, which will be key components in a future quantum Internet.

[Phys. Rev. Lett. 137, 070802] Published Wed Aug 12, 2026

Elucidating the emergence of irreversible macroscopic laws from reversible quantum many-body dynamics remains challenging, particularly in disordered media. Here, in a doubly disordered electron-nuclear spin network in nitrogen-doped diamond, we uncover an emergent decoherence law for ${}^{13}\mathrm{C}$ polarizati…

[Phys. Rev. Lett. 137, 070803] Published Wed Aug 12, 2026

Time-translation symmetry strongly constrains physical dynamics, yet systematic characterization for continuous-variable systems lags behind its discrete-variable counterpart. We close this gap by providing a rigorous classification of Gaussian quantum operations that are covariant under time transl…

[Phys. Rev. Lett. 137, 070201] Published Tue Aug 11, 2026

In cavity quantum electrodynamics (QED), photons leaving the cavity can be irreversibly lost or reused as a power source. This dichotomy is reflected in two different thermodynamic bookkeeping methods of the light field, both corresponding to valid thermodynamic frameworks. In this Letter, we formul…

[Phys. Rev. Lett. 137, 070401] Published Tue Aug 11, 2026

Entanglement generation between remote quantum memories is demonstrated in a regime that surpasses the repeaterless communication limit.

[Phys. Rev. Lett. 137, 070801] Published Tue Aug 11, 2026

Two research teams have run small-scale demonstrations of voting protocols that could ensure election security using the principles of quantum mechanics.

[Phys. Rev. Lett. 137, 060802] Published Fri Aug 07, 2026

Two research teams have run small-scale demonstrations of voting protocols that could ensure election security using the principles of quantum mechanics.

[Phys. Rev. Lett. 137, 060803] Published Fri Aug 07, 2026

The question of thermalization in quantum many-body systems has long been studied through the properties of matrix elements of operators corresponding to local observables. More recently, the focus has shifted to the dynamics of operators, which lead to seminal works proposing universal bounds on th…

[Phys. Rev. Lett. 137, 060404] Published Thu Aug 06, 2026

We argue that the presence of any exact U(1) higher-form symmetry, under mild assumptions, presents a fundamental obstruction to ergodicity under unitary dynamics in lattice systems with local interactions and finite on-site Hilbert space dimension. Focusing on the two-dimensional case, we show that…

[Phys. Rev. Lett. 137, 060401] Published Mon Aug 03, 2026

The evolution of an isolated quantum system inevitably exhibits recurrence: the state returns to the vicinity of its initial condition after finite time. Despite its fundamental nature, a rigorous quantitative understanding of recurrence has been lacking. We establish upper bounds on the recurrence …

[Phys. Rev. Lett. 137, 060402] Published Mon Aug 03, 2026

The performance of quantum annealing for combinatorial optimization is fundamentally limited by the minimum energy gap $\mathrm{\Delta }$ encountered at quantum phase transitions. We investigate the scaling of $\mathrm{\Delta }$ with system size $N$ for two paradigmatic quantum spin-glass models: the two-dimensional Edwards-Anderson (…

[Phys. Rev. Lett. 137, 060403] Published Mon Aug 03, 2026

High-fidelity quantum gates are essential for scalable quantum computation. However, at short durations, short-timescale waveform distortions break the time-reflection symmetry of control pulses, preventing the precise closure of cyclic evolution. This mechanism renders conventional symmetric protoc…

[Phys. Rev. Lett. 137, 060601] Published Mon Aug 03, 2026

Bosonic codes constitute a promising route to fault-tolerant quantum computing. Existing Floquet protocols enable analytical construction of bosonic codes but typically rely on slow adiabatic ramps with thousands of driving periods. In this Letter, we circumvent this bottleneck by introducing an ana…

[Phys. Rev. Lett. 137, 060602] Published Mon Aug 03, 2026

We implement a decoy-state quantum key distribution scheme using a telecom C-band single-emitter source. The decoy states are created by varying the optical excitation of the quantum emitter to modulate the photon-number distribution. We provide an analysis of our scheme based on existing security p…

[Phys. Rev. Lett. 137, 060801] Published Mon Aug 03, 2026

Periodically driven quantum many-body systems exhibit a wide variety of exotic nonequilibrium phenomena and provide a promising pathway for quantum applications. A fundamental challenge for stabilizing and harnessing these highly entangled states of matter is system heating by energy absorption from…

[Phys. Rev. Lett. 137, 050407] Published Thu Jul 30, 2026

We propose and demonstrate an experimental scheme to engineer thermal baths with independently tunable temperatures and dissipation rates for the motional modes of a trapped-ion system. This approach enables robust thermal-state preparation and quantum simulations of open-system dynamics in bosonic …

[Phys. Rev. Lett. 137, 050604] Published Thu Jul 30, 2026

Stellar rank physically emerges from superselection rules and provides an interpretation to non-Gaussianity in terms of intrinsic multimode entanglement.

[Phys. Rev. Lett. 137, 050203] Published Wed Jul 29, 2026

Attempts to understand multipartite quantum nonlocality are thwarted by the difficulty of devising quantum Bell inequalities (QBI) for systems composed of more than a few separate parties. In this Letter, we introduce the notion of tight connectors, a class of tensors which, if contracted according …

[Phys. Rev. Lett. 137, 050204] Published Wed Jul 29, 2026

At lower energies, the resonances in scattering experiments are often isolated. In quantum chaotic many-body, disordered, or generically stochastic systems, the resonances overlap at larger energies. Eventually, the Ericson regime is reached in which the cross section behaves like a random function.…

[Phys. Rev. Lett. 137, 050403] Published Wed Jul 29, 2026

We revisit the Caldeira-Leggett model of quantum Brownian motion with Ohmic spectral density, and derive an additional contribution to the decoherence kernel in a new high-temperature limit at arbitrarily large cutoff frequency. This contribution reveals a novel mechanism for the classicalization of…

[Phys. Rev. Lett. 137, 050405] Published Wed Jul 29, 2026

During the charging process, interactions between a quantum battery and its charger generally generate quantum correlations, which may reduce the amount of work extractable from the battery alone. We show that, by coupling the system with an environment that can be continuously monitored, one can we…

[Phys. Rev. Lett. 137, 050406] Published Wed Jul 29, 2026

There exist pairs of orthogonal Latin squares of any order $n$ except if $n=2$ or $n=6$ [Bose et al., Further results on the construction of mutually orthogonal latin squares and the falsity of Euler’s conjecture, Can. J. Math. 12, 189 (1960)]. In particular, the problem of Euler’s thirty-six officers doe…

[Phys. Rev. Lett. 137, 050202] Published Tue Jul 28, 2026

Feedback control in open quantum dynamics is crucial for the advancement of various coherent platforms. However, currently only a handful of feedback master equations exist in the literature, which are restricted to specific types of feedback. In this letter we first introduce a unifying framework, …

[Phys. Rev. Lett. 137, 050401] Published Tue Jul 28, 2026

We prove an analog of the “bottleneck theorem,” well-known for classical Markov chains, for Markovian quantum channels. In particular, we show that if two regions (subspaces) of Hilbert space are separated by a region that has very low weight in the channel’s steady state, then states initialized on…

[Phys. Rev. Lett. 137, 050402] Published Tue Jul 28, 2026

Entanglement has been identified as a key resource for enhancing charging performance in quantum batteries. We show that the kicked-Ising model at the self-dual point provides an explicit charging mechanism, where maximal entanglement growth yields maximal energy injection. Identifying the Floquet d…

[Phys. Rev. Lett. 137, 050404] Published Tue Jul 28, 2026

Until very recently, it was generally believed that the (approximate) 2-design property is strictly stronger than anticoncentration of random quantum circuits, mainly because it was shown that the latter anticoncentrate in logarithmic depth, while the former generally need linear depth circuits. Thi…

[Phys. Rev. Lett. 137, 050601] Published Tue Jul 28, 2026

Orbital angular momentum (OAM) entanglement gives access to multiple qubit and high dimensional Hilbert spaces but is unfortunately susceptible to disturbance, decaying in real-world noisy channels. Here, we show that an underlying topology arising from OAM entanglement remains robust to such channe…

[Phys. Rev. Lett. 137, 050602] Published Tue Jul 28, 2026

The dynamics of quantum correlations are central to understanding many physical properties of quantum systems. Here we experimentally study the correlation dynamics via two-particle quantum walks in superconducting Bose-Hubbard qutrit arrays, with tunable on-site interaction $U$ realized by Floquet en…

[Phys. Rev. Lett. 137, 050603] Published Tue Jul 28, 2026

We realize a nanoscale accelerometer with a levitated nanoparticle near the ground state, exploiting its dynamical behavior triggered by the abrupt quench of its trapping potential. We find that rapid quenching provides a readout time at which the sensitivity is enhanced by 2 orders of magnitude wit…

[Phys. Rev. Lett. 137, 050801] Published Tue Jul 28, 2026

We investigate the impact of nonunique decompositions of mixed states on energy transfer. Mixed states generally have nonunique decompositions into pure states in quantum theory and, by definition, in other nonclassical probabilistic theories. We consider energy transfers constituting deterministic …

[Phys. Rev. Lett. 137, 050201] Published Mon Jul 27, 2026

Wigner negativity and genuine multipartite entanglement (GME) are key nonclassical resources that enable computational advantages and broader quantum-information tasks. In this Letter, we prove two theorems for multimode continuous-variable systems that relate these nonclassical resources. Both theo…

[Phys. Rev. Lett. 137, 040202] Published Thu Jul 23, 2026

We reveal a nontrivial crossover of subsystem fluctuations of quantum jumps in continuously monitored many-body systems, which have a trivial maximally mixed state as a steady-state density matrix. While the fluctuations exhibit the standard volume law $\propto L$ following Poissonian statistics for sufficie…

[Phys. Rev. Lett. 137, 040402] Published Thu Jul 23, 2026

Programmability is a unifying paradigm for enacting families of quantum transformations via fixed processors and program states, with a fundamental role and broad impact in quantum computation and control. While there has been a shift from viewing open systems solely as a source of error to treating…

[Phys. Rev. Lett. 137, 040403] Published Thu Jul 23, 2026

By implementing a quantum neural network using two quantum-computing platforms, researchers have taken steps toward determining whether such systems can reliably fulfill their theoretical promise.

[Phys. Rev. Lett. 137, 040601] Published Wed Jul 22, 2026

Integrating semiconducting and magnetic materials could combine transistorlike operation with nonvolatility and enable architectures such as logic in memory. Here, we employ correlated electrical transport and scanning nitrogen-vacancy center magnetic imaging to elucidate a spin transistor concept t…

[Phys. Rev. Lett. 137, 040802] Published Wed Jul 22, 2026

The generation of entangled photons through spontaneous parametric down-conversion (SPDC) is a critical resource for many key experiments and technologies in the domain of quantum optics. Historically, SPDC was limited to the generation of photon pairs. However, the use of the strong nonlinearities …

[Phys. Rev. Lett. 137, 040201] Published Tue Jul 21, 2026

Ultracold alkaline-earth atoms and molecules now enable experimental realizations of SU(N)-symmetric Fermi-Hubbard models, yet theoretical understanding of these systems, particularly at finite doping remains limited. Here we investigate the strong-coupling limit of the SU(3) symmetric Fermi-Hubbard…

[Phys. Rev. Lett. 137, 040401] Published Tue Jul 21, 2026

Quantum metrology promises to surpass classical precision limits by leveraging quantum resources such as entanglement. Maximally entangled Greenberger-Horne-Zeilinger (GHZ) states are theoretically optimal probes for quantum metrology. However, they are fragile to environmental noise, severely limit…

[Phys. Rev. Lett. 137, 040801] Published Mon Jul 20, 2026

For a class of translation-invariant free-fermion systems including those with uniform nearest-neighbor hopping) on a $d$-dimensional $L\times \cdots \times L$ hypercubic lattice, we prove that, starting from an arbitrary pure initial state, the system equilibrates with respect to the coarse-grained density within a time…

[Phys. Rev. Lett. 137, 030406] Published Fri Jul 17, 2026

The interplay between external gauge fields and lattice geometry can induce extreme localization dynamics through complete destructive interference. We show that combining this flux-induced localization with engineered dissipation leads to robust spin synchronization in rotationally symmetric spin g…

[Phys. Rev. Lett. 137, 030405] Published Thu Jul 16, 2026

Non-Markovian noise, arising from environmental memory effects, is the most general and challenging form of noise in quantum computing, and is typically difficult to characterize and suppress. Here, we analyze and experimentally demonstrate a non-Markovian noise suppression scheme inspired by quantu…

[Phys. Rev. Lett. 137, 030601] Published Thu Jul 16, 2026

Device-independent (DI) certification allows the verification of quantum systems based solely on observed statistics, without assumptions about their internal structure. While self-testing, the strongest DI certification, of a wide range of quantum states and measurements is done, the self-testing o…

[Phys. Rev. Lett. 137, 030802] Published Wed Jul 15, 2026

The principle that heat spontaneously flows from higher temperatures to lower temperatures is a cornerstone of classical thermodynamics. While this principle holds true for macroscopic systems at equilibrium, here we show that, when a quantum system undergoes two thermalization processes in an indef…

[Phys. Rev. Lett. 137, 030404] Published Tue Jul 14, 2026

Under unitary evolution, chaotic quantum systems initialized in simple states rapidly develop high complexity, precluding any efficient classical description. The hardness of classical simulation within the stabilizer formalism, commonly referred to as magic resources, can be quantified by the stabi…

[Phys. Rev. Lett. 137, 030401] Published Mon Jul 13, 2026

We introduce a simplified version of Connes-Narnhofer-Thirring’s quantum dynamical entropy for quantum systems. It quantifies the amount of information gained about the initial condition from continuously monitoring an observable. A nonzero entropy growth rate can be obtained by monitoring the therm…

[Phys. Rev. Lett. 137, 030402] Published Mon Jul 13, 2026

Thermal operations are quantum channels that play a central role in deriving thermodynamic limitations in quantum systems. However, they were originally defined by implementation procedures rather than by fundamental principles. Alternative models of thermal processes have been proposed, but they ob…

[Phys. Rev. Lett. 137, 030403] Published Mon Jul 13, 2026

Although entanglement can boost metrological precision beyond the standard quantum limit, the advantage often disappears with particle loss. We demonstrate that scrambling safeguards precision by dispersing information about the encoded parameter into many-body correlations. For Haar-random scrambli…

[Phys. Rev. Lett. 137, 030801] Published Mon Jul 13, 2026