We present a technique for hyperentangled Bell-state analysis that only relies on linear optics and is assisted by auxiliary entangled states. This technique can be used to implement hyperdense coding with an experimentally realizable two-photon state hyperentangled in polarization and two longitudi...

[Phys. Rev. A 96, 020303(R)] Published Mon Aug 21, 2017

]]>This work explores the notion of inter-convertibility between a cryptographic primitive: the random access code (RAC) and bipartite no-signaling nonlocal resources. To this end we introduce two generalizations of the Popescu-Rohrlich box (PR) and investigate their relation with the corresponding RAC...

[Phys. Rev. A 96, 022125] Published Mon Aug 21, 2017

]]>We analyze Vaidman's three-path interferometer with weak path marking [L. Vaidman, Phys. Rev. A **87**, 052104 (2013)] and find that common sense yields correct statements about the particle's path through the interferometer. This disagrees with the original claim that the particles have discontinuous t...

[Phys. Rev. A 96, 022126] Published Mon Aug 21, 2017

]]>The measurement of dynamic correlation functions of quantum systems is complicated by measurement backaction. To facilitate such measurements we introduce a protocol, based on weak ancilla-system couplings, that is applicable to arbitrary (pseudo)spin systems and arbitrary equilibrium or nonequilibr...

[Phys. Rev. A 96, 022127] Published Mon Aug 21, 2017

]]>In quantum information, $W$ states are a central class of multipartite entangled states because of their robustness against noise and their use in many quantum processes. Their generation, however, remains a demanding task whose difficulty increases with the number of particles. We report a simple sca...

[Phys. Rev. A 96, 022319] Published Mon Aug 21, 2017

]]>The survival of Gaussian quantum states in a turbulent atmospheric channel is of crucial importance in free-space continuous-variable (CV) quantum key distribution (QKD), in which the transmission coefficient will fluctuate in time, thus resulting in non-Gaussian quantum states. Different from quant...

[Phys. Rev. A 96, 022320] Published Mon Aug 21, 2017

]]>We study the effect of Efimov physics (in the few-body sector) on the spectral response of the Bose polaron, a many-body system consisting of an impurity immersed in a bath of bosonic atoms. We find that the Efimov correlation can be greatly enhanced by increasing the mass ratio between the bosons a...

[Phys. Rev. A 96, 022707] Published Mon Aug 21, 2017

]]>Nanoparticle assisted high-order-harmonic generation by low-intensity ultrashort laser pulses in hydrogen atomic gas is studied. This work is based on surface plasmon-polariton coupling in metal-insulator-metal structures. The necessary laser intensity is provided by enhancement of the incident lase...

[Phys. Rev. A 96, 023415] Published Mon Aug 21, 2017

]]>Trapping cold, chemically important molecules with electromagnetic fields is a useful technique to study small molecules and their interactions. Traps provide long interaction times, which are needed to precisely examine these low-density molecular samples. However, the trapping fields lead to nonun...

[Phys. Rev. A 96, 023416] Published Mon Aug 21, 2017

]]>We measure photoelectron momentum spectra from above-threshold ionization of Xe atoms in a linearly polarized two-color laser field with comparable intensities. The spectra show distinct forward-backward asymmetries along the laser polarization direction, which depend sensitively on the electron emi...

[Phys. Rev. A 96, 023417] Published Mon Aug 21, 2017

]]>We investigate a procedure to generate turbulence in a trapped Bose-Einstein condensate which takes advantage of the decay of multicharged vortices to reduce surface oscillations. We show that the resulting singly charged vortices twist around each other, intertwined in the shape of helical Kelvin w...

[Phys. Rev. A 96, 023617] Published Mon Aug 21, 2017

]]>The wave-front aberration of Raman beams induces phase noise in atom interferometers and thus limits the performance of atom interferometers. We theoretically analyze the wave-front-aberration phase noise in weak-equivalence-principle tests using dual-species atom interferometers, and propose an exp...

[Phys. Rev. A 96, 023618] Published Mon Aug 21, 2017

]]>We propose a theoretical scheme for implementing nonleaky and accelerated population transfer with a transmon qutrit. For a transmon-regime artificial atom with weak level anharmonicity, the leakage effects on the target population transfer are considerable. Allowed by the level-transition rule, a t...

[Phys. Rev. A 96, 023843] Published Mon Aug 21, 2017

]]>We present a simulation study of terahertz radiation from a gas driven by two-color laser pulses in a broad range of frequency ratios ${\omega}_{1}/{\omega}_{0}$. Our particle-in-cell simulation results show that there are three series with ${\omega}_{1}/{\omega}_{0}=2n,n+1/2,n\pm 1/3$ ($n$ is a positive integer) for high-efficiency and stable r...

[Phys. Rev. A 96, 023844] Published Mon Aug 21, 2017

]]>By using unbiased continuous-space quantum Monte Carlo simulations, we investigate the ground-state properties of a one-dimensional repulsive Fermi gas subjected to a commensurate periodic optical lattice (OL) of arbitrary intensity. The equation of state and the magnetic structure factor are determ...

[Phys. Rev. A 96, 021601(R)] Published Fri Aug 18, 2017

]]>We herein report the experimental demonstration of adaptive quantum state estimation for totally unknown photonic qubits. Similar to our previous study [R. Okamoto *et al.*, Phys. Rev. Lett. **109**, 130404 (2012)], the measurement configuration is updated using the results of each photon detection event...

[Phys. Rev. A 96, 022124] Published Fri Aug 18, 2017

]]>Multiplexing is a strategy to augment the transmission capacity of a communication system. It consists of combining multiple signals over the same data channel and it has been very successful in classical communications. However, the use of enhanced channels has only reached limited practicality in ...

[Phys. Rev. A 96, 022317] Published Fri Aug 18, 2017

]]>Recently, sequential state discrimination, as a quantum-key distribution protocol, has been proposed for multiple receivers. A previous study [J. A. Bergou *et al.*, Phys. Rev. Lett. **111**, 100501 (2013)] showed that every receiver could successfully perform a sequential state discrimination of two pur...

[Phys. Rev. A 96, 022318] Published Fri Aug 18, 2017

]]>In this paper, we report the relativistic Fock space multireference coupled-cluster method for atomic structure calculations. We use the no-pair Dirac-Coulomb-Breit Hamiltonian, together with a finite $B$-spline basis set to expand the large and small components of the Dirac wave function. Our method ...

[Phys. Rev. A 96, 022513] Published Fri Aug 18, 2017

]]>Magnetically tunable Feshbach resonances in ultracold atomic systems are chiefly identified and characterized through time-consuming atom loss spectroscopy. We describe an off-resonant dispersive optical probing technique to rapidly locate Feshbach resonances and demonstrate the method by locating f...

[Phys. Rev. A 96, 022705] Published Fri Aug 18, 2017

]]>We calculate the kinetic-energy release distributions of fragments produced for electron-impact dissociation of the vibrationally excited molecular hydrogen ion ${{\mathrm{H}}_{2}}^{+}$ and its isotopologues ${{\mathrm{D}}_{2}}^{+}$ and ${{\mathrm{T}}_{2}}^{+}$. Here we apply the adiabatic-nuclei convergent close-coupling method and compare results with several...

[Phys. Rev. A 96, 022706] Published Fri Aug 18, 2017

]]>We present an analytic solution of bound states in the continuum (BICs) for photons and atoms in a one-dimensional coupled-cavity array. These bound states are formed by two ensembles of two-level atoms confined in separated cavities of the array. We show that in the regime where the photon hopping ...

[Phys. Rev. A 96, 023842] Published Fri Aug 18, 2017

]]>We demonstrate control over the localization of high-lying Rydberg wave packets in argon atoms with phase-locked orthogonally polarized two-color laser fields. With a reaction microscope, we measure ionization signals of high-lying Rydberg states induced by a weak dc field and blackbody radiation as...

[Phys. Rev. A 96, 021403(R)] Published Thu Aug 17, 2017

]]>We construct ($d\times d$)-dimensional bound entangled states, which violate, for any $d>2$, a bipartite Bell inequality introduced in this paper. We conjecture that the proposed class of Bell inequalities acts as a dimension witness for bound entangled states: For any $d>2$ there exists a Bell inequality...

[Phys. Rev. A 96, 022123] Published Thu Aug 17, 2017

]]>Decoy-state quantum key distribution (QKD) is a standard tool for long-distance quantum communications. An important issue in this field is processing the decoy-state statistics taking into account statistical fluctuations (or “finite-key effects”). In this work, we propose and analyze an option for...

[Phys. Rev. A 96, 022316] Published Thu Aug 17, 2017

]]>High-precision calculations of the ground-state ionization energies that include QED effects are performed for five-electron, boronlike ions with the nuclear charge numbers between 16 and 96. The inclusion of nuclear recoil and nuclear polarization effects further allows for a meaningful comparison to future experimental measurements.

[Phys. Rev. A 96, 022512] Published Thu Aug 17, 2017

]]>We present a theoretical study of ionization of the hydrogen atom due to an XUV pulse in the presence of an infrared (IR) laser with both fields linearly polarized in the same direction. In particular, we study the energy distribution of photoelectrons emitted perpendicularly to the polarization dir...

[Phys. Rev. A 96, 023414] Published Thu Aug 17, 2017

]]>We investigate the time evolution of the entanglement entropy of coupled single-mode Bose-Einstein condensates in a double-well potential at $T=0$ temperature by combining numerical results with analytical approximations. We find that the coherent oscillations of the condensates result in entropy osci...

[Phys. Rev. A 96, 023615] Published Thu Aug 17, 2017

]]>We model a sonic black-hole analog in a quasi-one-dimensional Bose-Einstein condensate, using a Gross-Pitaevskii equation matching the configuration of a recent experiment by Steinhauer [Nat. Phys. **10**, 864 (2014)]. The model agrees well with important features of the experimental observations, demon...

[Phys. Rev. A 96, 023616] Published Thu Aug 17, 2017

]]>We explore theoretically the nonequilibrium photonic phases of an array of coupled cavities in presence of incoherent driving and dissipation. In particular, we consider a Hubbard model system where each site is a Kerr nonlinear resonator coupled to a two-level emitter, which is pumped incoherently....

[Phys. Rev. A 96, 023839] Published Thu Aug 17, 2017

]]>We demonstrate a kind of aperiodic photonic structure realized using the interference of multiple Mathieu-Gauss beams. Depending on the beam configurations, their mutual distances, angles of rotation, or phase relations we are able to observe different classes of such aperiodic optically induced ref...

[Phys. Rev. A 96, 023840] Published Thu Aug 17, 2017

]]>Reflectionless potentials for classical or matter waves represent an important class of scatteringless systems encountered in different areas of physics. Here we mathematically demonstrate that there is a family of non-Hermitian potentials that, in contrast to their Hermitian counterparts, remain re...

[Phys. Rev. A 96, 023841] Published Thu Aug 17, 2017

]]>In Phys. Lett. A **166**, 293 (1992), Popescu and Rohrlich characterized nonlocality of pure $n$-partite entangled systems by studying bipartite violation of local realism when $n-2$ number of parties perform projective measurements on their particles. A pertinent question in this scenario is whether simila...

[Phys. Rev. A 96, 022122] Published Wed Aug 16, 2017

]]>We study the probabilistic (conditional) teleportation protocol when the entanglement needed for its implementation is given by thermal entanglement, i.e., when the entangled resource connecting Alice and Bob is an entangled mixed state described by the canonical ensemble density matrix. Specificall...

[Phys. Rev. A 96, 022315] Published Wed Aug 16, 2017

]]>Balanced gain and loss renders the mean-field description of Bose-Einstein condensates $\mathcal{PT}$ symmetric. However, any experimental realization has to deal with unbalancing in the gain and loss contributions breaking the $\mathcal{PT}$ symmetry. We will show that such an asymmetry does not necessarily lead to a syst...

[Phys. Rev. A 96, 023614] Published Wed Aug 16, 2017

]]>Quantum illumination (QI) is an entanglement-enhanced sensing system whose performance advantage over a comparable classical system survives its usage in an entanglement-breaking scenario plagued by loss and noise. In particular, QI's error-probability exponent for discriminating between equally lik...

[Phys. Rev. A 96, 020302(R)] Published Tue Aug 15, 2017

]]>We introduce a feature of no-signaling (Bell) nonlocal theories: namely, when a system of multiple parties manifests genuine nonlocal correlation, then there cannot be arbitrarily high nonlocal correlation among any subset of the parties. We call this feature complementarity of genuine multipartite ...

[Phys. Rev. A 96, 022121] Published Tue Aug 15, 2017

]]>We introduce a simple yet versatile protocol to inverse engineer the time-dependent Hamiltonian in two- and three-level systems. In the protocol, by utilizing a universal SU(2) transformation, a given speedup goal can be obtained with large freedom to select the control parameters. As an illustratio...

[Phys. Rev. A 96, 022314] Published Tue Aug 15, 2017

]]>Spontaneous avalanche to plasma splits the core of an ellipsoidal Rydberg gas of nitric oxide. Ambipolar expansion first quenches the electron temperature of this core plasma. Then, long-range, resonant charge transfer from ballistic ions to frozen Rydberg molecules in the wings of the ellipsoid que...

[Phys. Rev. A 96, 023613] Published Tue Aug 15, 2017

]]>We present a systematic treatment of higher-order modes of vacuum-clad ultrathin optical fibers. We show that, for a given fiber, the higher-order modes have larger penetration lengths, larger effective mode radii, and larger fractional powers outside the fiber than the fundamental mode. We calculat...

[Phys. Rev. A 96, 023835] Published Tue Aug 15, 2017

]]>The entanglement between photon pairs generated from the biexciton cascade transition in a semiconductor quantum dot located in the vicinity of a metal nanoparticle is theoretically investigated. In the model scheme, the biexciton-exciton and exciton–ground-state transitions are assumed to be couple...

[Phys. Rev. A 96, 023836] Published Tue Aug 15, 2017

]]>A scheme is presented for the adiabatic transfer of average fluctuations in the phonon number between two membranes in an optical cavity. We show that by driving the cavity modes with external time-delayed pulses, one can obtain an effect analogous to stimulated Raman adiabatic passage in the atomic...

[Phys. Rev. A 96, 023837] Published Tue Aug 15, 2017

]]>We studied the second-order correlation function of computational ghost imaging, and we gave the expressions of second-order correlation function in the signal and background region. We found the total intensity of the modulated source influences the visibility of the reconstructed image. We discuss...

[Phys. Rev. A 96, 023838] Published Tue Aug 15, 2017

]]>[Phys. Rev. A 96, 029902] Published Tue Aug 15, 2017

]]>Markovian master equations (formally known as quantum dynamical semigroups) can be used to describe the evolution of a quantum state $\rho $ when in contact with a memoryless thermal bath. This approach has had much success in describing the dynamics of real-life open quantum systems in the laboratory. Su...

[Phys. Rev. A 96, 022118] Published Mon Aug 14, 2017

]]>We study quantum many-body states of particles subject to a more general exchange symmetry than the behavior under pairwise exchange obeyed by bosons and fermions. We refer to these hypothetical particles as *immanons* because the scalar product of states with the generalized exchange symmetry is the ...

[Phys. Rev. A 96, 022119] Published Mon Aug 14, 2017

]]>The Salecker-Wigner-Peres (SWP) clock is often used to determine the duration a quantum particle is supposed to spend in a specified region of space $\mathrm{\Omega}$. By construction, the result is a real positive number, and the method seems to avoid the difficulty of introducing complex time parameters, which ar...

[Phys. Rev. A 96, 022120] Published Mon Aug 14, 2017

]]>The state of a continuously monitored qubit evolves stochastically, exhibiting competition between coherent Hamiltonian dynamics and diffusive partial collapse dynamics that follow the measurement record. We couple these distinct types of dynamics together by linearly feeding the collected record fo...

[Phys. Rev. A 96, 022311] Published Mon Aug 14, 2017

]]>We consider the problem of minimum-error quantum state discrimination for single-qubit mixed states. We present a method which uses the Helstrom conditions constructively and analytically; this algebraic approach is complementary to existing geometric methods, and solves the problem for any number o...

[Phys. Rev. A 96, 022312] Published Mon Aug 14, 2017

]]>We consider three modes $A$, $B$, and $C$ and derive monogamy inequalities that constrain the distribution of bipartite continuous variable Einstein-Podolsky-Rosen entanglement amongst the three modes. The inequalities hold without the assumption of Gaussian states, and are based on measurements of the qu...

[Phys. Rev. A 96, 022313] Published Mon Aug 14, 2017

]]>Small positively charged gold clusters have been found to emit thermal radiation at a very high rate, with time constants ranging from one to $35\phantom{\rule{0.16em}{0ex}}\mu \mathrm{s}$ for ${{\mathrm{Au}}_{n}}^{+}$ ($n=6\text{\u2013}13,15$). For sizes $n=14,16\text{\u2013}20$ the radiation occurs on much longer time scales. Strong thermal suppression of the population of higher-lying ...

[Phys. Rev. A 96, 022511] Published Mon Aug 14, 2017

]]>We propose to build a bad-cavity laser using forbidden transitions in large ensembles of cold ions that form a Coulomb crystal in a linear Paul trap. This laser might realize an active optical frequency standard able to serve as a local oscillator in next-generation optical clock schemes. In passive...

[Phys. Rev. A 96, 023412] Published Mon Aug 14, 2017

]]>The exact time-evolution operator of an atom in the presence of a strong laser field is expressed using the phase-space path integral. Presenting this result in the form of a perturbative expansion in the effective interaction of the electron with the rest of the atom enables straightforward derivat...

[Phys. Rev. A 96, 023413] Published Mon Aug 14, 2017

]]>We propose a two-step experimental protocol to directly engineer Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in a cold two-component Fermi gas loaded into a quasi-one-dimensional trap. First, one uses phase imprinting to create a train of domain walls in a superfluid with equal number of $\uparrow $- and $\downarrow $...

[Phys. Rev. A 96, 023612] Published Mon Aug 14, 2017

]]>Within the second-quantization framework, we develop a formalism for describing a spatially multimode optical field diffracted through a spatial mask and show that this process can be described as an effective interaction between various spatial modes. We demonstrate a method to calculate the quantu...

[Phys. Rev. A 96, 023829] Published Mon Aug 14, 2017

]]>On the basis of a quantum microscopic approach we study the dynamics of the afterglow of a dilute Gaussian atomic ensemble excited by pulsed radiation. Taking into account the vector nature of the electromagnetic field we analyze in detail the angular and polarization distribution of single-photon s...

[Phys. Rev. A 96, 023830] Published Mon Aug 14, 2017

]]>We study the spontaneous decay of an impurity coupled to a linear array of bosonic cavities forming a single-band photonic waveguide. The average frequency of the emitted photon is different from the frequency for single-photon resonant scattering, which perfectly matches the bare frequency of the e...

[Phys. Rev. A 96, 023831] Published Mon Aug 14, 2017

]]>We propose a bosonic Josephson junction (BJJ) in two nonlinear mechanical resonators coupled through two-phonon exchange interaction induced by quadratic optomechanical couplings. The nonlinear dynamical equations and effective Hamiltonian are derived to describe behaviors of the BJJ. We show that t...

[Phys. Rev. A 96, 023832] Published Mon Aug 14, 2017

]]>Through rigorous simulations, the light scattering induced optical binding of one-dimensional (1D) dielectric photonic crystals is studied. The optical forces corresponding to the pass band, band gap, and band edge are qualitatively different. It is shown that light can induce self-organization of d...

[Phys. Rev. A 96, 023833] Published Mon Aug 14, 2017

]]>The novel effect of self-excitation of an atomic beam propagating above a metal surface is predicted and a theory is developed. Its underlying mechanism is positive feedback provided by the reflective surface for the atomic polarization. Under certain conditions the atomic beam flying in the near fi...

[Phys. Rev. A 96, 023834] Published Mon Aug 14, 2017

]]>ac Stark shifts of ultracold polar RbCs molecules are measured with hyperfine resolution. Due to coupling from the anisotropic component of the polarizability, the hyperfine levels of the first excited rotational state show an intricate pattern of avoided crossings as a function of laser intensity.

[Phys. Rev. A 96, 021402(R)] Published Fri Aug 11, 2017

]]>We show that two parties far apart can use shared entangled states and classical communication to align their coordinate systems with a very high fidelity. Moreover, compared with previous methods proposed for such a task, i.e., sending parallel or antiparallel pairs or groups of spin states, our me...

[Phys. Rev. A 96, 022310] Published Fri Aug 11, 2017

]]>We combined high-resolution Fourier-transform spectroscopy and large-scale electronic structure calculation to study energy and radiative properties of the high-lying $\left(3\right){}^{1}\mathrm{\Pi}$ and $\left(5\right){}^{1}\mathrm{\Sigma}^{+}$ states of the RbCs molecule. The laser-induced $\left(5\right){}^{1}\mathrm{\Sigma}^{+},\left(4\right){}^{1}\mathrm{\Sigma}^{+},\left(3\right){}^{1}\mathrm{\Pi}\to A\left(2\right){}^{1}\mathrm{\Sigma}^{+}\sim b\left(1\right){}^{3}\mathrm{\Pi}$ fluorescence (LIF) spectra were r...

[Phys. Rev. A 96, 022510] Published Fri Aug 11, 2017

]]>Collisions with background gas can perturb the transition frequency of trapped ions in an optical atomic clock. We develop a nonperturbative framework based on a quantum channel description of the scattering process and use it to derive a master equation which leads to a simple analytic expression f...

[Phys. Rev. A 96, 022704] Published Fri Aug 11, 2017

]]>We present a theoretical and experimental study of the angular and temperature dependence of the photon pairs produced by spontaneous parametric down-conversion in a periodically poled KTP crystal. In the experiment, two detectors are placed at different angles in the emitted light, and the detected...

[Phys. Rev. A 96, 023828] Published Fri Aug 11, 2017

]]>The light shift caused by an optical dipole force trap on a single ${}^{87}\mathrm{Rb}$ atom was recently studied by Shih and Chapman [Phys. Rev. A **87**, 063408 (2013)] using a dipole-matrix-element-based approach. A separate study by Neuzner *et al.* [Phys. Rev. A **92**, 053842 (2015)] considered the same system using a ...

[Phys. Rev. A 96, 027401] Published Fri Aug 11, 2017

]]>This reply is in response to the comment by Shea and Gauthier on our paper [Phys. Rev. A **87**, 063408 (2013)].

[Phys. Rev. A 96, 027402] Published Fri Aug 11, 2017

]]>It has recently been shown that it is possible to represent the complete quantum state of any system as a phase-space quasiprobability distribution (Wigner function) [Phys. Rev. Lett. **117**, 180401 (2016)]. Such functions take the form of expectation values of an observable that has a direct analogy t...

[Phys. Rev. A 96, 022117] Published Thu Aug 10, 2017

]]>We derive a versatile protocol to implement a fast and robust not quantum gate, driven by single-shot-shaped pulses with appropriate time-dependent phase and intensity profiles. The pulses are derived by combining analytic computations and numerical optimizations. We experimentally demonstrate the a...

[Phys. Rev. A 96, 022309] Published Thu Aug 10, 2017

]]>We report on the alteration of photon-emission properties of a single trapped ion coupled to a high-finesse optical fiber cavity. We show that the vacuum field of the cavity can simultaneously affect the emissions in both the infrared (IR) and ultraviolet (UV) branches of the $\mathrm{\Lambda}$-type level system of $\mathrm{...}$

[Phys. Rev. A 96, 023824] Published Thu Aug 10, 2017

]]>Periodic structures may grow in both conservative and dissipative systems. A multiplicity of examples can be found in nature and in the laboratory. However, periodic structures may grow and decay. We show that the effects of dissipation are essential for these structures to remain. Using the nonline...

[Phys. Rev. A 96, 023825] Published Thu Aug 10, 2017

]]>Optomagnonics and optomechanics have various applications, ranging from tunable light sources to optical manipulation for quantum information science. We propose a hybrid system based on the interaction between a phonon and a magnon that can be tuned by an electromagnetic field based on the radiatio...

[Phys. Rev. A 96, 023826] Published Thu Aug 10, 2017

]]>Hybrid spin-mechanical systems have great potential in sensing, macroscopic quantum mechanics, and quantum information science. In order to induce strong coupling between an electron spin and the center-of-mass motion of a mechanical oscillator, a large magnetic gradient usually is required, which i...

[Phys. Rev. A 96, 023827] Published Thu Aug 10, 2017

]]>We show that the paradox published by Saldanha and Vedral [Phys. Rev. A **87**, 042102 (2013)] is based on an improper interpretation of the localization probability density and a miscalculation of the wave functions. This Comment shows that there is no paradox as stated.

[Phys. Rev. A 96, 026101] Published Thu Aug 10, 2017

]]>Continuous-variable systems in quantum theory can be fully described through any one of the $s$-ordered family of quasiprobabilities ${\mathrm{\Lambda}}_{s}\left(\alpha \right),s\in [-1,1]$. We ask for what values of $(s,a)$ is the scaling map ${\mathrm{\Lambda}}_{s}\left(\alpha \right)\to {a}^{-2}{\mathrm{\Lambda}}_{s}\left({a}^{-1}\alpha \right)$ a positive map? Our analysis based on a duality we establish settles this issue: (i...

[Phys. Rev. A 96, 022114] Published Wed Aug 09, 2017

]]>Recent years have witnessed a rapidly growing interest in high-dimensional quantum entanglement for fundamental studies as well as towards novel applications. Therefore, the ability to verify entanglement between physical qudits, $d$-dimensional quantum systems, is of crucial importance. To show noncl...

[Phys. Rev. A 96, 022115] Published Wed Aug 09, 2017

]]>In the spirit of the thin-layer quantization approach, we give the formula of the geometric influences of a particle confined to a curved surface embedded in three-dimensional Euclidean space. The geometric contributions can result from the reduced commutation relation between the acted function dep...

[Phys. Rev. A 96, 022116] Published Wed Aug 09, 2017

]]>Currently, epsilon-near-zero (ENZ) materials have become important for controlling the propagation of light and enhancing by several orders of magnitude the Kerr and other nonlinearities. Given this advance it is important to examine the quantum electrodynamic processes and information tasks near EN...

[Phys. Rev. A 96, 022308] Published Wed Aug 09, 2017

]]>We study the question of existence, i.e., stability with respect to dissociation of the spin-quartet permutation- and reflection-symmetric ${}^{4}{(-3)}^{+}{}_{g}$ (${S}_{z}=-3/2,M=-3$) state of the $\left(\alpha \alpha eee\right)$ Coulomb system: the ${{\mathrm{He}}_{2}}^{+}$ molecular ion, placed in a magnetic field $0\le B\le 10\phantom{\rule{0.16em}{0ex}}000$ a.u. We assume that the $\alpha $ particles are ...

[Phys. Rev. A 96, 023410] Published Wed Aug 09, 2017

]]>We present a three-dimensional theoretical comparison between the radiation-pressure forces exerted on an atom in an isotropic light cooling scheme and in a six-beam molasses. We demonstrate that, in the case of a background vapor where all the space directions of the atomic motion have to be consid...

[Phys. Rev. A 96, 023411] Published Wed Aug 09, 2017

]]>We study the attractive Fermi mixture of a ${}^{6}\mathrm{Li}\text{\u2212}{}^{40}\mathrm{K}$ gas in one dimension using the continuous matrix product states variational ansatz and obtain the $T=0$ phase diagram. We predict an axial density profile that contains four distinct phases trapped induced along one-dimensional (1D) tubes, which is mo...

[Phys. Rev. A 96, 023609] Published Wed Aug 09, 2017

]]>It is known that, in the thermodynamic limit, the Chern number of a translationally invariant system cannot change under unitary time evolutions that are smooth in momentum space. Yet a real-space counterpart of the Chern number, the Bott index, has been shown to change in periodically driven system...

[Phys. Rev. A 96, 023610] Published Wed Aug 09, 2017

]]>We study the nonequilibrium quench dynamics of a one-dimensional anyonic gas. We focus on the integrable anyonic Lieb-Liniger model and consider the quench from noninteracting to hard-core anyons. We study the dynamics of the local properties of the system. By means of integrability-based methods, w...

[Phys. Rev. A 96, 023611] Published Wed Aug 09, 2017

]]>Spontaneous parametric down-conversion is a well-known process in quantum nonlinear optics in which a photon incident on a nonlinear crystal spontaneously splits into two photons. Here we propose an analogous physical process where one excited atom directly transfers its excitation to a pair of spat...

[Phys. Rev. A 96, 023818] Published Wed Aug 09, 2017

]]>We derive quantum trajectories (also known as stochastic master equations) that describe an arbitrary quantum system probed by a propagating wave packet of light prepared in a continuous-mode Fock state. We consider three detection schemes of the output light: photon counting, homodyne detection, an...

[Phys. Rev. A 96, 023819] Published Wed Aug 09, 2017

]]>In this work we first examine transverse and longitudinal fluxes in a $\mathcal{PT}$-symmetric photonic dimer using a coupled-mode theory. Several surprising understandings are obtained from this perspective: The longitudinal flux shows that the $\mathcal{PT}$ transition in a dimer can be regarded as a classical effect, de...

[Phys. Rev. A 96, 023820] Published Wed Aug 09, 2017

]]>Recently, the existence of robust three-dimensional light bullets (LBs) was predicted theoretically in the output of a laser coupled to a distant saturable absorber. In this paper, we analyze the stability and the range of existence of these dissipative localized structures and provide guidelines an...

[Phys. Rev. A 96, 023821] Published Wed Aug 09, 2017

]]>Polarization quasiprobability distribution defined in the Stokes space shares many important properties with the Wigner function for position and momentum. Most notably, they both give correct one-dimensional marginal probability distributions and therefore represent the natural choice for the proba...

[Phys. Rev. A 96, 023822] Published Wed Aug 09, 2017

]]>The quantum statistics of particles is determined by both the spins and the indistinguishability of quantum states. Here we study the quantum statistics of partially distinguishable photons by defining the multiphoton indistinguishability. The photon-bunching coefficient is formulated based on the p...

[Phys. Rev. A 96, 023823] Published Wed Aug 09, 2017

]]>We formulate the necessary and sufficient conditions for the existence of a pair of maximally incompatible two-outcome measurements in a finite-dimensional general probabilistic theory. The conditions are on the geometry of the state space; they require the existence of two pairs of parallel exposed...

[Phys. Rev. A 96, 022113] Published Tue Aug 08, 2017

]]>Optical clock interrogation protocols, based on laser-pulse spectroscopy, suffer from probe-induced frequency shifts and their variations induced by laser power. The original hyper-Ramsey probing scheme, which was proposed to alleviate those issues, does not fully eliminate the shift, especially whe...

[Phys. Rev. A 96, 023408] Published Tue Aug 08, 2017

]]>The negative-ion fragmentation of formic acid (HCOOH) is studied with negative- and positive-ion coincidence spectroscopy. We report four-body ionic fragmentation where up to three positive ions are collected in coincidence with one negative ion. We report yields for 21 three-body channels and five ...

[Phys. Rev. A 96, 023409] Published Tue Aug 08, 2017

]]>Quantum cascaded systems offer the possibility to manipulate a target system with the quantum state of a source system. Here, we study in detail the differences between a direct quantum cascade and coherent or incoherent driving for the case of two coupled cavity-QED systems. We discuss qualitative ...

[Phys. Rev. A 96, 023816] Published Tue Aug 08, 2017

]]>We revisit the mechanisms underlying the process of spectral broadening of incoherent optical waves propagating in nonlinear media on the basis of nonequilibrium thermodynamic considerations. A simple analysis reveals that a prerequisite for the existence of a significant spectral broadening of the ...

[Phys. Rev. A 96, 023817] Published Tue Aug 08, 2017

]]>Projective measurement is used as a fundamental axiom in quantum mechanics, even though it is discontinuous and cannot predict which measured operator eigenstate will be observed in which experimental run. The probabilistic Born rule gives it an ensemble interpretation, predicting proportions of var...

[Phys. Rev. A 96, 022108] Published Mon Aug 07, 2017

]]>We consider the dynamics of a collisional model in which both the system and environment are embodied by spin-$1/2$ particles. In order to include non-Markovian features in our model, we introduce interactions among the environmental qubits and investigate the effect that different models of such inte...

[Phys. Rev. A 96, 022109] Published Mon Aug 07, 2017

]]>We address the problem of characterizing the steerability of quantum states under restrictive measurement scenarios, i.e., the problem of determining whether a quantum state can demonstrate steering when subjected to $N$ measurements of $k$ outcomes. We consider the cases of either general positive oper...

[Phys. Rev. A 96, 022110] Published Mon Aug 07, 2017

]]>The Born rule provides a probability vector (distribution) with a quantum state for a measurement setting. For two settings, we have a pair of vectors from the same quantum state. Each pair forms a combined-probability vector that obeys certain quantum constraints, which are triangle inequalities in...

[Phys. Rev. A 96, 022111] Published Mon Aug 07, 2017

]]>We consider a two-state system consisting of a pair of coupled ferromagnetic waveguides. A monotonically increasing bias magnetic field can dynamically manipulate the system to enter a $\mathcal{PT}$ -symmetry-broken phase and then reenter a symmetric phase. The symmetry recovery is enabled by the presence of a...

[Phys. Rev. A 96, 022112] Published Mon Aug 07, 2017

]]>We address the question of whether symmetry-protected topological (SPT) order can persist at nonzero temperature, with a focus on understanding the thermal stability of several models studied in the theory of quantum computation. We present three results in this direction. First, we prove that nontr...

[Phys. Rev. A 96, 022306] Published Mon Aug 07, 2017

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