We study how temperature affects the lifetime of a quantized, persistent current state in a toroidal Bose-Einstein condensate. When the temperature is increased, we find a decrease in the persistent current lifetime. Comparing our measured decay rates to simple models of thermal activation and quant…

[Phys. Rev. A 95, 021602(R)] Published Fri Feb 24, 2017

]]>Logical nonlocality is completely characterized by Hardy's “paradox” in $(2,2,l)$ and $(2,k,2)$ scenarios. We consider a variety of consequences and applications of this fact. (i) Polynomial algorithms may be given for deciding logical nonlocality in these scenarios. (ii) Bell states are the only entang…

[Phys. Rev. A 95, 022122] Published Fri Feb 24, 2017

]]>We study how correlations affect the performance of the simulator of a Maxwell's demon demonstrated in a recent optical experiment [M. D. Vidrighin, O. Dahlsten, M. Barbieri, M. S. Kim, V. Vedral, and I. A. Walmsley, Phys. Rev. Lett. **116**, 050401 (2016)]. The power of the demon is found to be enhance…

[Phys. Rev. A 95, 022123] Published Fri Feb 24, 2017

]]>Recent developments in quantum gas microscopy open up the possibility of real-time observation of quantum many-body systems. To understand the dynamics of atoms under such circumstances, we formulate the dynamics under a real-time spatially resolved measurement and show that, in an appropriate limit…

[Phys. Rev. A 95, 022124] Published Fri Feb 24, 2017

]]>A non-Hermitian interferometer can realize asymmetric transmission in the presence of imaginary potential and magnetic flux. Here, we propose a non-Hermitian dimer with an unequal hopping rate by an interferometerlike cluster in the framework of a tight-binding model. The intriguing features of this…

[Phys. Rev. A 95, 022125] Published Fri Feb 24, 2017

]]>We study the Hamiltonian identifiability of a many-body spin-$1/2$ system assisted by the measurement on a single quantum probe based on the eigensystem realization algorithm approach employed in Zhang and Sarovar, Phys. Rev. Lett. **113**, 080401 (2014). We demonstrate a potential application of Gröbner …

[Phys. Rev. A 95, 022335] Published Fri Feb 24, 2017

]]>Pauli's exclusion principle has a strong impact on the properties of most fermionic quantum systems. Remarkably, the fermionic exchange symmetry implies further constraints on the one-particle picture. By exploiting those generalized Pauli constraints, we derive a measure which quantifies the influe…

[Phys. Rev. A 95, 022336] Published Fri Feb 24, 2017

]]>Atomic-molecular Bose-Einstein condensates (BECs) offer brand new opportunities to revolutionize quantum gases and probe the variation of fundamental constants with unprecedented sensitivity. The recent realization of spin-orbit coupling (SOC) in BECs provides a new platform for exploring completely…

[Phys. Rev. A 95, 023624] Published Fri Feb 24, 2017

]]>We investigate numerically the momentum correlations in a two-dimensional, harmonically trapped interacting Bose system at $T=0$ temperature, by using a particle number preserving Bogoliubov approximation. Interaction-induced quantum fluctuations of the quasicondensate lead to a large anticorrelation …

[Phys. Rev. A 95, 023625] Published Fri Feb 24, 2017

]]>We have calculated the zero-temperature binding energy of a single impurity atom immersed in a Bose-Einstein condensate (BEC) of ultracold atoms. The impurity and the condensed atoms are trapped in the respective axially symmetric harmonic potentials, where the impurity interacts with bosonic atoms …

[Phys. Rev. A 95, 023626] Published Fri Feb 24, 2017

]]>We investigate the radiative coupling between two two-level atoms with arbitrarily polarized dipoles in the vicinity of a nanofiber. We present a systematic derivation for the master equation, the single- and cross-atom decay coefficients, and the dipole-dipole interaction coefficients for the atoms…

[Phys. Rev. A 95, 023838] Published Fri Feb 24, 2017

]]>Bad cavity lasers are experiencing renewed interest in the context of active optical frequency standards, due to their enhanced robustness against fluctuations of the laser cavity. The gain medium would consist of narrow-linewidth atoms, either trapped inside the cavity or intersecting the cavity mo…

[Phys. Rev. A 95, 023839] Published Fri Feb 24, 2017

]]>[Phys. Rev. A 95, 029904] Published Fri Feb 24, 2017

]]>We introduce multipulse quantum noise spectroscopy protocols for spectral estimation of the noise affecting multiple qubits coupled to Gaussian dephasing environments including both classical and quantum sources. Our protocols are capable of reconstructing all the noise auto- and cross-correlation s…

[Phys. Rev. A 95, 022121] Published Thu Feb 23, 2017

]]>We cast the problem of illuminating an object in a noisy environment into a communication protocol. A probe is sent into the environment, and the presence or absence of the object constitutes a signal encoded on the probe. The probe is then measured to decode the signal. We calculate the Holevo info…

[Phys. Rev. A 95, 022333] Published Thu Feb 23, 2017

]]>Superposition, arguably the most fundamental property of quantum mechanics, lies at the heart of quantum information science. However, how to create the superposition of any two unknown pure states remains as a daunting challenge. Recently, it was proved that such a quantum protocol does not exist i…

[Phys. Rev. A 95, 022334] Published Thu Feb 23, 2017

]]>Repulsive Casimir-Lifshitz forces are known to exist between two dissimilar materials if a third material, whose dielectric response is intermediate, separates them. However, the force between two identical materials is almost always attractive. Here we show that the force between two identical, sem…

[Phys. Rev. A 95, 022509] Published Thu Feb 23, 2017

]]>A two-dimensional model of the resonant electron-molecule collision processes with one nuclear and one electronic degree of freedom introduced by K. Houfek, T. N. Rescigno, and C. W. McCurdy [Phys. Rev. A **73**, 032721 (2006)] is reformulated within the time-dependent framework and solved numerically u…

[Phys. Rev. A 95, 022714] Published Thu Feb 23, 2017

]]>We consider the Schrödinger equation for the hydrogen atom in a uniform electric field, searching for solutions of this equation in parabolic coordinates in a separable form. With some restrictions on the parameters, we have found the exact analytical expressions for the continuum wave function comp…

[Phys. Rev. A 95, 023419] Published Thu Feb 23, 2017

]]>We propose and analyze a pumped and damped Bose-Hubbard dimer as a source of continuous-variable Einstein-Podolsky-Rosen (EPR) steering with non-Gaussian statistics. We use and compare the results of the approximate truncated Wigner and the exact positive-$P$ representation to calculate and compare th…

[Phys. Rev. A 95, 023623] Published Thu Feb 23, 2017

]]>We present a general method to obtain the stable lasing solutions for the steady-state *ab initio* lasing theory (SALT) for the case of a degenerate symmetric laser in two dimensions (2D). We find that under most regimes (with one pathological exception), the stable solutions are clockwise and counter…

[Phys. Rev. A 95, 023835] Published Thu Feb 23, 2017

]]>Planar microcavities allow the control and manipulation of spin polarization, manifested in phenomena like the optical spin Hall effect due to the intrinsic polarization mode splitting. Here, we study a transparent microcavity with broken rotational symmetry, realized by aligning the optic axis of a…

[Phys. Rev. A 95, 023836] Published Thu Feb 23, 2017

]]>We consider the evolution of light beams in nonlinear media exhibiting nonlinearities up to the seventh order wherein the beam propagation is governed by the cubic-quintic-septimal nonlinear Schrödinger equation. An exact analytic solution that describes dark solitary wave propagation is obtained, b…

[Phys. Rev. A 95, 023837] Published Thu Feb 23, 2017

]]>We describe a direct method for experimental determination of the negativity of an arbitrary two-qubit state with 11 measurements performed on multiple copies of the two-qubit system. Our method is based on the experimentally accessible sequences of singlet projections performed on up to four qubit …

[Phys. Rev. A 95, 022331] Published Wed Feb 22, 2017

]]>A nonrelativistic system such as an ultracold trapped ion may perform a quantum simulation of a Dirac equation dynamics under specific conditions. The resulting Hamiltonian and dynamics are highly controllable, but the coupling between momentum and internal levels poses some difficulties to manipula…

[Phys. Rev. A 95, 022332] Published Wed Feb 22, 2017

]]>We consider the hydrogen atom $\mathrm{H}\left(1s\right)$ exposed to an ultrashort laser pulse with a central frequency ${\omega}_{0}$ ranging from several hundreds of eV to 1.5 keV ($\approx 55$ a.u.) and a peak intensity of $3.51\times {10}^{16}\phantom{\rule{4pt}{0ex}}\mathrm{W}/{\mathrm{cm}}^{2}$. We study the excitation of the atom by stimulated Raman scattering, a process involving pairs of freq…

[Phys. Rev. A 95, 023417] Published Wed Feb 22, 2017

]]>We estimate the Stark and Zeeman shifts in the transition frequencies of the ${{}^{16}\mathrm{O}_{2}}^{+}$ molecular ion as a step in the search for the variation in the proton-to-electron mass ratio $\mu $. The ${X}^{2}\mathrm{\Pi}\phantom{\rule{0.16em}{0ex}}v=21-{a}^{4}\mathrm{\Pi}\phantom{\rule{0.16em}{0ex}}v=0$ or the ${X}^{2}\mathrm{\Pi}v=21-{a}^{4}\mathrm{\Pi}\phantom{\rule{0.16em}{0ex}}v=1$ transition frequencies (THz region) of the ${{}^{16}\mathrm{O}_{2}}^{+}$ molecular ion have particularly…

[Phys. Rev. A 95, 023418] Published Wed Feb 22, 2017

]]>The eigenstate thermalization hypothesis provides one picture of thermalization in a quantum system by looking at individual eigenstates. However, it is also important to consider how local observables reach equilibrium values dynamically. Quench protocol is one of the settings to study such questio…

[Phys. Rev. A 95, 023621] Published Wed Feb 22, 2017

]]>We study, by first-principles computer simulations, the low-temperature phase diagram of bosonic dipolar gases in a bilayer geometry as a function of the two control parameters, i.e., the in-plane density and the interlayer distance. We observe four distinct phases, namely, paired and decoupled supe…

[Phys. Rev. A 95, 023622] Published Wed Feb 22, 2017

]]>A one-dimensional periodic array of circular dielectric cylinders surrounded by air is a simple structure on which guided modes above the light line, also called bound states in the continuum (BICs), may exist. Recent studies reveal that such an array supports not only antisymmetric standing waves w…

[Phys. Rev. A 95, 023834] Published Wed Feb 22, 2017

]]>[Phys. Rev. A 95, 029903] Published Wed Feb 22, 2017

]]>It is shown that the single-particle spin-orbit coupling terms, which—in the cold atom context—are associated with synthetic gauge fields, can significantly and nontrivially modify the phase accumulation at small interparticle distances even if the length scale ${\left({k}_{\text{so}}\right)}^{-1}$ associated with the spin-orbit…

[Phys. Rev. A 95, 020702(R)] Published Tue Feb 21, 2017

]]>We study non-Markovian effects present in a driven qubit coupled to a finite environment using a recently proposed model developed in the context of calorimetric measurements of open quantum systems. To quantify the degree of non-Markovianity we use the Breuer-Laine-Piilo (BLP) measure [H.-P. Breuer…

[Phys. Rev. A 95, 022120] Published Tue Feb 21, 2017

]]>Asymmetry of quantum states is a useful resource in applications such as quantum metrology, quantum communication, and reference frame alignment. However, asymmetry of a state tends to be degraded in physical scenarios where environment-induced noise is described by covariant operations, e.g., open …

[Phys. Rev. A 95, 022323] Published Tue Feb 21, 2017

]]>We consider the problems of maximizing the entanglement negativity of X-form qubit-qutrit density matrices with (i) a fixed spectrum and (ii) a fixed purity. In the first case, the problem is solved in full generality whereas, in the latter, partial solutions are obtained by imposing extra spectral …

[Phys. Rev. A 95, 022324] Published Tue Feb 21, 2017

]]>We present an approach for the quantification of quantumness of correlations in fermionic systems. We study the multipartite relative entropy of quantumness in such systems and show how the symmetries in the states can be used to obtain analytical solutions. Numerical evidence of the uniqueness of s…

[Phys. Rev. A 95, 022325] Published Tue Feb 21, 2017

]]>A general framework of optimal eavesdropping on BB84 protocol was provided by Fuchs *et al.* [Phys. Rev. A **56**, 1163 (1997)]. An upper bound on mutual information was derived, which could be achieved by a specific type of interaction and the corresponding measurement. However, uniqueness of optimal int…

[Phys. Rev. A 95, 022326] Published Tue Feb 21, 2017

]]>Trapped charged particles have been at the forefront of quantum information processing (QIP) for a few decades now, with deterministic two-qubit logic gates reaching record fidelities of $99.9\%$ and single-qubit operations of much higher fidelity. In a hybrid system involving trapped charges, quantum …

[Phys. Rev. A 95, 022327] Published Tue Feb 21, 2017

]]>We implement faster-than-adiabatic two-qubit phase gates using smooth state-dependent forces. The forces are designed to leave no final motional excitation, independently of the initial motional state in the harmonic small-oscillations limit. They are simple, explicit functions of time and the desir…

[Phys. Rev. A 95, 022328] Published Tue Feb 21, 2017

]]>L. Lamata *et al.* use an inductive approach to classify the entangled pure states of four qubits under stochastic local operations and classical communication (SLOCC) [Phys. Rev. A **75**, 022318 (2007)]. The inductive method yields *a priori* ten entanglement superclasses, of which they discard three as e…

[Phys. Rev. A 95, 022329] Published Tue Feb 21, 2017

]]>The role of entanglement and quantum correlations in complex physical systems and quantum information processing devices has become a topic of intense study in the past two decades. In this work we present tools for learning about entanglement and quantum correlations in dynamical systems where the …

[Phys. Rev. A 95, 022330] Published Tue Feb 21, 2017

]]>Using *ab initio* methodologies, we investigate the lowest electronic states of ${\mathrm{AlS}}^{2+}$ dications. These computations are performed using standard and explicitly correlated methods. Here we predict the metastability of this particular dication, where several potential wells are located. For the bound st…

[Phys. Rev. A 95, 022508] Published Tue Feb 21, 2017

]]>Multiphoton free-free transitions were observed in laser-assisted elastic electron scattering (LAES) by Xe atoms in a femtosecond near-infrared intense laser field. The distinct peak structures at the energy shifts of $n$-photons $(n=+1,+2,+3,+4,+5$, and $+6)$ were identified in the observed energy spectr…

[Phys. Rev. A 95, 023414] Published Tue Feb 21, 2017

]]>Aiming at efficient numerical analysis of time-dependent (TD) many-electron dynamics of atoms involving multielectron continua, the TD restricted-active-space self-consistent-field theory with space partition (TD-RASSCF-SP) is presented. The TD-RASSCF-SP wave function is expanded in terms of TD conf…

[Phys. Rev. A 95, 023415] Published Tue Feb 21, 2017

]]>We propose a coupled Dirac sea approach to examine numerically the electron-positron pair creation process with interfermionic interactions in a supercritical background field. In this approach the Hilbert space is doubled, leading to two separate Dirac equations for the dynamics of the electrons an…

[Phys. Rev. A 95, 023416] Published Tue Feb 21, 2017

]]>The manipulation of neutral atoms and molecules via their de Broglie wave properties, also referred to as de Broglie matter wave optics, is relevant for several fields ranging from fundamental quantum mechanics tests and quantum metrology to measurements of interaction potentials and new imaging tec…

[Phys. Rev. A 95, 023618] Published Tue Feb 21, 2017

]]>We present a theoretical study based upon quantum Monte Carlo methods of the Bose polaron in one-dimensional systems with contact interactions. In this instance of the problem of a single impurity immersed in a quantum bath, the medium is a Lieb-Liniger gas of bosons ranging from the weakly interact…

[Phys. Rev. A 95, 023619] Published Tue Feb 21, 2017

]]>In this paper, a Bose-Hubbard extension of a Weyl semimetal is proposed that can be realized for ultracold atoms using laser-assisted tunneling and Feshbach resonance technique in three-dimensional optical lattices. The global phase diagram is obtained consisting of a superfluid phase and various Mo…

[Phys. Rev. A 95, 023620] Published Tue Feb 21, 2017

]]>We present a quantum theory for a fully coupled hybrid optomechanical system where all mutual couplings between a two-level atom, a confined photon mode, and a mechanical oscillator mode are considered. In such a configuration, new quantum interference effects and correlations arise due to the inter…

[Phys. Rev. A 95, 023832] Published Tue Feb 21, 2017

]]>We present a physical setup for realizing all-real-spectrum optical potentials with arbitrary gain-and-loss distributions in a coherent medium consisting of a cold three-level atomic gas driven by control and probe laser fields. We show that by the interference of Raman resonances and the Stark shif…

[Phys. Rev. A 95, 023833] Published Tue Feb 21, 2017

]]>A scheme for certifying an unbounded amount of random bits from a single pair of entangled qubits is proposed in the scenario where one of the qubits is subjected to a sequence of nonprojective measurements, which supersedes the limit of the finite amount of randomness that can be certified in a traditional two-party, single-measurement Bell scenario.

[Phys. Rev. A 95, 020102(R)] Published Fri Feb 17, 2017

]]>We consider the quantum harmonic oscillator in contact with a finite-temperature bath, modeled by the Caldeira-Leggett master equation. Applying periodic kicks to the oscillator, we study the system in different dynamical regimes between classical integrability and chaos, on the one hand, and ballis…

[Phys. Rev. A 95, 022118] Published Fri Feb 17, 2017

]]>To explain the conceptual gap between classical and quantum and other, hypothetical descriptions of the world, several principles have been proposed. So far, all these principles have not explicitly included the uncertainty relation. Here we introduce an information content principle (*ICP*) which rep…

[Phys. Rev. A 95, 022119] Published Fri Feb 17, 2017

]]>We present a study of the ultrafast dissociation dynamics of the lowest-lying electronic excited states in ${\mathrm{CO}}_{2}$ by using ultraviolet (UV) and extreme-ultraviolet (XUV) pulses from high-order harmonic generation. We observe two primary dissociation channels: a direct dissociation channel along the ${}^{1}{\mathrm{\Pi}}_{g}$…

[Phys. Rev. A 95, 023412] Published Fri Feb 17, 2017

]]>Photoelectron angular distributions from helium atoms are measured using the circularly polarized extreme ultraviolet (XUV) vortex produced by a helical undulator as the higher harmonics of its radiation. The XUV vortex has a helical wave front and carries orbital angular momentum as well as the spi…

[Phys. Rev. A 95, 023413] Published Fri Feb 17, 2017

]]>In this paper we study the coarsening dynamics of a spinor condensate quenched into an easy-axis ferromagnetic phase by a sudden change in the quadratic Zeeman energy. We show that applying a spin rotation prior to changing the Zeeman energy accelerates the development of local order and reduces hea…

[Phys. Rev. A 95, 023616] Published Fri Feb 17, 2017

]]>We show that an ansatz based on independent composite bosons [Phys. Rep. **463**, 215 (2008)] accurately describes the condensate fraction of molecular Bose-Einstein condensates in ultracold Fermi gases. The entanglement between the fermionic constituents of a single Feshbach molecule then governs the m…

[Phys. Rev. A 95, 023617] Published Fri Feb 17, 2017

]]>[Phys. Rev. A 95, 029902] Published Fri Feb 17, 2017

]]>The quantum-mechanical calculations of the differential and integrated cross sections of the elastic scattering, Stark transitions, and Coulomb deexcitation at collisions of excited ${\mu}^{-}p$ and ${\mu}^{-}d$ atoms with hydrogen isotope atoms in the ground state are performed. The scattering processes are treated …

[Phys. Rev. A 95, 022506] Published Thu Feb 16, 2017

]]>Fr atom can be successively used to search for the atomic permanent electric dipole moment (EDM) [Hyperfine Interact. **236**, 53 (2015); J. Phys.: Conference Series **691**, 012017 (2016)]. It can be induced by the permanent electron EDM predicted by modern extensions of the standard model to be nonzero at…

[Phys. Rev. A 95, 022507] Published Thu Feb 16, 2017

]]>In this article we provide a general analysis of canonical quantization for polaritons in dispersive and dissipative electromagnetic inhomogeneous media. We compare several approaches based either on the Huttner-Barnett model [B. Huttner and S. M. Barnett, Phys. Rev. A **46**, 4306 (1992)] or the Green …

[Phys. Rev. A 95, 023831] Published Thu Feb 16, 2017

]]>Entanglement-assisted classical communication and transmission of a quantum system are the two quantum resources for information processing. Many information tasks can be performed using either quantum resource. However, this equivalence is not always present since entanglement-assisted classical co…

[Phys. Rev. A 95, 020302(R)] Published Wed Feb 15, 2017

]]>In classical computational chemistry, the coupled-cluster ansatz is one of the most commonly used *ab initio* methods, which is critically limited by its nonunitary nature. The unitary modification as an ideal solution to the problem is, however, extremely inefficient in classical conventional computa…

[Phys. Rev. A 95, 020501(R)] Published Wed Feb 15, 2017

]]>We consider electron impact-driven single and double ionization of magnesium in the energy range of 10 to 100 eV. Our classical Hamiltonian model of these $(e,2e)$ and $(e,3e)$ processes sheds light on their total cross sections and reveals the underlying ionization mechanisms. Two pathways are at play …

[Phys. Rev. A 95, 022713] Published Wed Feb 15, 2017

]]>We consider a quantum system periodically driven with a strength which varies slowly on the scale of the driving period. The analysis is based on a general formulation of the Floquet theory relying on the extended Hilbert space. It is shown that the dynamics of the system can be described in terms o…

[Phys. Rev. A 95, 023615] Published Wed Feb 15, 2017

]]>Slow-light media are of interest in the context of quantum computing and enhanced measurement of quantum effects, with particular emphasis on using slow light with single photons. We use light-in-flight imaging with a single-photon avalanche diode camera array to image *in situ* pulse propagation thro…

[Phys. Rev. A 95, 023830] Published Wed Feb 15, 2017

]]>[Phys. Rev. A 95, 029901] Published Wed Feb 15, 2017

]]>In this paper, we introduce an alternative quantum fidelity for quantum states which perfectly satisfies all of Jozsa's axioms and is zero for orthogonal states. By employing this fidelity, we derive an improved bound for quantum-speed-limit time in open quantum systems in which the initial states c…

[Phys. Rev. A 95, 022115] Published Tue Feb 14, 2017

]]>Nonlocality is one of the main characteristic features of quantum systems involving more than one spatially separated subsystem. It is manifested theoretically as well as experimentally through violation of some *local realistic* inequality. On the other hand, classical behavior of all physical phenom…

[Phys. Rev. A 95, 022116] Published Tue Feb 14, 2017

]]>The Hamilton operator of an open quantum system is non-Hermitian. Its eigenvalues are generally complex and provide not only the energies but also the lifetimes of the states of the system. The states may couple via the common environment of scattering wave functions into which the system is embedde…

[Phys. Rev. A 95, 022117] Published Tue Feb 14, 2017

]]>We discuss the possibility of protecting the state of a quantum system that goes through noise by measurements and operations before and after the noise process. The aim is to seek the optimal protocol that makes the input and output states as close as possible and to clarify the role of the measure…

[Phys. Rev. A 95, 022321] Published Tue Feb 14, 2017

]]>Mechanical resonators represent one of the most promising candidates to mediate the interaction between different quantum technologies, bridging the gap between efficient quantum computation and long-distance quantum communication. Here, we introduce an interferometric scheme where the interaction o…

[Phys. Rev. A 95, 022322] Published Tue Feb 14, 2017

]]>We have measured the yield for the photoproduction of singly and doubly charged parent ions of the inorganic molecule tribromoborazine [(BrBNH)${}_{3}]$, a molecule in which three bromine atoms replace three hydrogen atoms in borazine [(BH)${}_{3}$(NH)${}_{3}]$. Borazine is isoelectronic and isostructural to benzene. We…

[Phys. Rev. A 95, 023408] Published Tue Feb 14, 2017

]]>We present a study of high-order-harmonic generation (HHG) assisted by extreme ultraviolet (XUV) attosecond pulses, which can lead to the excitation of inner-shell electrons and the generation of a second HHG plateau. With the treatment of a one-dimensional model of krypton, based on time-dependent …

[Phys. Rev. A 95, 023409] Published Tue Feb 14, 2017

]]>When atomic gases are laser driven to Rydberg states in an off-resonant way, a single Rydberg atom may enhance the excitation rate of surrounding atoms. This leads to a facilitated excitation referred to as Rydberg antiblockade. In the *usual facilitation* scenario, the detuning of the laser from reso…

[Phys. Rev. A 95, 023410] Published Tue Feb 14, 2017

]]>We investigate sequential double ionization of helium by intense near-circularly polarized few-cycle laser pulses using a semiclassical ionization model with two independent electrons. Simulated ${\mathrm{He}}^{2+}$ ion momentum distributions are compared to those obtained in recent benchmark experiments [M. S. Sch…

[Phys. Rev. A 95, 023411] Published Tue Feb 14, 2017

]]>We describe the dynamical preparation of magnetic states in a strongly interacting two-component Bose gas in a harmonic trap. By mapping this system to an effective spin-chain model, we obtain the dynamical spin densities and the fidelities for a few-body system. We show that the spatial profiles tr…

[Phys. Rev. A 95, 023612] Published Tue Feb 14, 2017

]]>Using extensive quantum Monte Carlo simulations, we study a minimum model of interacting hard-core bosons on a square lattice with hoppings of different lengths, featuring nearest-neighbor hopping (${t}_{1}$), anisotropic next-nearest-neighbor hopping (${t}_{2}^{\prime}$), and nearest-neighbor repulsion (${V}_{1}$). The paradig…

[Phys. Rev. A 95, 023613] Published Tue Feb 14, 2017

]]>We rigorously analyze the low-temperature properties of homogeneous three-dimensional two-component Bose mixture with dipole-dipole interaction. For such a system the effective hydrodynamic action that governs the behavior of low-energy excitations is derived. The infrared structure of the exact sin…

[Phys. Rev. A 95, 023614] Published Tue Feb 14, 2017

]]>An appropriate wave-front design will enable light fields that propagate along arbitrary trajectories, thus forming accelerating beams in free space. Previous strategies for designing such accelerating beams rely mainly on caustic methods, which start from diffraction integrals and deal only with tw…

[Phys. Rev. A 95, 023825] Published Tue Feb 14, 2017

]]>Analysis of the group-velocity dispersion (GVD) of atmospheric air with a model that includes the entire manifold of infrared transitions in air reveals a remarkably broad and continuous anomalous-GVD region in the high-frequency wing of the carbon dioxide rovibrational band from approximately 3.5 t…

[Phys. Rev. A 95, 023826] Published Tue Feb 14, 2017

]]>In the existing parity-time ($\mathcal{PT}$) symmetry with the balanced gain and loss, the gain is derived from semiclassical but not full quantum theories, which significantly restricts the applications of $\mathcal{PT}$ symmetry in quantum fields. In this work, we propose and analyze a theoretical scheme to realize full …

[Phys. Rev. A 95, 023827] Published Tue Feb 14, 2017

]]>A cavity quantum electrodynamical scenario is proposed for implementing a Schrödinger microscope capable of amplifying differences between nonorthogonal atomic quantum states. The scheme involves an ensemble of identically prepared two-level atoms interacting pairwise with a single mode of the radia…

[Phys. Rev. A 95, 023828] Published Tue Feb 14, 2017

]]>We explore the long-time dynamics of the quantum Rabi model in a driven-dissipative setting and show that, as the atom-cavity coupling strength becomes larger than the cavity frequency, a new time scale emerges. This time scale, much larger than the natural relaxation time of the atom and the cavity…

[Phys. Rev. A 95, 023829] Published Tue Feb 14, 2017

]]>Quantum measure theory (QMT) is a generalization of quantum theory where physical predictions are computed from a matrix known as the *decoherence functional* (DF). Previous works have noted that, in its original formulation, QMT exhibits a problem with composability, since the composition of two deco…

[Phys. Rev. A 95, 022114] Published Mon Feb 13, 2017

]]>Achieving information theoretic security with practical complexity is of great interest to continuous-variable quantum key distribution in the postprocessing procedure. In this paper, we propose a reconciliation scheme based on the punctured low-density parity-check (LDPC) codes. Compared to the wel…

[Phys. Rev. A 95, 022318] Published Mon Feb 13, 2017

]]>Unlike the Rydberg blockade regime, the Rydberg antiblockade regime (RABR) allows more than one Rydberg atom to be excited, which can bring other interesting phenomena and applications. We propose an alternative scheme to quickly achieve the RABR. The proposed RABR can be implemented by adjusting th…

[Phys. Rev. A 95, 022319] Published Mon Feb 13, 2017

]]>In this study, we propose the concept of judgment space to investigate the quantum-secret-sharing scheme based on local distinguishability (called LOCC-QSS). Because of the proposing of this conception, the property of orthogonal mutiqudit entangled states under restricted local operation and classi…

[Phys. Rev. A 95, 022320] Published Mon Feb 13, 2017

]]>We carry out a complete derivation on nonrelativistic energies of atomic Rydberg states, including finite nuclear mass corrections. Several missing terms are found and a discrepancy is confirmed in the works of Drachman [in *Long Range Casimir Forces: Theory and Recent Experiments on Atomic Systems*, …

[Phys. Rev. A 95, 022505] Published Mon Feb 13, 2017

]]>Pairwise additive potentials for multielectronic atoms interacting with a LiF(001) surface are revisited by including an improved description of the electron density associated with the different lattice sites, as well as nonlocal electron density contributions. Within this model, the electron distr…

[Phys. Rev. A 95, 022710] Published Mon Feb 13, 2017

]]>We present measurements of ion-pair dissociation (IPD) of highly excited neutral and ionized carbon clusters ${\mathrm{C}}_{n=2-5}^{(q=0-3)+}$. The tool for producing these species was a high-velocity collision between ${\mathrm{C}}_{n}^{+}$ projectiles ($v=2.25$ a.u.) and helium atoms. The setup allowed us to detect in coincidence anioni…

[Phys. Rev. A 95, 022711] Published Mon Feb 13, 2017

]]>We report a measurement of $KLL$ dielectronic recombination in charge states from ${\mathrm{Kr}}^{+34}$ through ${\mathrm{Kr}}^{+28}$ in order to investigate the contribution of the Breit interaction for a wide range of resonant states. Highly charged Kr ions were produced in an electron-beam ion trap, while the electron-ion collisi…

[Phys. Rev. A 95, 022712] Published Mon Feb 13, 2017

]]>The analysis of the quantum Hall response of a small system of interacting ultracold bosonic atoms through the variation of its Hall resistivity against the applied gauge magnetic field provides a powerful method to unmask its strongly correlated states in a quite exhaustive way. Within a fixed rang…

[Phys. Rev. A 95, 023609] Published Mon Feb 13, 2017

]]>To study the full counting statistics of quantum heat transfer in a driven nonequilibrium spin-boson model, we develop a generalized nonequilibrium polaron-transformed Redfield equation with an auxiliary counting field. This enables us to study the impact of qubit-bath coupling ranging from weak to …

[Phys. Rev. A 95, 023610] Published Mon Feb 13, 2017

]]>We propose a simple experimental scheme to realize simultaneously the one-dimensional spin-orbit coupling and the staggered spin flip in ultracold pseudospin-$1/2$ atomic Fermi gases trapped in optical lattices. In the absence of interspecies interactions, the system supports type-I and II Weyl semime…

[Phys. Rev. A 95, 023611] Published Mon Feb 13, 2017

]]>We discuss the propagation of an electromagnetic field in an inhomogeneously anisotropic material where the optic axis is rotated in the transverse plane but is invariant along the propagation direction. In such a configuration, the evolution of an electromagnetic wave packet is governed by the Panc…

[Phys. Rev. A 95, 023823] Published Mon Feb 13, 2017

]]>Squeezed-state interferometry plays an important role in quantum-enhanced optical phase estimation, as it allows the estimation precision to be improved up to the Heisenberg limit by using ideal photon-number-resolving detectors at the output ports. Here we show that for each individual $N$-photon com…

[Phys. Rev. A 95, 023824] Published Mon Feb 13, 2017

]]>Due to the dominant electron capture by positrons from the molecular shell and the spatial dephasing across the shell width, a powerful diffraction effect universally underlies the positronium (Ps) formation from fullerenes. This results in trains of resonances in the Ps formation cross section as a…

[Phys. Rev. A 95, 020701(R)] Published Fri Feb 10, 2017

]]>We demonstrate Rabi oscillations in nonlinear ionization of argon by an intense femtosecond extreme ultraviolet (XUV) laser field produced by high-harmonic generation. We monitor the formation of $\mathrm{A}{\mathrm{r}}^{2+}$ as a function of the time delay between the XUV pulse and an additional near-infrared (NIR) femtose…

[Phys. Rev. A 95, 021401(R)] Published Fri Feb 10, 2017

]]>A frequency estimation scheme is developed to handle systems characterized by nonergodic dynamics, where standard statistical methods fail. Instead of the conventional Cramér-Rao bound of parameter estimation, here a Lévy statistical analysis yields the scaling of error estimation.

[Phys. Rev. A 95, 022110] Published Fri Feb 10, 2017

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