We provide a general protocol to measure out-of-time-order correlation functions. These correlation functions are of broad theoretical interest for diagnosing the scrambling of quantum information in interacting quantum systems and have recently received particular attention in the study of chaos an…

[Phys. Rev. A 94, 040302(R)] Published Tue Oct 25, 2016

]]>Analyzing the dimension of an unknown quantum system in a device-independent manner, i.e., using only the measurement statistics, is a fundamental task in quantum physics and quantum information theory. In this paper, we consider this problem in the prepare-and-measure scenario. Specifically, we pro…

[Phys. Rev. A 94, 042125] Published Tue Oct 25, 2016

]]>We investigate the possibility of distinguishing among different causal relations starting from a limited set of marginals. Our main tool is the notion of adhesivity, that is, the extension of probability or entropies defined only on subsets of variables, which provides additional independence const…

[Phys. Rev. A 94, 042127] Published Tue Oct 25, 2016

]]>We study strongly correlated ground states of dipolar fermions in a honeycomb optical lattice with spatial variations in hopping amplitudes. Similar to strained graphene, such nonuniform hopping amplitudes produce valley-dependent pseudomagnetic fields for fermions near the two Dirac points, resulti…

[Phys. Rev. A 94, 043641] Published Tue Oct 25, 2016

]]>We study the relaxation of a two-dimensional (2D) ultracold Bose gas from a nonequilibrium initial state containing vortex excitations in experimentally realizable square and rectangular traps. We show that the subsystem of vortex gas excitations results in the spontaneous emergence of a coherent su…

[Phys. Rev. A 94, 043642] Published Tue Oct 25, 2016

]]>Brillouin scattering is a fundamental nonlinear interaction between two optical waves and an acoustic wave mediated by electrostriction and photoelasticity. In this paper, we revisit the usual theory of this inelastic scattering to get a joint system in which the acoustic wave is strongly coupled to…

[Phys. Rev. A 94, 043847] Published Tue Oct 25, 2016

]]>We demonstrate numerically light-pulse combining and pulse compression using wave-collapse (self-focusing) energy-localization dynamics in a continuous-discrete nonlinear system, as implemented in a multicore fiber (MCF) using one-dimensional (1D) and 2D core distribution designs. Large-scale numeri…

[Phys. Rev. A 94, 043848] Published Tue Oct 25, 2016

]]>High-finesse frequency combs (HFC) with large ratio of the frequency spacing to the width of the spectral components have demonstrated remarkable results in many applications such as precision spectroscopy and metrology. We found that low-finesse frequency combs having very small ratio of the freque…

[Phys. Rev. A 94, 043849] Published Tue Oct 25, 2016

]]>The theory of quantum Brownian motion describes the properties of a large class of open quantum systems. Nonetheless, its description in terms of a Born-Markov master equation, widely used in the literature, is known to violate the positivity of the density operator at very low temperatures. We stud…

[Phys. Rev. A 94, 042123] Published Mon Oct 24, 2016

]]>The Pusey-Barrett-Rudolph (PBR) no-go theorem provides an argument for the reality of the quantum state by ruling out $\psi $-epistemic ontological theories, in which the quantum state is of a statistical nature. It applies under an assumption of preparation independence, the validity of which has been su…

[Phys. Rev. A 94, 042124] Published Mon Oct 24, 2016

]]>We discuss ground-state factorization schemes in spin $S$ arrays with general quadratic couplings under general magnetic fields, not necessarily uniform or transverse. It is shown that, given arbitrary spin alignment directions at each site, nonzero $XYZ$ couplings between any pair and fields at each si…

[Phys. Rev. A 94, 042335] Published Mon Oct 24, 2016

]]>It is shown that transient spin-spin correlations in a one-dimensional spin $S\gg 1$ chain can be enhanced for initially factorized and individually squeezed spin states. Such correlation transfer from “internal” to “external” degrees of freedom can be well described by using a semiclassical phase-space …

[Phys. Rev. A 94, 042336] Published Mon Oct 24, 2016

]]>Quantum information processing is expressed using quantum bits (qubits) and quantum gates which are arranged in terms of quantum circuits. Here, each qubit is associated with a quantum circuit wire which is used to conduct the desired operations. Most of the existing quantum circuits allocate a sing…

[Phys. Rev. A 94, 042337] Published Mon Oct 24, 2016

]]>We compare the effect of single qubit incoherent and coherent errors on the logical error rate of the Steane [[7,1,3]] quantum error correction code by performing an exact full-density-matrix simulation of an error correction step. We find that the effective 1-qubit process matrix at the logical lev…

[Phys. Rev. A 94, 042338] Published Mon Oct 24, 2016

]]>Boson sampling is the problem of generating a multiphoton state whose counting probability is the permanent of an $n\times n$ matrix. This is created as the output $n$-photon coincidence rate of a prototype quantum computing device with $n$ input photons. It is a fundamental challenge to verify boson sampling, …

[Phys. Rev. A 94, 042339] Published Mon Oct 24, 2016

]]>We propose a scheme to actively cool the fundamental flexural (out-of-plane) mode of a graphene sheet via vacuum forces. Our setup consists of a cold-atom cloud placed close to a graphene sheet at distances of a few micrometers. The atoms couple to the graphene membrane via Casimir-Polder forces. By…

[Phys. Rev. A 94, 043420] Published Mon Oct 24, 2016

]]>Experimental observation confirms the in-phase and out-of-phase eigenmodes description of the temperature dependence in the oscillations of an excited Bose-Einstein condensate, where a truly isotropic confining potential helps to observe the collapse and revival of the monopole mode of the finite-temperature gas.

[Phys. Rev. A 94, 043640] Published Mon Oct 24, 2016

]]>We present a scheme to realize the (extended) Bose-Hubbard model in an $N$-coupled optomechanical system. By treating the cavities as intermediary and eliminating them adiabatically with the condition of large detuning or fast decay, we can obtain the effective Hamiltonian for the $N$ oscillators, with …

[Phys. Rev. A 94, 043842] Published Mon Oct 24, 2016

]]>We examine the propagation of a weak probe light through a coherently driven $\mathsf{Y}\mathsf{\text{\u2212}}\mathsf{type}$ system. Under the condition that the excited atomic levels decay via the same vacuum modes, the effects of quantum interference in decay channels are considered. It is found that the interference in decay channels re…

[Phys. Rev. A 94, 043843] Published Mon Oct 24, 2016

]]>Collective coupling between dipoles can dramatically modify the optical response of a medium. Such effects depend strongly on the geometry of the medium and the polarization of the light. Using a classical coupled dipole model, here we investigate the simplest case of one-dimensional arrays of inter…

[Phys. Rev. A 94, 043844] Published Mon Oct 24, 2016

]]>We study the angular deflection of the circularly polarized components of a linearly polarized probe field in a weakly birefringent atomic system in tripod configuration. A spatially inhomogeneous control field incident obliquely onto an atomic vapor cell facilitates a large angular divergence betwe…

[Phys. Rev. A 94, 043845] Published Mon Oct 24, 2016

]]>It is common knowledge that diffusion theory cannot describe light propagation in semitransparent media, i.e., media with a low optical thickness. However, even in an optically thin slab, late-time transport will be eventually determined by a multiple scattering process whose characteristics are sti…

[Phys. Rev. A 94, 043846] Published Mon Oct 24, 2016

]]>[Phys. Rev. A 94, 049903] Published Mon Oct 24, 2016

]]>In contrast to plane waves, twisted or vortex beams have a complex spatial structure. Both their intensity and energy flow vary within the wave front. Beyond that, polychromatic vortex beams, such as $X$ waves, have a spatially dependent energy distribution. We propose a method to measure this (local)…

[Phys. Rev. A 94, 041402(R)] Published Fri Oct 21, 2016

]]>We investigate sensing of magnetic fields using quantum spin chains at finite temperature and exploit quantum phase crossovers to improve metrological bounds on the estimation of the chain parameters. In particular, we start by analyzing the $XX$ spin chain. The magnetic sensitivity of this system is …

[Phys. Rev. A 94, 042121] Published Fri Oct 21, 2016

]]>A universal approach to decoherence control combined with quantum estimation theory reveals a critical behavior, akin to a phase transition, of the information obtainable by a qubit probe concerning the memory time of environmental fluctuations of generalized Ornstein-Uhlenbeck processes. The critic…

[Phys. Rev. A 94, 042122] Published Fri Oct 21, 2016

]]>We analyze a generalized quantum error-correction code against photon loss where a logical qubit is encoded into a subspace of a single oscillator mode that is spanned by distinct multicomponent cat states (coherent-state superpositions). We present a systematic code construction that includes the e…

[Phys. Rev. A 94, 042332] Published Fri Oct 21, 2016

]]>Entanglement depth characterizes the minimal number of particles in a system that are mutually entangled. For symmetric states, there is a dichotomy for entanglement depth: An $N$-particle symmetric state is either fully separable or fully entangled—the entanglement depth is either 1 or $N$. We show tha…

[Phys. Rev. A 94, 042333] Published Fri Oct 21, 2016

]]>We propose a scheme for quantum teleportation between two qubits, coupled sequentially to a cavity field. An implementation of the scheme is analyzed with superconducting qubits and a transmission line resonator, where measurements are restricted to continuous probing of the field leaking from the r…

[Phys. Rev. A 94, 042334] Published Fri Oct 21, 2016

]]>Energies and lifetimes (widths) of vibrational states above the lowest dissociation limit of ${}^{16}\mathrm{O}_{3}$ were determined using a previously developed efficient approach, which combines hyperspherical coordinates and a complex absorbing potential. The calculations are based on a recently computed potential …

[Phys. Rev. A 94, 042514] Published Fri Oct 21, 2016

]]>Electron scattering with atomic oxygen has been studied using the $B$-spline $R$-matrix-with-pseudostates method. Cross sections for elastic scattering, excitation, emission, and ionization processes are presented. The excitation cross sections have been calculated for transitions between the $2{s}^{2}2{p}^{4}$ and…

[Phys. Rev. A 94, 042707] Published Fri Oct 21, 2016

]]>We propose methods of optical pumping that are applicable to open, high-angular-momentum transitions in atoms and molecules, for which conventional optical pumping would lead to significant population loss. Instead of applying circularly polarized cw light, as in conventional optical pumping, we pro…

[Phys. Rev. A 94, 043416] Published Fri Oct 21, 2016

]]>The observation of the Stark-tuned Förster resonances between Rydberg atoms excited by narrowband cw laser radiation requires usage of a Stark-switching technique in order to excite the atoms first in a fixed electric field and then to induce the interactions in a varied electric field, which is sca…

[Phys. Rev. A 94, 043417] Published Fri Oct 21, 2016

]]>We report the observation of nonsequential two-photon absorption from the $K$ shell of solid Zr (atomic number $Z=40)$ using intense x-ray pulses from the Spring-8 Angstrom Compact Free-Electron Laser (SACLA). We determine the generalized nonlinear two-photon absorption cross section at the two-photon t…

[Phys. Rev. A 94, 043418] Published Fri Oct 21, 2016

]]>We analyze the two-dimensional photoelectron momentum distribution of an Ar atom ionized by midinfrared laser pulses and mainly concentrate on the energy range below $2{U}_{p}$. By using a generalized quantum trajectory Monte Carlo simulation and comparing with the numerical solution of the time-dependent …

[Phys. Rev. A 94, 043419] Published Fri Oct 21, 2016

]]>Supersolid phases as a result of a coexistence of superfluid and density ordered checkerboard phases are predicted to appear in ultracold Fermi molecules confined in a bilayer array of two-dimensional square optical lattices. We demonstrate the existence of these phases within the inhomogeneous mean…

[Phys. Rev. A 94, 043638] Published Fri Oct 21, 2016

]]>Deterministic preparation of an ultracold harmonically trapped one-dimensional Fermi gas consisting of a few fermions has been realized by the Heidelberg group. Using Floquet formalism, we study the time dynamics of two- and three-fermion systems in a harmonic trap under an oscillating magnetic fiel…

[Phys. Rev. A 94, 043639] Published Fri Oct 21, 2016

]]>Following up on previous studies on *parity-time-symmetric* gain-loss bilayers, and inspired by formal analogies with plasmonic waveguides, we study non-Hermiticity-induced wave confinement and guiding phenomena that can occur in loss-gain-loss three-layers. By revisiting previous well-established “ga…

[Phys. Rev. A 94, 043838] Published Fri Oct 21, 2016

]]>We investigate the behavior of two quantum emitters (two-level atoms) embedded in a linear waveguide, in a quasi-one-dimensional configuration. Since the atoms can emit, absorb, and reflect radiation, the pair can spontaneously relax towards an entangled bound state, under conditions in which a sing…

[Phys. Rev. A 94, 043839] Published Fri Oct 21, 2016

]]>We study exact solutions of the steady-state behavior of several nonlinear open quantum systems which can be applied to the field of circuit quantum electrodynamics. Using Fokker-Planck equations in the generalized $P$ representation, we investigate the analytical solutions of two fundamental models. …

[Phys. Rev. A 94, 043840] Published Fri Oct 21, 2016

]]>Superradiant lasers based on atomic ensembles exhibiting ultranarrow optical transitions can emit light of unprecedented spectral purity and may serve as active atomic clocks. We consider two frequency-detuned active atomic clocks, which are coupled in a cascaded setup, i.e., as master and slave las…

[Phys. Rev. A 94, 043841] Published Fri Oct 21, 2016

]]>The hypothesis of a discrete fabric of the universe, the “Planck scale,” is always on stage since it solves mathematical and conceptual problems in the infinitely small. However, it clashes with special relativity, which is designed for the continuum. Here, we show how the clash can be overcome with…

[Phys. Rev. A 94, 042120] Published Thu Oct 20, 2016

]]>Remote state preparation (RSP) provides an indirect way of transferring quantum information based on the nonlocal effect of quantum measurement. Although RSP has been demonstrated in recent years to remotely prepare multiphoton states, quantum measurement on the same number of additional photons was…

[Phys. Rev. A 94, 042329] Published Thu Oct 20, 2016

]]>We introduce two tangle-based four-party entanglement measures ${t}_{1}$ and ${t}_{2}$, and two negativity-based measures ${n}_{1}$ and ${n}_{2}$, which are derived from the monogamy relations. These measures are computed for three four-qubit maximally entangled and $W$ states explicitly. We also compute these measures for the r…

[Phys. Rev. A 94, 042330] Published Thu Oct 20, 2016

]]>We present a general method to derive entanglement breaking (EB) conditions for continuous-variable quantum gates. We start with an arbitrary entanglement witness and reach an EB condition. The resultant EB condition is applicable not only for quantum channels but also for general quantum operations…

[Phys. Rev. A 94, 042331] Published Thu Oct 20, 2016

]]>We discuss the characteristics of the dependence of attosecond transient-absorption spectra on the angle between the molecular alignment axis and the polarization of the pump and probe fields. We show how the dipole couplings and therefore the spectra can efficiently be controlled by exploiting the …

[Phys. Rev. A 94, 043414] Published Thu Oct 20, 2016

]]>The surface plasmon in silver clusters is red shifted with respect to standard jellium random-phase approximation (RPA) predictions that work well for simple metal clusters. The reason for the deviation arises primarily from the non-negligible polarization interaction between the valence electrons a…

[Phys. Rev. A 94, 043415] Published Thu Oct 20, 2016

]]>We present a theory for the diffraction of large molecules or nanoparticles at a standing light wave. Such particles can act as a genuine photon absorbers due to their numerous internal degrees of freedom effecting fast internal energy conversion. Our theory incorporates the interplay of three light…

[Phys. Rev. A 94, 043637] Published Thu Oct 20, 2016

]]>The scattering matrix $S$ obeys the symmetry property $\mathcal{PT}S\mathcal{PT}={S}^{-1}$ in a parity-time $\left(\mathcal{PT}\right)$ symmetric system and the unitary relation ${S}^{\u2020}S=1$ in the absence of gain and loss. Here we report a different symmetry relation of $S$ in a one-dimensional heterostructure, which is given by the amplitude ratio of the in…

[Phys. Rev. A 94, 043836] Published Thu Oct 20, 2016

]]>We use the exact calculation of the quantum mechanical, temporal characteristic function $\chi \left(\eta \right)$ and the degree of second-order coherence ${g}^{\left(2\right)}\left(\tau \right)$ for a single-mode, degenerate parametric amplifier for a system in the Gaussian state, *viz*., a displaced-squeezed thermal state, to study the different crite…

[Phys. Rev. A 94, 043837] Published Thu Oct 20, 2016

]]>Particles of low velocity, traveling without dissipation in a superfluid, can interact and emit sound when they collide. We propose a minimal model in which the equations of motion of the particles, including a short-range repulsive force, are self-consistently coupled with the Gross-Pitaevskii equa…

[Phys. Rev. A 94, 041602(R)] Published Wed Oct 19, 2016

]]>The information content of the two-particle one- and two-dimensional Calogero model is studied by using the von Neumann and Rényi entropies. The one-dimensional model is shown to have nonmonotonic entropies with finite values in the large-interaction-strength limit. On the other hand, the von Neuman…

[Phys. Rev. A 94, 042115] Published Wed Oct 19, 2016

]]>The quantum character of Josephson junctions is ordinarily revealed through the analysis of the switching currents, i.e., the current at which a finite voltage appears: A sharp rise of the voltage signals the passage (tunnel) from a trapped state (the zero voltage solution) to a running state (the f…

[Phys. Rev. A 94, 042116] Published Wed Oct 19, 2016

]]>It is shown how possible corrections to ordinary quantum mechanics described by the Lindblad equation might be detected by exploiting the great precision of atomic clocks.

[Phys. Rev. A 94, 042117] Published Wed Oct 19, 2016

]]>The ground-state properties of a few spin-1/2 fermions with different masses and interacting via short-range contact forces are studied within an exact diagonalization approach. It is shown that, depending on the shape of the external confinement, different scenarios of the spatial separation betwee…

[Phys. Rev. A 94, 042118] Published Wed Oct 19, 2016

]]>We construct Einstein-Podolsky-Rosen (EPR) steering signatures for the nonlocality of the entangled superposition state described by $\frac{1}{\sqrt{2}}\left\{\right|N\rangle |0\rangle +|0\rangle |N\rangle \}$, called the two-mode NOON state. The signatures are a violation of an EPR steering inequality based on an uncertainty relation. The violation confirm…

[Phys. Rev. A 94, 042119] Published Wed Oct 19, 2016

]]>We describe an experimental implementation to generate and measure high-dimensional time-bin-entangled qudits. Two-photon time-bin entanglement is generated via spontaneous four-wave mixing in single-mode fiber. Unbalanced Mach-Zehnder interferometers transform selected time bins to polarization ent…

[Phys. Rev. A 94, 042328] Published Wed Oct 19, 2016

]]>We simulate nuclear and electron spin relaxation rates in a paramagnetic system from first principles. Sampling a molecular dynamics trajectory with quantum-chemical calculations produces a time series of the instantaneous parameters of the relevant spin Hamiltonian. The Hamiltonians are, in turn, u…

[Phys. Rev. A 94, 043413] Published Wed Oct 19, 2016

]]>We consider a spin-1 Bose-Einstein condensate with Rashba spin-orbit coupling and dipole-dipole interaction confined in a cigar-shaped trap. Due to the combined effects of spin-orbit coupling, dipole-dipole interaction, and trap geometry, the system exhibits a rich variety of ground-state spin struc…

[Phys. Rev. A 94, 043633] Published Wed Oct 19, 2016

]]>Coherent coupling generated by laser light between the hyperfine states of atoms, loaded in a one-dimensional (1D) optical lattice, gives rise to the “synthetic dimension” system which is equivalent to a Hofstadter model in a finite strip of square lattice. An SU($M$) symmetric attractive interaction …

[Phys. Rev. A 94, 043634] Published Wed Oct 19, 2016

]]>We study the effect of an external harmonic trapping potential on an outcome of the nonadiabatic quantum phase transition from an antiferromagnetic to a phase-separated state in a spin-1 atomic condensate. Previously, we demonstrated that the dynamics of an untrapped system exhibits double universal…

[Phys. Rev. A 94, 043635] Published Wed Oct 19, 2016

]]>We show the renormalization of the contact interaction for odd-wave scattering in one-dimension (1D). Based on the renormalized interaction, we exactly solve the two-body problem in a harmonic trap and further explore the universal properties of spin-polarized fermions near odd-wave resonance by usi…

[Phys. Rev. A 94, 043636] Published Wed Oct 19, 2016

]]>We study the statistics of the fluorescence decay rates for single quantum emitters embedded in a scattering medium undergoing a phase transition. Under certain circumstances, the structural properties of the scattering medium explore a regime in which the system dynamically switches between two dif…

[Phys. Rev. A 94, 043832] Published Wed Oct 19, 2016

]]>Efficient light storage in an atomic ensemble with very high optical depth is demonstrated. The experiment is a step forward to achieving strong interactions between individual photons.

[Phys. Rev. A 94, 043833] Published Wed Oct 19, 2016

]]>The recent advent of wave-shaping methods has demonstrated the focusing of light through and inside even the most strongly scattering materials. Typically in wavefront shaping, light is focused in an area with the size of one speckle spot. It has been shown that the intensity is not only increased i…

[Phys. Rev. A 94, 043834] Published Wed Oct 19, 2016

]]>Photonic crystal fibers doped with silver nanoparticles exhibit a Kerr nonlinearity that can be positive or negative depending on the input wavelength and which vanishes at a specific wavelength. The existence of negative nonlinearity allows soliton formation even in the normal-dispersion region of …

[Phys. Rev. A 94, 043835] Published Wed Oct 19, 2016

]]>We discuss the failure of the Markov approximation in the description of atom-surface fluctuation-induced interactions, both in equilibrium (Casimir-Polder forces) and out of equilibrium (quantum friction). Using general theoretical arguments, we show that the Markov approximation can lead to errone…

[Phys. Rev. A 94, 042114] Published Tue Oct 18, 2016

]]>We present observable lower bounds for several bipartite entanglement measures including entanglement of formation, geometric measure of entanglement, concurrence, convex-roof extended negativity, and $G$ concurrence. The lower bounds facilitate estimates of these entanglement measures for arbitrary f…

[Phys. Rev. A 94, 042325] Published Tue Oct 18, 2016

]]>We consider continuous quantum measurement of a superconducting qubit in the circuit QED setup with a moderate bandwidth of the measurement resonator, i.e., when the “bad-cavity” limit is not applicable. The goal is a simple description of the quantum evolution due to measurement, i.e., the measurem…

[Phys. Rev. A 94, 042326] Published Tue Oct 18, 2016

]]>We derive families of optimal and near-optimal probe states for quantum estimation of the coupling constants of a general two-mode number-conserving bosonic Hamiltonian describing one-body and two-body dynamics. We find that the optimal states for estimating the dephasing of the modes, the self-inte…

[Phys. Rev. A 94, 042327] Published Tue Oct 18, 2016

]]>We extend our recent work [Y. Endo *et al.*, Phys. Rev. A **92**, 023610 (2015)] for a parity-mixing effect in a model of two-dimensional lattice fermions to a *realistic three-dimensional* ultracold Fermi gas. Including effects of broken local spatial inversion symmetry by a trap potential within the fram…

[Phys. Rev. A 94, 043632] Published Tue Oct 18, 2016

]]>We propose a mechanism for the realization of exact control of parity-time $\left(\mathcal{PT}\right)$ symmetry by using a periodically modulated nonlinear optical coupler with balanced gain and loss. It is shown that for certain appropriately chosen values of the modulation parameters, we can construct a family of exact …

[Phys. Rev. A 94, 043828] Published Tue Oct 18, 2016

]]>We show that gyrotropic structures with balanced gain and loss that respect antilinear symmetries exhibit a giant nonreciprocity at the so-called exact phase where the eigenfrequencies of the isolated non-Hermitian setup are real. The effect occurs in a parameter domain near an exceptional- point (E…

[Phys. Rev. A 94, 043829] Published Tue Oct 18, 2016

]]>A method is proposed to optimize signals in nonlinear microscopy in order to circumvent difficulties associated with scattering media. In comparison to traditional nonlinear optimization techniques, the obtained results show a faster and more efficient imaging capability.

[Phys. Rev. A 94, 043830] Published Tue Oct 18, 2016

]]>We develop a simple and general method to construct arbitrary flat-band lattices. We identify the basic ingredients behind zero-dispersion bands and develop a method to construct extended lattices based on a consecutive repetition of a given miniarray. The number of degenerated localized states is d…

[Phys. Rev. A 94, 043831] Published Tue Oct 18, 2016

]]>The capacity of classical channels is convex. This is not the case for the quantum capacity of a channel: The capacity of a mixture of different quantum channels exceeds the mixture of the individual capacities and thus is nonconvex. Here we show that this effect goes beyond the quantum capacity and…

[Phys. Rev. A 94, 040301(R)] Published Mon Oct 17, 2016

]]>We report a method to characterize the propagation of an ultrashort pulse of light through a multiple scattering medium by measuring its time-resolved transmission matrix. This method is based on the use of a spatial light modulator together with a coherent time-gated detection of the transmitted sp…

[Phys. Rev. A 94, 041802(R)] Published Mon Oct 17, 2016

]]>We investigate theoretically the dynamical dephasing of a quantum system induced by non-Markovian noise in a nonequilibrium environment. We derive the closed equation of the dephasing factor for the quantum system under the nonstationary non-Markovian dichotomic noise environment. It is shown that t…

[Phys. Rev. A 94, 042110] Published Mon Oct 17, 2016

]]>The progress in high-precision spectroscopy requires one to verify the accuracy of theoretical models, such as the master equation describing spontaneous emission of atoms. For this purpose, we apply the coarse-graining method to derive a master equation of an atom interacting with the modes of the …

[Phys. Rev. A 94, 042111] Published Mon Oct 17, 2016

]]>Bell's theorem shows that our intuitive understanding of causation must be overturned in light of quantum correlations. Nevertheless, quantum mechanics does not permit signaling and hence a notion of cause remains. Understanding this notion is not only important at a fundamental level, but also for …

[Phys. Rev. A 94, 042112] Published Mon Oct 17, 2016

]]>General probabilistic theories are designed to provide operationally the most general probabilistic models including both classical and quantum theories. In this paper, we introduce a systematic method to construct a series of entropies, all of which generalize Shannon entropy in classical systems a…

[Phys. Rev. A 94, 042113] Published Mon Oct 17, 2016

]]>We study theoretically the responses of the dynamically corrected gates to time-dependent noises in the exchange-only spin-qubit system. We consider $1/f$ noises having spectra proportional to $1/{\omega}^{\alpha}$, where the exponent $\alpha $ indicates the strength of correlation within the noise. The quantum gate errors du…

[Phys. Rev. A 94, 042323] Published Mon Oct 17, 2016

]]>Tensor eigenvalues and eigenvectors have been introduced in the recent mathematical literature as a generalization of the usual matrix eigenvalues and eigenvectors. We apply this formalism to a tensor that describes a multipartite symmetric state or a spin state, and we investigate to what extent th…

[Phys. Rev. A 94, 042324] Published Mon Oct 17, 2016

]]>Calculation of the differential cross section for the dielectronic recombination with two-electron uranium within the framework of QED is presented. The polarization of the emitted photon is investigated. The contributions of the Breit interaction and the interference of the photon multipoles are st…

[Phys. Rev. A 94, 042513] Published Mon Oct 17, 2016

]]>Ultrafast photoionization dynamics within a driver field cycle is shown to be the key to understanding the multifaceted role of the Keldysh parameter *γ* as the borderline between multiphoton and tunneling ionization, ionization adiabaticity degree, and a measure for the electron tunneling time. We de…

[Phys. Rev. A 94, 043412] Published Mon Oct 17, 2016

]]>A binary mixture of interacting Bose-Einstein condensates (BEC) in the presence of fragmentation-driving external lattice potentials forms two interdependent mean-field lattices made of each component. These effective mean-field lattices, like ordinary optical lattices, can induce additional fragmen…

[Phys. Rev. A 94, 043631] Published Mon Oct 17, 2016

]]>We perform a theoretical investigation into the classical and quantum dynamics of an optical field in a cavity containing a moving membrane (“membrane-in-the-middle” setup). Our approach is based on the Maxwell wave equation and complements previous studies based on an effective Hamiltonian. The ana…

[Phys. Rev. A 94, 043823] Published Mon Oct 17, 2016

]]>We investigate the dynamics of cavity-free lasing from neutral nitrogen molecules in femtosecond laser filaments. An important difference of intensity and temporal duration is observed between backward and forward lasing, in both amplified spontaneous emission and seed-amplification regimes. Numeric…

[Phys. Rev. A 94, 043824] Published Mon Oct 17, 2016

]]>We measure a transverse momentum kick in a Sagnac interferometer using weak-value amplification with two postselections. The first postselection is controlled by a polarization-dependent phase mismatch between both paths of the interferometer, and the second postselection is controlled by a polarize…

[Phys. Rev. A 94, 043825] Published Mon Oct 17, 2016

]]>We present a general input-output formalism for the few-photon transport in multiple waveguide channels coupled to a local cavity. Using this formalism, we study the effect of Fano interference in two-photon quantum transport. We show that the physics of Fano interference can manifest as an asymmetr…

[Phys. Rev. A 94, 043826] Published Mon Oct 17, 2016

]]>It has been found by numerical simulation that dissipative soliton resonance in passive mode-locked fiber lasers with anomalous dispersion can result in the formation of rectangular pulses with a spectral doublet. With an increase in the pump power and hence in the length of the pulses, the width of…

[Phys. Rev. A 94, 043827] Published Mon Oct 17, 2016

]]>We consider the Landau-Zener problem for a multilevel quantum system that is coupled to an external environment. In particular, we consider a number of cases of three-level systems coupled to a harmonic oscillator that represents the external environment. We find that, similar to the case of the Lan…

[Phys. Rev. A 94, 042109] Published Fri Oct 14, 2016

]]>With the assistance of weak cross-Kerr nonlinearities, we present a preparation scheme of four-photon polarization-entangled decoherence-free states, which can be used to construct the minimal optical decoherence-free subspaces where a logical qubit is fully protected against collective decoherence.…

[Phys. Rev. A 94, 042321] Published Fri Oct 14, 2016

]]>The unavoidable interaction between a quantum system and the external noisy environment can be mimicked by a sequence of stochastic measurements whose outcomes are neglected. Here we investigate how this stochasticity is reflected in the survival probability to find the system in a given Hilbert sub…

[Phys. Rev. A 94, 042322] Published Fri Oct 14, 2016

]]>We performed a diabatization of the mutually perturbed $1{}^{1}\mathrm{\Pi}$ and $2{}^{1}\mathrm{\Pi}$ states of KRb based on both electronic structure calculation and direct coupled-channel deperturbation analysis of experimental energies. The potential energy curves (PECs) of the diabatic states and their scalar coupling were constr…

[Phys. Rev. A 94, 042510] Published Fri Oct 14, 2016

]]>We consider the dynamical atom-surface Casimir-Polder force in the nonequilibrium configuration of an atom near a perfectly conducting wall, initially prepared in an excited state with the field in its vacuum state. We evaluate the time-dependent Casimir-Polder force on the atom and find that it sho…

[Phys. Rev. A 94, 042511] Published Fri Oct 14, 2016

]]>A high-accuracy, nonrelativistic wave function is used to study nuclear motion in the ground state of three-particle $\left\{{a}_{1}^{+}{a}_{2}^{+}{a}_{3}^{-}\right\}$ electronic and muonic molecular systems without assuming the Born-Oppenheimer approximation. Intracule densities and center-of-mass particle densities show that as the mas…

[Phys. Rev. A 94, 042512] Published Fri Oct 14, 2016

]]>Experiments on trapped quantum gases can probe challenging regimes of quantum many-body dynamics, where strong interactions or nonequilibrium states prevent exact solutions. Here we present a different kind of exact result, which applies even in the absence of actual solutions: a class of space-time…

[Phys. Rev. A 94, 043628] Published Fri Oct 14, 2016

]]>We investigate the effect of a periodic potential generated by a one-dimensional optical lattice on the magnetic properties of an $S=1/2$ spin-orbit-coupled Bose gas. By increasing the lattice strength one can achieve a magnetic phase transition between a polarized and an unpolarized Bloch wave phase,…

[Phys. Rev. A 94, 043629] Published Fri Oct 14, 2016

]]>We discuss the dynamical response of strongly interacting Bose atoms in an adiabatically tilted optical lattice. The analysis is performed in terms of the multilevel Landau-Zener tunneling. Different regimes of tunneling are identified and analytical expressions for the doublon number, which is the …

[Phys. Rev. A 94, 043630] Published Fri Oct 14, 2016

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