We consider finite-sized atomic systems with varying number of particles which have dipolar interactions among them and are also under the collective driving and dissipative effect of a thermal photon environment. Focusing on the simple case of two atoms, we investigate the impact of different param...

[Phys. Rev. A 96, 032117] Published Fri Sep 22, 2017

]]>We consider a quantum system continuously monitored in time which in turn is coupled to an arbitrary dissipative classical system (diagonal reduced density matrix). The quantum and classical dynamics can modify each other, being described by an arbitrary time-irreversible hybrid Lindblad equation. G...

[Phys. Rev. A 96, 032118] Published Fri Sep 22, 2017

]]>An experiment in which the Clauser-Horne-Shimony-Holt inequality is maximally violated is self-testing (i.e., it certifies in a device-independent way both the state and the measurements). We prove that an experiment maximally violating Gisin's elegant Bell inequality is not similarly self-testing. ...

[Phys. Rev. A 96, 032119] Published Fri Sep 22, 2017

]]>The quantum internet holds promise for accomplishing quantum teleportation and unconditionally secure communication freely between arbitrary clients all over the globe, as well as the simulation of quantum many-body systems. For such a quantum internet protocol, a general fundamental upper bound on ...

[Phys. Rev. A 96, 032332] Published Fri Sep 22, 2017

]]>We study entanglement generated between a charge qubit and a bosonic bath due to their joint evolution which leads to pure dephasing of the qubit. We tune the parameters of the interaction, so that the decoherence is quantitatively independent of the number of bosonic modes taken into account and in...

[Phys. Rev. A 96, 032333] Published Fri Sep 22, 2017

]]>Dynamics of a system in general depends on its initial state and how the system is driven, but in many-body systems the memory is usually averaged out during evolution. Here, interacting quantum systems without external relaxations are shown to retain long-time memory effects in steady states. To id...

[Phys. Rev. A 96, 033628] Published Fri Sep 22, 2017

]]>We propose a quantum simulation of the quantum Rabi model in an atomic quantum dot, which is a single atom in a tight optical trap coupled to the quasiparticle modes of a superfluid Bose-Einstein condensate. This widely tunable setup allows us to simulate the ultrastrong coupling regime of light-mat...

[Phys. Rev. A 96, 033839] Published Fri Sep 22, 2017

]]>We experimentally investigate various quantum polarization features of three-photon quantum states, including product and entangled states with varying purity. The three-photon quantum states are categorized into six classes based on the rotation symmetry of mean, variance, and skewness of the polar...

[Phys. Rev. A 96, 033840] Published Fri Sep 22, 2017

]]>By considering spin-$\frac{1}{2}$ degenerate Fermi gases in a ring cavity where strong interaction between atoms and light gives rise to superradiance, we find that the cavity dissipation can cause a severe broadening in some special cases, breaking down the quasiparticle picture which has been constantly assu...

[Phys. Rev. A 96, 033841] Published Fri Sep 22, 2017

]]>The Efimov effect was first predicted for three particles interacting at an $s$-wave resonance in three dimensions. A subsequent study showed that the same effect can be realized by considering two-body and three-body interactions in mixed dimensions. In this work, we consider the three-body problem o...

[Phys. Rev. A 96, 030702(R)] Published Thu Sep 21, 2017

]]>The van der Waals coefficient ${C}_{6}(\theta ;nlJM)$ of two like Rydberg atoms in their identical Rydberg states $|nlJM\rangle $ is resolved into four irreducible components called scalar ${R}_{ss}$, axial (vector) ${R}_{aa}$, scalar-tensor ${R}_{sT}={R}_{Ts}$, and tensor-tensor ${R}_{TT}$ parts in analogy with the components of dipole polarizabilities...

[Phys. Rev. A 96, 032716] Published Thu Sep 21, 2017

]]>We develop a theoretical framework for the analysis of ultrafast dynamics of photoionization in solids that treats the electron density buildup resolved within the field cycle jointly with the propagation dynamics of the laser driver. We show that while the standard, cycle-averaging photoionization ...

[Phys. Rev. A 96, 033415] Published Thu Sep 21, 2017

]]>We consider the Fermi polaron problem at zero temperature, where a single impurity interacts with noninteracting host fermions. We approach the problem starting with a Fröhlich-like Hamiltonian where the impurity is described with canonical position and momentum operators. We apply the Lee-Low-Pine ...

[Phys. Rev. A 96, 033627] Published Thu Sep 21, 2017

]]>We propose measurement-based conditional generation of the superposition of mesoscopic states of a nanomechanical resonator. We consider a two-level quantum mechanical system (qubit) coupled with a nanomechanical resonator through phonon exchange. An interaction, which produces shifts in the state o...

[Phys. Rev. A 96, 033837] Published Thu Sep 21, 2017

]]>Light propagation in a nonlinear optical medium is nonreciprocal for spatially asymmetric linear permittivity. We examine the physical mechanism and properties of such nonreciprocity (NR). For this, we calculate the transmission of light through two models of a nonlinear optical isolator consisting ...

[Phys. Rev. A 96, 033838] Published Thu Sep 21, 2017

]]>We revisit the confinement-induced $p$-wave resonance in quasi-one-dimensional (quasi-1D) atomic gases and study the induced molecules near resonance. We derive the reduced 1D interaction parameters and show that they can well predict the binding energy of shallow molecules in quasi-1D system. Importa...

[Phys. Rev. A 96, 030701(R)] Published Wed Sep 20, 2017

]]>We address the dynamics of a bosonic system coupled to either a bosonic or a magnetic environment and derive a set of sufficient conditions that allow one to describe the dynamics in terms of the effective interaction with a classical fluctuating field. We find that for short interaction times the d...

[Phys. Rev. A 96, 032116] Published Wed Sep 20, 2017

]]>We give a path-integral formulation of the time evolution of qudits of odd dimension. This allows us to consider semiclassical evolution of discrete systems in terms of an expansion of the propagator in powers of $\hslash $. The largest power of $\hslash $ required to describe the evolution is a traditional measure o...

[Phys. Rev. A 96, 032331] Published Wed Sep 20, 2017

]]>We investigate the interatomic Coulombic decay (ICD) in argon dimers induced by electron-impact ionization (${E}_{0}=90\phantom{\rule{0.16em}{0ex}}\mathrm{eV}$) using a multiparticle coincidence experiment in which the momentum vectors and, consequently, the kinetic energies for electrons and fragment ions are determined. The signature of the...

[Phys. Rev. A 96, 032715] Published Wed Sep 20, 2017

]]>Precisely evaluating the systematic error induced by the quadratic Zeeman effect is important for developing atom interferometer gravimeters aiming at an accuracy in the $\mu \mathrm{Gal}$ regime ($1\mu \mathrm{Gal}={10}^{-8}\mathrm{m}/{\mathrm{s}}^{2}\approx {10}^{-9}\mathrm{g}$). This paper reports on the experimental investigation of Raman spectroscopy-based magnetic fiel...

[Phys. Rev. A 96, 033414] Published Wed Sep 20, 2017

]]>The one-body density matrix (OBDM) is a fundamental contraction of the Bose-Einstein condensate wave function, encapsulating its one-body properties. It serves as a major analysis tool with which the condensed component of the density can be identified. Despite its cardinal importance, calculating t...

[Phys. Rev. A 96, 033626] Published Wed Sep 20, 2017

]]>We study light propagation through a slab of cold gas using both the standard electrodynamics of polarizable media and massive atom-by-atom simulations of the electrodynamics. The main finding is that the predictions from the two methods may differ qualitatively when the density of the atomic sample...

[Phys. Rev. A 96, 033835] Published Wed Sep 20, 2017

]]>We show that optical turbulence extreme events can exist in the transverse dynamics of a cavity containing molecules of triple quantum dots under conditions close to tunneling-induced transparency. These nanostructures, when coupled via tunneling, form a four-level configuration with tunable energy-...

[Phys. Rev. A 96, 033836] Published Wed Sep 20, 2017

]]>It is argued that a weak value of an observable is a robust property of a single pre- and postselected quantum system rather than a statistical property. During an infinitesimal time a system with a given weak value affected other systems as if it had been in an eigenstate with eigenvalue equal to t...

[Phys. Rev. A 96, 032114] Published Tue Sep 19, 2017

]]>Exploiting the master equations in the Lindblad form, we establish a sufficient and necessary condition for a Markovian dynamics to be unital. Based on this condition, we analyze the dynamical property of quantum Rényi entropy and propose a characterization of quantum non-Markovianity for unital dyn...

[Phys. Rev. A 96, 032115] Published Tue Sep 19, 2017

]]>We introduce and analyze *graph-associated entanglement cost*, a generalization of the entanglement cost of quantum states to multipartite settings. We identify a necessary and sufficient condition for any multipartite entangled state to be constructible when quantum communication between the multiple...

[Phys. Rev. A 96, 032330] Published Tue Sep 19, 2017

]]>The softness of collisions, or the average number of collisions each atom undergoes until its energy decorrelates significantly, is measured spectroscopically for ultracold atoms. The knowledge obtained is important for improving various technologies involving ultracold atoms, such as atomic clocks, quantum metrology, and the realization of quantum information systems.

[Phys. Rev. A 96, 032713] Published Tue Sep 19, 2017

]]>We present calculations of electron-capture cross sections in collisions of ${\mathrm{H}}^{+}$ with BeH molecules in the energy range $25\phantom{\rule{0.28em}{0ex}}\mathrm{eV}<E<10\phantom{\rule{0.28em}{0ex}}\mathrm{keV}$. We discuss the validity of the models employed to describe nonadiabatic ion-molecule collisions, specifically the eikonal approximation, the Franck-Condon approxi...

[Phys. Rev. A 96, 032714] Published Tue Sep 19, 2017

]]>We theoretically investigate the electron-tunneling process for a helium atom irradiated by an elliptical strong laser field. The momentum distribution for an electron ionized during the cycle when the laser intensity reaches its maximum is captured, such that we can ignore the interference between ...

[Phys. Rev. A 96, 033413] Published Tue Sep 19, 2017

]]>We derive a connection between the fourth coefficient of the short-distance Taylor expansion of the one-body correlation function, and the local three-body correlation function of the Lieb-Liniger model of $\delta $-interacting spinless bosons in one dimension. This connection, valid at arbitrary interactio...

[Phys. Rev. A 96, 033624] Published Tue Sep 19, 2017

]]>A new generation of cold atom experiments trapping atomic mixtures in species-selective optical potentials opens up the intriguing possibility to create systems in which different atoms live in different spatial dimensions. Inspired by this, we investigate a mixed-dimensional Bose polaron consisting...

[Phys. Rev. A 96, 033625] Published Tue Sep 19, 2017

]]>Here the Abraham-Minkowski controversy on the correct definition of the light momentum in a macroscopic medium is revisited with the purpose to highlight that an effective medium formalism necessarily restricts the available information on the internal state of a system, and that this is ultimately ...

[Phys. Rev. A 96, 033831] Published Tue Sep 19, 2017

]]>The optomechanics can generate fantastic effects of optics due to appropriate mechanical control. Here we theoretically study effects of slow and fast lights in a single-sided optomechanical cavity with an external force. The force-induced transparency of slow and fast lights and the force-dependent...

[Phys. Rev. A 96, 033832] Published Tue Sep 19, 2017

]]>We investigate the use of twin-mode quantum states of light with symmetric statistical features in their photon number for improving intensity-sensitive surface plasmon resonance (SPR) sensors. For this purpose, one of the modes is sent into a prism setup where the Kretschmann configuration is emplo...

[Phys. Rev. A 96, 033833] Published Tue Sep 19, 2017

]]>Suppose we measure the time-dependent spectrum of a single photon. That is, we first send the photon through a set of frequency filters (which we assume to have different filter frequencies but the same finite bandwidth $\mathrm{\Gamma}$) and then record at what time (with some finite precision $\mathrm{\Delta}t$ and some finite e...

[Phys. Rev. A 96, 033834] Published Tue Sep 19, 2017

]]>We discuss the ground-state properties of a one-dimensional bosonic system doped with an impurity (the so-called Bose polaron problem). We introduce a formalism that allows us to calculate analytically the thermodynamic zero-temperature properties of this system with weak and moderate boson-boson in...

[Phys. Rev. A 96, 031601(R)] Published Mon Sep 18, 2017

]]>The purpose of physics is to describe nature from elementary particles all the way up to cosmological objects like cluster of galaxies and black holes. Although a unified description for all this spectrum of events is desirable, this would be highly impractical. To not get lost in unnecessary detail...

[Phys. Rev. A 96, 032113] Published Mon Sep 18, 2017

]]>We study theoretically the teleportation of a controlled-phase (cz) gate through measurement-based quantum-information processing for continuous-variable systems. We examine the degree of entanglement in the output modes of the teleported cz-gate for two classes of resource states: the canonical clu...

[Phys. Rev. A 96, 032327] Published Mon Sep 18, 2017

]]>We investigate the tunable quantum entanglement and the probabilities of excitations in a system of three qubits in a nonstationary cavity due to the dynamical Lamb effect, caused by nonadiabatic fast change of the boundary conditions of the cavity. The transition amplitudes and the probabilities of...

[Phys. Rev. A 96, 032328] Published Mon Sep 18, 2017

]]>We propose a method for implementing automated state transformations on single-photon multipath qudits encoded in a one-dimensional transverse spatial domain. It relies on transferring the encoding from this domain to the orthogonal one by applying a spatial phase modulation with diffraction grating...

[Phys. Rev. A 96, 032329] Published Mon Sep 18, 2017

]]>Single-electron capture from one-electron and multielectron atoms colliding with hydrogenlike projectiles at intermediate and high incident energies is examined by using the post version of the boundary-corrected four-body continuum-intermediate-state (BCIS-4B) method. This method satisfies the corr...

[Phys. Rev. A 96, 032709] Published Mon Sep 18, 2017

]]>A theoretical study of double-differential cross sections (DDCSs) for single ionization of ${\text{CH}}_{{}_{4}}$ and ${\text{NH}}_{{}_{3}}$ molecules by collision with proton is presented at 0.25, 1, and 2 MeV, respectively. For the final state, we use a continuum distorted wave that contains the product of three-Coulomb distortion due...

[Phys. Rev. A 96, 032710] Published Mon Sep 18, 2017

]]>We present experimental results on the inelastic and elastic interspecies interactions between ytterbium (Yb) in the metastable ${}^{3}P{}_{2}$ state loaded into a deep optical lattice and spin polarized lithium (Li) in its ground state. Focusing on the ${m}_{J}=0$ magnetic sublevel of $\mathrm{Yb}({}^{3}P{}_{2}$), bias magnetic fields be...

[Phys. Rev. A 96, 032711] Published Mon Sep 18, 2017

]]>A quasiclassical model based on the resolution of Hamilton equations of motion is used to get evidence for Auger electron emission following double-electron capture in 150-keV $\mathrm{N}{\mathrm{e}}^{10+}+\mathrm{He}$ collisions. Electron-electron interaction is taken into account during the collision by using pure Coulombic potent...

[Phys. Rev. A 96, 032712] Published Mon Sep 18, 2017

]]>The photoionization of a helium atom by short intense laser pulses is studied theoretically in the vicinity of the $2s2p{\phantom{\rule{0.28em}{0ex}}}^{1}P$ doubly excited state with the intention to investigate the impact of the intensity and duration of the exciting pulse on the dynamics of the autoionization process. For that purp...

[Phys. Rev. A 96, 033410] Published Mon Sep 18, 2017

]]>The interplay between classical and quantum-mechanical evolution in the optical centrifuge (OC) is discussed. The analysis is based on the quantum-mechanical formalism starting from either the ground state or a thermal ensemble. Two resonant mechanisms are identified, i.e., the classical autoresonan...

[Phys. Rev. A 96, 033411] Published Mon Sep 18, 2017

]]>The light-shift theory of many-electron systems in a laser field is described using the projection operators technique. In heavy ions, the electrons are tightly bound by the Coulomb potential of the nucleus, which prohibits ionization even by strong lasers. However, interaction with the monofrequent...

[Phys. Rev. A 96, 033412] Published Mon Sep 18, 2017

]]>We introduce two- and one-dimensional (2D and 1D) systems of two linearly coupled Gross-Pitaevskii equations (GPEs) with the cubic self-attraction and harmonic-oscillator (HO) trapping potential in each GPE. The system models a Bose-Einstein condensate with a negative scattering length, loaded in a ...

[Phys. Rev. A 96, 033621] Published Mon Sep 18, 2017

]]>Motivated by a recent experiment, which synthesizes Landau levels for photons on cones [Schine *et al.*, Nature (London) **534**, 671 (2016)], and more generally the interest in understanding gravitational responses of quantum Hall states, we study fractional quantum Hall states of bosons on cones. A var...

[Phys. Rev. A 96, 033622] Published Mon Sep 18, 2017

]]>We study computationally the collision dynamics of vortices in a two-dimensional spin-2 Bose-Einstein condensate. In contrast to Abelian vortex pairs, which annihilate or pass through each other, we observe non-Abelian vortex pairs to undergo *rungihilation*—an event that converts the colliding vortic...

[Phys. Rev. A 96, 033623] Published Mon Sep 18, 2017

]]>We introduce a frequency-dependent incoherent pump scheme with a square-shaped spectrum as a way to study strongly correlated photons in arrays of coupled nonlinear resonators. This scheme can be implemented via a reservoir of population-inverted two-level emitters with a broad distribution of trans...

[Phys. Rev. A 96, 033828] Published Mon Sep 18, 2017

]]>Dicke's original thought experiment with two spins (two-level atoms) coupled to a photon mode has recently been experimentally realized. We propose extending this experiment to many spins as a way to synthesize highly entangled states. We suggest a protocol in which we start with a direct product st...

[Phys. Rev. A 96, 033829] Published Mon Sep 18, 2017

]]>The quality of individual photons and their ability to interfere are traditionally tested by measuring the Hong-Ou-Mandel photon bunching effect. However, this phase-insensitive measurement only tests the particle aspect of the quantum interference, leaving out the phase-sensitive aspects relevant f...

[Phys. Rev. A 96, 033830] Published Mon Sep 18, 2017

]]>Weak-value amplification (WVA) has recently become an important technique for parameter estimation, owing to its ability to enhance the signal-to-noise ratio by amplifying extremely small signals with proper postselection strategies. In this paper, we propose an adaptive WVA scheme to achieve the hi...

[Phys. Rev. A 96, 032112] Published Fri Sep 15, 2017

]]>We propose a realization of a synthetic random flux model in a two-dimensional optical lattice. Starting from Bose-Hubbard Hamiltonian for two atom species, we show how to use fast-periodic modulation of the system parameters to construct a random gauge field. We investigate the transport properties...

[Phys. Rev. A 96, 033620] Published Fri Sep 15, 2017

]]>Studying $K$-shell hollow atom spectra broadens our knowledge on femtosecond phenomena in atomic physics, chemistry, and biology. Recent synchrotron measurements of the two-electron one-photon (TEOP) transitions of low-$Z$ atoms have shown discrepancies between experiment and theoretical predictions of ...

[Phys. Rev. A 96, 031402(R)] Published Thu Sep 14, 2017

]]>The divisibility of dynamical maps is visualized by trajectories in the parameter space and analyzed within the framework of collision models. We introduce ultimate completely positive (CP) divisible processes, which lose CP divisibility under infinitesimal perturbations, and characterize Pauli dyna...

[Phys. Rev. A 96, 032111] Published Thu Sep 14, 2017

]]>We study the complexity of classically sampling from the output distribution of an Ising spin model, which can be implemented naturally in a variety of atomic, molecular, and optical systems. In particular, we construct a specific example of an Ising Hamiltonian that, after time evolution starting f...

[Phys. Rev. A 96, 032324] Published Thu Sep 14, 2017

]]>It was suggested that two entangled fermions can behave like a single boson and that the bosonic quality is proportional to the degree of entanglement between the two particles. The relation between bosonic quality and entanglement is quite natural if one takes into account the fact that entanglemen...

[Phys. Rev. A 96, 032325] Published Thu Sep 14, 2017

]]>We develop an alternative boson sampling model operating on single-photon states followed by linear interferometry and Gaussian measurements. The hardness proof for simulating such continuous-variable measurements is established in two main steps, making use of the symmetry of quantum evolution unde...

[Phys. Rev. A 96, 032326] Published Thu Sep 14, 2017

]]>Trapped-ion quantum platforms are subject to “anomalous” heating due to interactions with electric-field noise sources of nature not yet completely known. There is ample experimental evidence that this noise originates at the surfaces of the trap electrodes, and models assuming fluctuating pointlike...

[Phys. Rev. A 96, 033409] Published Thu Sep 14, 2017

]]>We show that the interplay between spin-orbit coupling and Zeeman splitting in atomic systems can lead to the existence of bound states in the continuum (BICs) supported by trapping potentials. Such states have energies falling well within the continuum spectrum, but nevertheless they are localized ...

[Phys. Rev. A 96, 033619] Published Thu Sep 14, 2017

]]>In his recent article [Phys. Rev. A **95**, 060101(R) (2017)], Adler questions the usefulness of the bound found in our experimental search for genuine effects of hypercomplex quantum mechanics [Nat. Commun. **8**, 15044 (2017)]. Our experiment was performed using a black-box (instrumentalist) approach to g...

[Phys. Rev. A 96, 036101] Published Thu Sep 14, 2017

]]>We discuss the possibility of using optical dipole forces for Sisyphus cooling of ions stored in a Penning trap by addressing the specific case of the molecular cooling candidate ${{\mathrm{C}}_{2}}^{-}$. Using a GPU accelerated code for Penning trap simulations, which we extended to include the molecule-light interacti...

[Phys. Rev. A 96, 031401(R)] Published Wed Sep 13, 2017

]]>Concentric cavities can lead to strong photon-atom coupling without a need for high finesse or small physical-cavity volume. In this proof-of-principle experiment we demonstrate coupling of single Rb atoms to an 11-mm-long near-concentric cavity with a finesse $F=138\left(2\right)$. Operating the cavity $1.7\left(1\right)\phantom{\rule{0.28em}{0ex}}\mu \mathrm{m}$...

[Phys. Rev. A 96, 031802(R)] Published Wed Sep 13, 2017

]]>A solution to the second measurement problem, determining what prior microscopic properties can be inferred from measurement outcomes (“pointer positions”), is worked out for projective and generalized (POVM) measurements, using consistent histories. The result supports the idea that equipment prope...

[Phys. Rev. A 96, 032110] Published Wed Sep 13, 2017

]]>We show that it is possible to use a quantum walk to find a path from one marked vertex to another. In the specific case of $M$ stars connected in a chain, one can find the path from the first star to the last one in $O\left(M\sqrt{N}\right)$ steps, where $N$ is the number of spokes of each star. First we provide an analyt...

[Phys. Rev. A 96, 032323] Published Wed Sep 13, 2017

]]>The fragmentation dynamics of an endohedral fullerene, $\mathrm{S}{\mathrm{c}}_{3}\mathrm{N}@{\mathrm{C}}_{80}$, after absorption of a soft-x-ray photon, has been studied with an ion-ion-coincidence momentum-imaging technique. Molecular inner-shell ionization at 406.5 eV, targeting the Sc ($2p$) shell of the encapsulated $\mathrm{S}{\mathrm{c}}_{3}\mathrm{N}$ moiety and the C ($1s$) ...

[Phys. Rev. A 96, 033408] Published Wed Sep 13, 2017

]]>This paper introduces a model for a few repulsively interacting particles trapped in a one-dimensional harmonic well and provides exact solutions for the three-particle case. This model is a hybrid of two other well-known systems, the Calogero model and the contact-interaction model, and coincides w...

[Phys. Rev. A 96, 033616] Published Wed Sep 13, 2017

]]>We present a time-dependent density-matrix renormalization group investigation of the quantum distillation process within the Fermi-Hubbard model on a quasi-one-dimensional ladder geometry. The term distillation refers to the dynamical, spatial separation of singlons and doublons in the sudden expan...

[Phys. Rev. A 96, 033617] Published Wed Sep 13, 2017

]]>We present a numerical study of the dynamic response of a confined superfluid Fermi gas to a rapid change of the scattering length (i.e., an interaction quench). Based on a fully microscopic time-dependent density-matrix approach within the full Bogoliubov–de Gennes formalism that includes a 3D harm...

[Phys. Rev. A 96, 033618] Published Wed Sep 13, 2017

]]>Coherent intense attosecond x-ray pulses could lead to a fast dynamical imaging of biological macromolecules and other material nanostructures with a unique combination of a record high temporal and spatial resolution. Plasma-based x-ray laser sources are capable of producing high-energy x-ray pulse...

[Phys. Rev. A 96, 033825] Published Wed Sep 13, 2017

]]>We investigate the occurrence of a phase transition, characterized by the spontaneous breaking of a discrete symmetry, in a driven-dissipative Bose-Hubbard lattice in the presence of two-photon coherent driving. The driving term does not lift the original $\text{U}\left(1\right)$ symmetry completely and a discrete ${\mathbb{Z}}_{2}$ s...

[Phys. Rev. A 96, 033826] Published Wed Sep 13, 2017

]]>Bloch oscillations of spatiotemporal light wave packets in arrays of nonlinear fibers with high-order dispersion are studied. The light wave experiences discrete spatial diffraction along the waveguide array coordinate together with continuous temporal dispersion including higher-order terms. When a...

[Phys. Rev. A 96, 033827] Published Wed Sep 13, 2017

]]>We show that a transition-metal dichalcogenide monolayer with a radiatively broadened exciton resonance would exhibit perfect extinction of the transmitted field. This result holds for $s$- or $p$-polarized weak resonant light fields at any incidence angle, due to the conservation of the in-plane moment...

[Phys. Rev. A 96, 031801(R)] Published Tue Sep 12, 2017

]]>We investigate the maximum rates for transmitting quantum information, distilling entanglement, and distributing secret keys between a sender and a receiver in a multipoint communication scenario, with the assistance of unlimited two-way classical communication involving all parties. First we consid...

[Phys. Rev. A 96, 032318] Published Tue Sep 12, 2017

]]>We analyze the problem of quantum phase estimation in which the set of allowed phases forms a discrete $N$-element subset of the whole $[0,2\pi ]$ interval, ${\phi}_{n}=2\pi n/N,n=0,\cdots ,N-1$, and study the discrete-to-continuous transition $N\to \infty $ for various cost functions as well as the mutual information. We also analyze...

[Phys. Rev. A 96, 032319] Published Tue Sep 12, 2017

]]>We consider the situation when the signal propagating through each arm of an interferometer has a complicated multimode structure. We demonstrate that the shot-noise level for such a setup is the same as for the common two-mode case for as long as the interferometric transformation treats each arm a...

[Phys. Rev. A 96, 032320] Published Tue Sep 12, 2017

]]>A central result in the study of quantum Hamiltonian complexity is that the $k$-local Hamiltonian problem is quantum-Merlin-Arthur–complete. In that problem, we must decide if the lowest eigenvalue of a Hamiltonian is bounded below some value, or above another, promised one of these is true. Given the...

[Phys. Rev. A 96, 032321] Published Tue Sep 12, 2017

]]>We investigate genuinely entangled $N$-qubit states with no $N$-partite correlations in the case of symmetric states. Using a tensor representation for mixed symmetric states, we obtain a simple characterization of the absence of $N$-partite correlations. We show that symmetric states with no $N$-partite co...

[Phys. Rev. A 96, 032322] Published Tue Sep 12, 2017

]]>A combined adiabatic approach is proposed in which orbital expectations of the Kohn-Sham operator (KSEs) are embedded into the matrix environment of time-dependent phase-including natural-orbital functional theory (TDPINOFT). Analytical diagonalization of a model molecular matrix eigenvalue problem ...

[Phys. Rev. A 96, 032507] Published Tue Sep 12, 2017

]]>As an extension to powerful two-dimensional coherent spectroscopy, optical three-dimensional (3D) coherent spectroscopy has been experimentally implemented and found beneficial in studying various systems in physics and chemistry. A critical challenge is how to interpret 3D spectra and extract usefu...

[Phys. Rev. A 96, 032508] Published Tue Sep 12, 2017

]]>The antidynamical Casimir effect (ADCE) is a term coined to designate the coherent annihilation of excitations due to resonant external perturbation of system parameters, allowing for extraction of quantum work from nonvacuum states of some field. Originally proposed for a two-level atom (qubit) cou...

[Phys. Rev. A 96, 032509] Published Tue Sep 12, 2017

]]>Theoretical total cross-section results for all ionization and capture processes in the ${\mathrm{He}}^{+}$-He collision system are presented in the approximate impact energy range of 10–1000 keV/amu. Calculations were performed within the framework of time-dependent spin-density functional theory. The Krieger-Li-I...

[Phys. Rev. A 96, 032708] Published Tue Sep 12, 2017

]]>We present a numerical method to calculate the macroscopic harmonic spectrum generated from the gas-exposed nanostructure. This method includes the propagation of plasmonic and harmonic fields in the macroscopic medium as well as the response of the single atom exposed to plasmonic field. Based on t...

[Phys. Rev. A 96, 033407] Published Tue Sep 12, 2017

]]>We report on direct measurements of the emission character of quantum cascade laser based frequency combs, using intensity autocorrelation. Our implementation is based on fast electro-optic sampling, with a detection spectral bandwidth matching the emission bandwidth of the comb laser, around 2.5 TH...

[Phys. Rev. A 96, 033821] Published Tue Sep 12, 2017

]]>The computation of light scattering by the superposition $T$-matrix scheme has been restricted thus far to systems made of particles that are either sparsely distributed or of near-spherical shape. In this work, we extend the range of applicability of the $T$-matrix method by accounting for the coupling...

[Phys. Rev. A 96, 033822] Published Tue Sep 12, 2017

]]>A precise, accurate, and relatively straightforward *in situ* method to measure and control the ellipticity of light resonantly interacting with an atomic vapor is described. The technique can be used to minimize vector light shifts. The method involves measurement of ellipticity-induced resonances in...

[Phys. Rev. A 96, 033823] Published Tue Sep 12, 2017

]]>We study guided modes in non-Hermitian optical waveguides with dielectric layers having either gain or loss. For the case of a three-layer waveguide, we describe stationary regimes for guided modes when gain and loss compensate each other in the entire structure rather than in each layer. We demonst...

[Phys. Rev. A 96, 033824] Published Tue Sep 12, 2017

]]>Both conservation laws and practical restrictions impose symmetry constraints on the dynamics of open quantum systems. In the case of time-translation symmetry, which arises naturally in many physically relevant scenarios, the quantum coherence between energy eigenstates becomes a valuable resource ...

[Phys. Rev. A 96, 032109] Published Mon Sep 11, 2017

]]>We map the quantum entanglement problem onto the mathematically well-studied truncated moment problem. This yields a necessary and sufficient condition for separability that can be checked by a hierarchy of semidefinite programs. The algorithm always gives a certificate of entanglement if the state ...

[Phys. Rev. A 96, 032312] Published Mon Sep 11, 2017

]]>Measurement outcomes of a quantum state can be genuinely random (unpredictable) according to the basic laws of quantum mechanics. The Heisenberg-Robertson uncertainty relation puts constraints on the accuracy of two noncommuting observables. The existing uncertainty relations adopt variance or entro...

[Phys. Rev. A 96, 032313] Published Mon Sep 11, 2017

]]>We show that arbitrary $N$-qubit interactions among nuclear spins can be achieved efficiently in solid state quantum platforms, such as nitrogen vacancy centers in diamond, by exerting control only on the electron spin coupled to the nuclei. This allows to exploit nuclear spins as robust quantum regis...

[Phys. Rev. A 96, 032314] Published Mon Sep 11, 2017

]]>We study the creation and distribution of entanglement in disordered $XY$-type spin-$1/2$ chains for the paradigmatic case of a single flipped spin prepared on a fully polarized background. The local magnetic field is set to follow a disordered long-range-correlated sequence with power-law spectrum. Dep...

[Phys. Rev. A 96, 032315] Published Mon Sep 11, 2017

]]>We establish a general operational one-to-one mapping between coherence measures and entanglement measures: Any entanglement measure of bipartite pure states is the minimum of a suitable coherence measure over product bases. Any coherence measure of pure states, with extension to mixed states by con...

[Phys. Rev. A 96, 032316] Published Mon Sep 11, 2017

]]>Recent progress in the characterization of gapped quantum phases has also triggered the search for a universal resource for quantum computation in symmetric gapped phases. Prior works in one dimension suggest that it is a feature more common than previously thought, in that nontrivial one-dimensiona...

[Phys. Rev. A 96, 032317] Published Mon Sep 11, 2017

]]>We study the thermal Casimir-Polder (CP) forces on a V-type three-level atom. The competition between the thermal effect and the quantum interference of the two transition dipoles on the force is investigated. To shed light onto the role of the quantum interference, we analyze two kinds of initial s...

[Phys. Rev. A 96, 032506] Published Mon Sep 11, 2017

]]>Low-energy electron elastic scattering and impact ionization with hydrogenlike helium in Debye plasmas have been investigated by employing the exterior complex scaling method. The interactions between charged particles in the plasmas have been represented by Debye-Hückel potentials. The $1s-1s$ elasti...

[Phys. Rev. A 96, 032707] Published Mon Sep 11, 2017

]]>We investigate the dynamics around an obstacle potential moving in the plane-wave state of a pseudospin-$1/2$ Bose-Einstein condensate with Rashba spin-orbit coupling. We numerically investigate the dynamics of the system and find that it depends not only on the velocity of the obstacle but also signi...

[Phys. Rev. A 96, 033613] Published Mon Sep 11, 2017

]]>We theoretically investigate magnetic properties of a trapped ultracold Fermi gas. Including pairing fluctuations within the framework of an extended $T$-matrix approximation, as well as effects of a harmonic trap in the local density approximation, we calculate the local spin susceptibility ${\chi}_{\mathrm{t}}(r,T)$ i...

[Phys. Rev. A 96, 033614] Published Mon Sep 11, 2017

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