We present a quantum thermometry scheme based on a cavity-QED setup, which attains a sensitivity with Heisenberg scaling. A stream of identical two-level systems passes through a thermal bath to be tested. Each system partially thermalizes, carrying information on the temperature of the thermal bath…

[Phys. Rev. A 101, 063844] Published Tue Jun 30, 2020

Biphotons of narrow bandwidth and long temporal length play a crucial role in long-distance quantum communication (LDQC) and linear optical quantum computing (LOQC). However, generation of these photons usually requires atomic ensembles with high optical depth or spontaneous parametric down-conversi…

[Phys. Rev. A 101, 063837] Published Mon Jun 29, 2020

The hybrid microwave optomechanical-magnetic system has recently emerged as a promising candidate for coherent information processing because of the ultrastrong microwave photon-magnon coupling and the long life of the magnon and phonon. As a quantum information processing device, the realization of…

[Phys. Rev. A 101, 063838] Published Mon Jun 29, 2020

We investigate corner states in a photonic two-dimensional (2D) Su-Schrieffer-Heeger (SSH) model on a square lattice with zero gauge flux. By considering intracelluar next-nearest-neighbor (NNN) hoppings, we discover a broad class of corner states in the 2D SSH model and show that they are robust ag…

[Phys. Rev. A 101, 063839] Published Mon Jun 29, 2020

We study the hardness of classically simulating boson sampling with superposition and Gaussian input states at nonzero photon indistinguishability. We find that, similar to regular boson sampling, distinguishability causes exponential attenuation of the many-photon interference terms in both these b…

[Phys. Rev. A 101, 063840] Published Mon Jun 29, 2020

Strong correlations between the signal and idler beams imprinted during their generation dominantly determine the properties of twin beams. They are also responsible for the waves in intensity coherence observed in the wave-vector space of a twin beam propagating in a nonlinear crystal in the regime…

[Phys. Rev. A 101, 063841] Published Mon Jun 29, 2020

An experimental technique, traditionally used to probe space-time correlations in the classical domain, is made more broadly applicable in the quantum regime. The authors extend their previous work based on single photons to the limit of weak coherent states, therefore providing a method better suited to describe actual experimental realizations.

[Phys. Rev. A 101, 063842] Published Mon Jun 29, 2020

We explore the quantum criticality of a two-site model combining quantum Rabi models with hopping interaction. Through a combination of analytical and numerical approaches, we find that the model allows the appearance of a superradiant quantum phase transition (QPT) even in the presence of strong ${\mathbf{A}}^2$…

[Phys. Rev. A 101, 063843] Published Mon Jun 29, 2020

Two mutually exclusive characteristics of traditional optomechanical systems based on bulk mirrors or membranes are combined: The ability to strongly scatter light and the one to attain very large mechanical susceptibility. The proposed platform, a two-dimensional atomic array, exhibits rich multimode phenomena and the reported results suggest that the regime of few-photon quantum optomechanics is closer to reach.

[Phys. Rev. A 101, 063833] Published Fri Jun 26, 2020

In this paper, we propose a feasible scheme for generating the Schrödinger-cat-like states of a macroscopic mechanical resonator in pulsed cavity optomechanics via photon detection. Starting with cooling the mechanical oscillator to its ground state, a red pulse and a blue pulse with different power…

[Phys. Rev. A 101, 063834] Published Fri Jun 26, 2020

Photon statistical measurements on a semiconductor microlaser, obtained using single-photon counting techniques, show that a newly discovered spontaneous pulsed emission regime possesses superthermal statistical properties. The observed spike dynamics, typical of small-scale devices, is at the origi…

[Phys. Rev. A 101, 063835] Published Fri Jun 26, 2020

We propose an optomechanical dissipation engineering scheme by introducing an ancillary mechanical mode with a large decay rate to control the density of states of the optical mode. The effective linewidth of the optical mode can be reduced or broadened, manifesting the dissipation engineering. To p…

[Phys. Rev. A 101, 063836] Published Fri Jun 26, 2020

The polaron picture is employed to investigate and elucidate the physics of the two-qubit quantum Rabi model, which describes two identical qubits coupled to a common harmonic oscillator. This approach enables us to obtain the ground-state energy and some other simpler physical observables with high…

[Phys. Rev. A 101, 063832] Published Thu Jun 25, 2020

One of the most intriguing topological features of open systems is that they exhibit exceptional point (EP) singularities. Apart from the widely explored second-order EPs (EP2s), the exploration of higher-order EPs in any system requires more complex topology, which is still a challenge. Here, we en…

[Phys. Rev. A 101, 063829] Published Wed Jun 24, 2020

Sorting spatial optical modes is a key challenge that underpins many applications from superresolved imaging to high-dimensional quantum key distribution. However, to date, implementations of optical mode sorters only operate on specific sets of modes, such as those carrying orbital angular momentum…

[Phys. Rev. A 101, 063830] Published Wed Jun 24, 2020

The single-photon cooperative dynamics of an assembly of two-level quantum emitters coupled by a bosonic bath is investigated. The bosonic bath is general and can be anything as long as the exchange of excitations between quantum emitters and bath is present. In these systems it is found that the po…

[Phys. Rev. A 101, 063831] Published Wed Jun 24, 2020

We study the formation of off-axis optical vortices propagating inside a double-Raman gain atomic medium. The atoms interact with two weak probe fields as well as two strong pump beams which can carry orbital angular momentum (OAM). We consider a situation when only one of the strong pump lasers car…

[Phys. Rev. A 101, 063828] Published Mon Jun 22, 2020

High-resolution field localization in three dimensions is one of the main challenges in optics and has immense importance in fields such as chemistry, biology, and medicine. Time-reversal symmetry of waves has been a fertile ground for applications such as generating a subwavelength focal spot and c…

[Phys. Rev. A 101, 063818] Published Fri Jun 19, 2020

We systematically study different scenarios of interaction between two localized structures which were both found recently in interfaced binary waveguide arrays with alternating signs of the Dirac mass in the linear and nonlinear regimes of Kerr type. The first localized structure is the optical ana…

[Phys. Rev. A 101, 063826] Published Fri Jun 19, 2020

We present a general theory for optical imaging of moving objects obscured by heavily scattering random media. Measurements involve collecting a series of speckle intensity images as a function of the position of a moving object. A statistical average intensity correlation can be formed with the pot…

[Phys. Rev. A 101, 063827] Published Fri Jun 19, 2020

Photon correlations, as measured by Glauber's $n\mathrm{th}$-order coherence functions $g^{\left(n\right)}$, are highly sought to be minimized and/or maximized. In systems that are coherently driven, so-called blockades can give rise to strong correlations according to two scenarios based on level repulsion (conventional bloc…

[Phys. Rev. A 101, 063824] Published Thu Jun 18, 2020

Spectral collapse, the transition from a discrete to a continuous spectrum, is a characteristic in quantum Rabi models. We explore this phenomenon in the two-photon quantum Rabi model using optical phase space, and we find that, in the so-called degenerate qubit regime, the collapse is similar to th…

[Phys. Rev. A 101, 063825] Published Thu Jun 18, 2020

An important step for photonic quantum technologies is the demonstration of a quantum advantage through boson sampling. In order to prevent classical simulability of boson sampling, the photons need to be almost perfectly identical and almost without losses. These two requirements are connected thro…

[Phys. Rev. A 101, 063821] Published Wed Jun 17, 2020

We study coherent perfect absorption (CPA) theoretically based on a weakly coupled atom-cavity system with an optically pumped second-order nonlinear crystal (SOC) embedded in the cavity. Our system does not require a strong coupling, which is often needed for CPA in previous studies but is challeng…

[Phys. Rev. A 101, 063822] Published Wed Jun 17, 2020

Recently a type of robust exceptional point was found that is insensitive to the coupling disorder in the bulk. Here we show that a disparity emerges when the number of coupled optical cavities in this one-dimensional array changes from even to odd. The robust exceptional point only exists in the fo…

[Phys. Rev. A 101, 063823] Published Wed Jun 17, 2020

We propose an experimental protocol to realize discrete-variable quantum teleportation using optomechanical devices. The photonic polarization superposition state of a single photon is teleported to a phononic superposition of two micromechanical oscillators by means of photon-phonon entanglement ge…

[Phys. Rev. A 101, 063820] Published Tue Jun 16, 2020

We study the formation of localized patterns arising in doubly resonant dispersive optical parametric oscillators. They form through the locking of fronts connecting a continuous-wave and a Turing pattern state. This type of localized state can be seen as a slug of the pattern embedded in a homogene…

[Phys. Rev. A 101, 063817] Published Mon Jun 15, 2020

After reviewing the pioneering work by Zel'Dovich in which radiation is amplified perpendicular to the axis of a rotating conductor, we consider an alternative scattering arrangement. We demonstrate superradiant amplification of electromagnetic waves with orbital angular momentum directed axially to…

[Phys. Rev. A 101, 063819] Published Mon Jun 15, 2020

We study the interaction between a single two-level atom and a quantized single-photon probe pulse in a guided mode of a nanofiber. We examine the situation of chiral interaction, where the atom has a dipole rotating in the meridional plane of the nanofiber and the probe pulse is quasilinearly polar…

[Phys. Rev. A 101, 063816] Published Thu Jun 11, 2020

In a sequence of single spins interacting longitudinally with a mechanical oscillator, and using the micromaser model with random injection, we show that after an appropriate postselection of each spin, a phonon laser analog with Poisson statistics is created with nearly perfect coherence, evidenced…

[Phys. Rev. A 101, 063815] Published Tue Jun 09, 2020

A theoretical consideration of the so-called “membrane-in-the-middle” optomechanical cavity revealed that it undergoes a spontaneous symmetry breaking as a function of transparency of the membrane. Such typical features of this phenomenon as a square-root development of the order parameter and diver…

[Phys. Rev. A 101, 063813] Published Mon Jun 08, 2020

We demonstrate the emergence of transparent behavior in a chain of periodically spaced nonidentical quantum emitters coupled to a waveguide, in the special case when the nearest neighbor separation is a half-integral multiple of the resonant wavelength, i.e., $kL$ is an integral multiple of $\pi$, with $k$ …

[Phys. Rev. A 101, 063814] Published Mon Jun 08, 2020

We study the optical stress and deformation of a dielectric sphere by an arbitrary shaped electromagnetic beam. The incident optical beam is described within the framework of generalized Lorenz-Mie theory (GLMT). A model based on the stress balance across a static fluid interface is used to determin…

[Phys. Rev. A 101, 063812] Published Fri Jun 05, 2020

In recent years, several works have demonstrated the advantage of photon-subtracted Gaussian states for various quantum optics and information protocols. In most of these works, the relation between the advantages and the usual increasing energy of the quantum state related to photon subtraction was…

[Phys. Rev. A 101, 063810] Published Thu Jun 04, 2020

We study the interaction of laser pulses carrying orbital angular momentum (OAM) with structural asymmetry quantum-dot molecules characterized by four energy levels. We demonstrate how the interdot tunneling endows exchange of optical vortices between different frequencies. We consider a case where …

[Phys. Rev. A 101, 063811] Published Thu Jun 04, 2020

We present a theoretical study of Fano interference effects in few-photon transport. Under appropriate conditions, a local defect in an optical waveguide induces a highly asymmetric transmission line shape, characteristic of Fano interference. For a two-level emitter placed adjacent to such a defect…

[Phys. Rev. A 101, 063809] Published Wed Jun 03, 2020

Optical orbital angular momentum transformation and corresponding azimuthal-mode selection rules have been studied exhaustively for various nonlinear optical interactions. However, nonlinear transformation of the radial mode has not been systematically studied since the pioneering work [Phys. Rev. A…

[Phys. Rev. A 101, 063805] Published Tue Jun 02, 2020

When a laser beam passes through a rotating ground glass (RGG), the scattered light exhibits thermal statistics. This is extensively used in speckle imaging. This scattering process has not been addressed in the photon picture and is especially relevant if nonclassical light is scattered by the RGG.…

[Phys. Rev. A 101, 063806] Published Tue Jun 02, 2020

We present detailed studies on dark-bright vector solitons formed in dispersion- and birefringence-managed fiber lasers sustained by either incoherent or coherent cross-polarization coupling. We show that even under strong influence of the gain bandwidth limitation, coupled dark-bright solitons can …

[Phys. Rev. A 101, 063807] Published Tue Jun 02, 2020

Wave-chaotic systems underpin a wide range of research activities from fundamental studies of quantum chaos via electromagnetic compatibility up to more recently emerging applications, such as microwave imaging for security screening, antenna characterization, or wave-based analog computation. To im…

[Phys. Rev. A 101, 061801(R)] Published Mon Jun 01, 2020

In this paper we study the propagation of optical vortices (OVs) through the loop resonator (LR) on a multimode fiber. Within the framework of a fully vectorial treatment that allows for the spin-orbit interaction (SOI) we demonstrate the existence in such LRs of a special topological resonance, whi…

[Phys. Rev. A 101, 063801] Published Mon Jun 01, 2020

Ultrastrong optomechanical interaction is a significant element for the study of the fundamentals and applications of optomechanical physics, but its realization remains a big challenge in the field of optomechanics. In this work, we propose a reliable scheme to realize a generalized ultrastrong opt…

[Phys. Rev. A 101, 063802] Published Mon Jun 01, 2020

In any form of wave propagation, strong spatiotemporal coupling appears when nonelementary three-dimensional wave packets are composed by superimposing pure plane waves or spontaneously generated by light-matter interaction and nonlinear processes. Ultrashort pulses with orbital angular momentum (OA…

[Phys. Rev. A 101, 063803] Published Mon Jun 01, 2020

We propose to explore the quantum nature of gravity using the correlation of light between two optomechanical cavities, and the quantumness of the correlation is witnessed by squeezing. As long as the gravity between the end mirrors of two cavities is quantum in the Newtonian limit, we show that the…

[Phys. Rev. A 101, 063804] Published Mon Jun 01, 2020

We investigate optimal conditions for the quantum interface between a signal photon pulse and one-dimensional chain consisting of a varied number of atoms. The tested object is physically designed as an atomic array of tripod-type atoms confined with a nanoscale dielectric waveguide and experiencing…

[Phys. Rev. A 101, 053858] Published Fri May 29, 2020

The realization of advanced materials with strong, low-loss, and pure magnetic responses to radiation fields both in linear and nonlinear regimes is an important and long-standing goal for fundamental physics and practical applications. Here, we propose a physical scheme for obtaining such responses…

[Phys. Rev. A 101, 053859] Published Fri May 29, 2020

We present a generalized understanding of the induced-coherence (IC) effect, aiming to find new strategies for engineering and optimizing the IC response of nonlinear systems. We establish that sensing the cross density of states (CDOS) of the field lies at the core of IC and that it is the spatial …

[Phys. Rev. A 101, 053860] Published Fri May 29, 2020

A chiral network scheme is modified by the addition of microcavities leading to the prediction of a boost in concurrence. The protocol is expected to be robust against experimental imperfections and can be implemented in state-of-the-art integrated photonic platforms.

[Phys. Rev. A 101, 053861] Published Fri May 29, 2020

We analyze the dynamics of a one-dimensional vertical Fabry-Pérot cavity, where the upper mirror levitates due to intracavity radiation pressure force. A perturbative approach is used based around separation of timescales, which allows us to calculate the physical quantities of interest. Due to the …

[Phys. Rev. A 101, 053857] Published Wed May 27, 2020

A general analytic form of the full $6\times 6$ dyadic Green's function of a spherically symmetric open optical system is presented, with an explicit solution provided for a homogeneous sphere in vacuum. Different spectral representations of the Green's function are derived using the Mittag-Leffler theorem,…

[Phys. Rev. A 101, 053854] Published Tue May 26, 2020

In this paper, we investigate the single-photon scattering and bound states in a one-dimensional coupled-resonator waveguide which couples to a single artificial giant atom with two or more coupling points. When the atom couples to the waveguide via two resonators, the single-photon reflection rate …

[Phys. Rev. A 101, 053855] Published Tue May 26, 2020

We investigate a four-level tripod atomic sample trapped, respectively, in a one-dimensional order and disorder (atom number fluctuation) optical lattice to achieve the tunable and robust three-color reflections in the regimes of zero absorption. Based on electromagnetically induced transparency (EI…

[Phys. Rev. A 101, 053856] Published Tue May 26, 2020

The theory of the thin-vapor-layer linear optical properties is presented for the case of specular reflection of atoms colliding with the walls. The effects of light absorption and the shift in the resonance frequency are taken into account by means of self-consistent calculation of the field and po…

[Phys. Rev. A 101, 053850] Published Fri May 22, 2020

We theoretically demonstrate intermittent chaos induced by radiation-pressure nonlinearity in a general optomechanical system. In contrast to the periodic and chaotic dynamics, this optomechanical intermittent chaos is characterized by a nearly periodic motion interrupted irregularly by the chaotic …

[Phys. Rev. A 101, 053851] Published Fri May 22, 2020

Spontaneous decay of an excited atom in a waveguide is essentially modified by the spatial structure of a vacuum reservoir. This is particularly exciting in view of a range of applications for quantum information science. We found out that spontaneous decay can be incomplete, so the time dependence …

[Phys. Rev. A 101, 053852] Published Fri May 22, 2020

We study the distinguishability of photons in multiphoton interference on a multiport when fast detectors, capable of precise time resolution, are employed. Such a setup was previously suggested for experimental realization of boson sampling with single photons. We investigate if fast photodetection…

[Phys. Rev. A 101, 053853] Published Fri May 22, 2020

We address the consequences of back action in the unidirectional coupling of two cascaded open quantum subsystems connected to the same reservoir at different spatial locations. In the spirit of H. J. Carmichael [Phys. Rev. Lett. 70, 2273 (1993)], the second subsystem is a two-level atom, while the …

[Phys. Rev. A 101, 053849] Published Thu May 21, 2020

We study light scattering by systems combining randomly rough surface and volume dielectric fluctuations. We introduce a general model including correlations between surface and volume disorders, and we study the scattering properties within a single-scattering approach. We identify different regime…

[Phys. Rev. A 101, 053847] Published Wed May 20, 2020

When a gas of ultracold atoms is suddenly illuminated by light that is nearly resonant with an atomic transition, the atoms cannot respond instantaneously. This noninstantaneous response means the gas is initially more transparent to the applied light than in steady state. The timescale associated w…

[Phys. Rev. A 101, 053848] Published Wed May 20, 2020

Quantum reflection refers to a nonvanishing reflection probability in the absence of a classically turning point. Much attention has been paid to such reflections due to their fundamental, intriguing physics and potential practical applications. Here we propose a scheme to realize a quantum reflecti…

[Phys. Rev. A 101, 053845] Published Tue May 19, 2020

Recent experiments have demonstrated the feasibility of exploiting spectral singularities in open quantum and wave systems, so-called exceptional points, for sensors with strongly enhanced response. Here, we study theoretically the influence of classical parametric noise on the performance of such s…

[Phys. Rev. A 101, 053846] Published Tue May 19, 2020

A nonlinear medium with nonreciprocal propagation of electromagnetic field pulses is proposed and studied. The medium consists of a long waveguide surrounded by two-level media implanted in a straight spiral. Respective Maxwell-Bloch system describing evolution of the pulses in the waveguide with no…

[Phys. Rev. A 101, 053837] Published Mon May 18, 2020

We achieve interface states with a high reflectance in photonic heterostructures composed of two kinds of all-dielectric one-dimensional photonic crystals (1DPCs) with symmetric unit cells. The reflectance of interface states can be controlled flexibly by tuning the mismatch degree between the imagi…

[Phys. Rev. A 101, 053838] Published Mon May 18, 2020

Whispering gallery modes (WGMs), circulating modes near the surface of a spheroidal material, have been known to exhibit high-quality factors for both acoustic and electromagnetic waves. Here, we report an electro-optomechanical system, where the overlapping WGMs of acoustic and optical waves along …

[Phys. Rev. A 101, 053839] Published Mon May 18, 2020

One of the most direct preparations of a Gottesman-Kitaev-Preskill (GKP) qubit in an oscillator uses a tunable photon-pressure (also called optomechanical) coupling of the form $\widehat{q}{\widehat{b}}^{†}\widehat{b}$, enabling us to imprint the modular value of the position $\widehat{q}$ of one oscillator onto the state of an ancilla oscilla…

[Phys. Rev. A 101, 053840] Published Mon May 18, 2020

We study the quantum state of twin photons generated by parametric down-conversion in a two-dimensional nonlinear photonic crystal, driven by a dual pump beam. The interplay between the grating of the ${\chi }^{\left(2\right)}$ nonlinear response and the transverse spatial modulation of the pump opens a rich scenario of …

[Phys. Rev. A 101, 053841] Published Mon May 18, 2020

Exceptional points (EPs) in the optical whispering-gallery-mode (WGM) microcavity perturbed by Rayleigh scatterers have shown great potential in the areas of on-chip chiral photonics and enhanced sensors, creating a huge demand for deep theoretical insight into the unique physical properties of EPs.…

[Phys. Rev. A 101, 053842] Published Mon May 18, 2020

The possibility to manage and control spectral and spatial properties of optical-terahertz nonclassical fields generated in strongly nondegenerate parametric down-conversion is demonstrated experimentally using Mach-Zehnder nonlinear interferometer and analyzed theoretically in terms of Schmidt mode…

[Phys. Rev. A 101, 053843] Published Mon May 18, 2020

Ghost imaging is demonstrated using a polyenergetic reactor source of thermal neutrons. This enables position resolution to be incorporated into a variety of neutron instruments that are not position resolving. Such a proof of concept enables several further applications. For example, in an imaging …

[Phys. Rev. A 101, 053844] Published Mon May 18, 2020

$X$ waves are a special type of wave packet that can maintain their transverse profile of $X$ shape during propagation, and they are of much interest for the study of fundamental physics and practical applications. Here we present a scheme to generate nonlinear $X$ waves and realize their active control b…

[Phys. Rev. A 101, 053832] Published Fri May 15, 2020

A pertinent question in cavity optomechanics is whether reaching the regime of large single-photon cooperativity, where the single-photon coupling rate exceeds the geometric mean of the cavity and mechanical decay rates, can enable any new phenomena. We show that in some multimode optomechanical sys…

[Phys. Rev. A 101, 053833] Published Fri May 15, 2020

Multipartite Einstein-Podolsky-Rosen (EPR) steering has been recognized as an essential resource for secure quantum communication tasks composed of several spatially separated parties who cannot be fully trusted. Nevertheless, this resource cannot be distributed arbitrarily over many parties; for in…

[Phys. Rev. A 101, 053834] Published Fri May 15, 2020

An apparatus that uses optically levitated objects, together with active feedback cooling, is used to provide an order-of-magnitude improvement on the sensitivity of state-of-the-art accelerometers. The results pave the way to using such sensors as a part of large-scale particle detectors, for assessing the neutrality of matter and dark matter, and for studying short-ranged Yukawa forces.

[Phys. Rev. A 101, 053835] Published Fri May 15, 2020

We propose a simple yet surprisingly effective mechanical squeezing scheme in a standard optomechanical system that is beneficial for the amplitude modulation of the pump laser. By merely introducing a specific kind of periodic modulation into the single-tone driving field to cool down the mechanica…

[Phys. Rev. A 101, 053836] Published Fri May 15, 2020

We develop a multiple-scattering theory for the absorption of waves in disordered media. Based on a general expression of the average absorbed power, we discuss the possibility of maximizing absorption by using structural correlations of disorder as a degree of freedom. In a model system made of abs…

[Phys. Rev. A 101, 053829] Published Thu May 14, 2020

We present the Cartesian multipole expansion theory for computing the optical force acting on a spherical chiral particle immersed in generic monochromatic optical fields. The theory enables us to develop the general formulations for individually calculating the optical gradient and scattering force…

[Phys. Rev. A 101, 053830] Published Thu May 14, 2020

Recently, synthetic chiral light was introduced and theoretically shown to be highly effective for chiral light-matter interactions [D. Ayuso, O. Neufeld, A. F. Ordonez, P. Decleva, G. Lerner, O. Cohen, M. Ivanov, and O. Smirnova, Nat. Photonics 13, 866 (2019)]. This electromagnetic (EM) field posse…

[Phys. Rev. A 101, 053831] Published Thu May 14, 2020

We study electromagnetic pulse propagation in an indium tin oxide nanolayer in the linear and nonlinear regimes. We use the constitutive relations to reconstruct the effective dielectric constant of the medium, and show that nonlocal effects induce additional absorption resonances and anisotropic di…

[Phys. Rev. A 101, 053828] Published Wed May 13, 2020

We propose a scheme to enhance the light-matter coupling in a cavity QED system where two $\mathrm{\Lambda }$ atoms are weakly coupled to a single-mode cavity via multiphoton interaction. By introducing a second-order nonlinear (parametric) driving of the cavity, the original $N$-photon exchanges between the atoms, and…

[Phys. Rev. A 101, 053826] Published Tue May 12, 2020

We provide the classification of possible wave structures evolving from initially discontinuous profiles for the photon fluid propagating in a normal dispersion fiber. The dynamics of light fields is described by the generalized Chen-Lee-Liu equation, which belongs to the family of the nonlinear Sch…

[Phys. Rev. A 101, 053827] Published Tue May 12, 2020

Characterizing high-dimensional entangled states is of crucial importance in quantum information science and technology. Recent theoretical progress has been made to extend Hardy's paradox into a general scenario with multisetting and multidimensional systems, which enables the maximum probability o…

[Phys. Rev. A 101, 053821] Published Mon May 11, 2020

We study the generation of frequency nondegenerate correlated photon pairs and heralded single photons via spontaneous four-wave mixing (SFWM) in a series of identical micro- or nanofibers (MNFs). Joint spectral intensity of the biphoton field generated at wavelengths of about 880 and 1310 nm has be…

[Phys. Rev. A 101, 053822] Published Mon May 11, 2020

We study the dynamics of the center of mass of a Brownian particle levitated in a Paul trap. We mostly focus on the overdamped regime in the context of levitodynamics, comparing theory with numerical simulations and experimental data from our Paul trap. We provide an exact analytical solution to the…

[Phys. Rev. A 101, 053823] Published Mon May 11, 2020

A bright beam of metastable helium atoms is useful in various studies. Laser spectroscopy of helium in an atomic beam can provide a determination of the fine-structure constant and the nuclear charge radius, towards a test of quantum electrodynamics (QED). In these measurements, it is necessary to c…

[Phys. Rev. A 101, 053824] Published Mon May 11, 2020

Polarimetric dimension and nonregularity are newly introduced concepts that characterize three-dimensional (3D) polarization states of light. We analyze the spectral polarimetric dimension and the degree of nonregularity associated with two kinds of tightly focused beams: a radially fully polarized …

[Phys. Rev. A 101, 053825] Published Mon May 11, 2020

In non-Hermitian systems, multiple eigenstates can merge into one state at so-called exceptional points (EPs). This paper presents the coalescence of the multiple EPs based on a waveguide. For the ring cavities located at the second-order EPs with desired chiral modes, the waveguide provides unidire…

[Phys. Rev. A 101, 053820] Published Fri May 08, 2020

We investigate the photon statistics of the light transmitted by a dipolariton system in interaction with a squeezed light from a degenerate optical parametric oscillator. We show that the presence of the squeezed photons in the cavity considerably increases the excitonic intensities and leads to a …

[Phys. Rev. A 101, 053819] Published Thu May 07, 2020

Estimating the quality of a single-photon source is crucial for its use in quantum technologies. The standard test for semiconductor sources is a value of the second-order correlation function of the emitted field below $1/2$ at zero time delay. This criterion alone provides no information regarding t…

[Phys. Rev. A 101, 053815] Published Wed May 06, 2020

The scattering of partially coherent radiation by a localized continuous material having parity-time ($\mathcal{PT}$) symmetry is considered under the formalism of classical coherence theory and the assumption that the Born approximation is valid. Our results suggest that the correlation-induced spectral change…

[Phys. Rev. A 101, 053817] Published Wed May 06, 2020

It has been shown elsewhere that two spatially separated atoms can jointly absorb one photon, whose frequency is equal to the sum of the transition frequencies of the two atoms. We describe this process in the presence of an ensemble of many two-level atoms and show that it can be used to generate s…

[Phys. Rev. A 101, 053818] Published Wed May 06, 2020

A method for the production of intense circularly polarized (CP) attosecond pulses from relativistic laser-solid interactions is proposed, where a two-color linearly polarized (LP) laser is used. The polarization, photon frequency, and other properties of the obtained attosecond pulse can be control…

[Phys. Rev. A 101, 053814] Published Tue May 05, 2020

We design a framework based on the spatial-domain copropagation of two light beams with mutually orthogonal polarizations and opposite transverse components of carrier wave vectors in a nonlinear waveguide with randomly varying birefringence, the averaging with respect to which introduces an effecti…

[Phys. Rev. A 101, 053816] Published Tue May 05, 2020

We find that a suppression of the collapse and revival of population inversion occurs in response to insertion of Gaussian quenched disorder in atom-cavity interaction strength in the Jaynes-Cummings model. The character of suppression can be significantly different in the presence of non-Gaussian d…

[Phys. Rev. A 101, 053805] Published Mon May 04, 2020

The evenly spaced modes of an electromagnetic resonator are coupled to each other by appropriate time modulation, leading to dynamics analogous to those of particles hopping between different sites of a lattice. This substitution of a real spatial dimension of a lattice with a “synthetic” dimension …

[Phys. Rev. A 101, 053807] Published Mon May 04, 2020

In this work we investigate quantum-enhanced target detection in the presence of large background noise using multidimensional quantum correlations between photon pairs generated through spontaneous parametric down-conversion. Until now similar experiments have only utilized one of the photon pairs'…

[Phys. Rev. A 101, 053808] Published Mon May 04, 2020

Many physical systems exhibit marginally unstable periodic orbits, which are nonhyperbolic families of periodic orbits appearing as segmented line structures with zero Lebesgue measure coexisting with hyperbolic components in phase space. Orbits in their vicinity escape in a subexponential manner wh…

[Phys. Rev. A 101, 053809] Published Mon May 04, 2020

We study conditions for the generation of strongly correlated photons of two extremely different frequency ranges, optical and terahertz, via the spontaneous parametric down-conversion effect in a nonlinear medium. Analytical expressions for the correlation function are derived using equations of th…

[Phys. Rev. A 101, 053810] Published Mon May 04, 2020

We present a simple extension of the semiclassical model for a two-level system in a cavity, in order to incorporate multiple polarized transitions, such as those appearing in neutral and charged quantum dots (QDs), and two nondegenerate linearly polarized cavity modes. We verify the model by exact …

[Phys. Rev. A 101, 053811] Published Mon May 04, 2020

We explore amplification and cross-Kerr nonlinearity by a three-level emitter (3LE) embedded in a waveguide and driven by two light beams. The coherent amplification and cross-Kerr nonlinearity were demonstrated in recent experiments, respectively, with a $\mathsf{V}$ and a ladder-type 3LE coupled to an open s…

[Phys. Rev. A 101, 053812] Published Mon May 04, 2020

Based on the concepts of quantum synchronization and quantum phase synchronization proposed by A. Mari et al. [Phys. Rev. Lett. 111, 103605 (2013)], we introduce and characterize the measure of a more generalized quantum synchronization called quantum $\varphi$ synchronization under which pairs of variables…

[Phys. Rev. A 101, 053813] Published Mon May 04, 2020