Mutual information is the reciprocal information that is common to or shared by two or more parties. Quantum mutual information for bipartite quantum systems is non-negative, and bears the interpretation of total correlation between the two subsystems. This may, however, no longer be true for three ...

[Phys. Rev. A 96, 012332] Published Thu Jul 27, 2017

]]>The non-Abelian geometric phases appear only in a degenerate subspace and the most familiar model with such a subspace is the $N$-pod system. Here we propose an alternative system to realize a non-Abelian gauge structure. We demonstrate that a three-level system with a triangular form can have two deg...

[Phys. Rev. A 96, 012333] Published Thu Jul 27, 2017

]]>Due to the exponential complexity of the resources required by quantum state tomography (QST), people are interested in approaches towards identifying quantum states which require less effort and time. In this paper, we provide a tailored and efficient method for reconstructing mixed quantum states ...

[Phys. Rev. A 96, 012334] Published Thu Jul 27, 2017

]]>We report a comparative study of low-lying valence electronic states of carbon dioxide by high-resolution inelastic x-ray and electron scattering. Momentum-transfer-dependent inelastic squared form factors for the two states ${}^{1}{\mathrm{\Sigma}}_{\mathrm{u}}^{+}$ and ${}^{1}{\mathrm{\Pi}}_{\mathrm{u}}$ and generalized oscillator strength for the 9 eV feature from ...

[Phys. Rev. A 96, 012518] Published Thu Jul 27, 2017

]]>We present a joint experimental and theoretical study of the VUV-induced dynamics of ${\mathrm{H}}_{2}\mathrm{O}$ and its deuterated isotopologues in the first excited state ($\stackrel{\u0303}{A}{\phantom{\rule{0.28em}{0ex}}}^{1}{B}_{1}$) utilizing a VUV-pump VUV-probe scheme combined with $ab$ *initio* classical trajectory calculations. 16-fs VUV pulses centered at 161 nm created by...

[Phys. Rev. A 96, 013428] Published Thu Jul 27, 2017

]]>We propose a method to generate path-entangled NOON-state photons from quantum dots and coupled nanocavities. In the systems we considered, cavity mode frequencies are tuned close to the biexciton two-photon resonance. Under appropriate conditions, the system can have the target NOON state in the en...

[Phys. Rev. A 96, 013853] Published Thu Jul 27, 2017

]]>A full quantum simulation of the photon-phonon interaction in an optomechanical system is developed. The implications for the quantum storage of coherent states are discussed, showing that even with current experimental parameters, unexpectedly strong nonlinear effects can dominate spectral features and reduce the quantum memory fidelity.

[Phys. Rev. A 96, 013854] Published Thu Jul 27, 2017

]]>Nanomechanical oscillators as well as Rydberg-atomic waveguides hosted on microfabricated chip surfaces hold promise to become pillars of future quantum technologies. In a hybrid platform with both, we show that beams of Rydberg atoms in waveguides can quantum coherently interrogate and manipulate n...

[Phys. Rev. A 96, 013855] Published Thu Jul 27, 2017

]]>Stimulated by suggestions of quantum effects in energy transport in photosynthesis, the fundamental principles responsible for the near-unit efficiency of the conversion of solar to chemical energy became active again in recent years. Under natural conditions, the formation of stable charge-separati...

[Phys. Rev. A 96, 012125] Published Wed Jul 26, 2017

]]>We study the loss of quantumness caused by time dilation [I. Pikovski, M. Zych, F. Costa, and Č. Brukner, Nat. Phys. **11**, 668 (2015)] for a Schrödinger cat state. We give a holistic view of the quantum to classical transition by comparing the dynamics of several nonclassicality indicators, such as th...

[Phys. Rev. A 96, 012126] Published Wed Jul 26, 2017

]]>We analyze the entanglement measure ${C}_{4}$ for specific mixed states in general and for the ground state of the transverse $XY$ spin-1/2 chain. We find that its factorizing property for pure states does not easily extend to mixed states. For cases where the density matrix is a tensor product, ${C}_{4}$ is defini...

[Phys. Rev. A 96, 012331] Published Wed Jul 26, 2017

]]>The giant thermal effect in the Casimir force is proposed to be measured between an Au-coated sphere and a graphene-coated Si substrate made of dielectric Si. It is found that the thermal effect is observable when the sphere and the substrate are separated by a distance from 0.1 to 1.5 $\mu $m.

[Phys. Rev. A 96, 012517] Published Wed Jul 26, 2017

]]>The dissociation of the molecular ion ${\mathrm{HD}}^{+}$ in moderate-intensity laser pulses is studied using the time-dependent quantum wave-packet method. Simulations of the time-of-flight (TOF) neutral atom spectra produced from dissociation of the $v=10$ vibrational state at a laser intensity of ${10}^{12}\phantom{\rule{0.16em}{0ex}}\mathrm{W}/{\mathrm{cm}}^{2}$ and fro...

[Phys. Rev. A 96, 013426] Published Wed Jul 26, 2017

]]>We report on the observation and numerical calculation of ionization spectra of highly Stark-shifted Rydberg states of rubidium beyond the classical ionization threshold. In the numerical calculations, a complex absorbing potential (CAP) allows us to predict the energy levels and ionization rates of...

[Phys. Rev. A 96, 013427] Published Wed Jul 26, 2017

]]>We study, by quantum Monte Carlo simulations, the ground state of a harmonically confined dipolar Bose gas with aligned dipole moments and with the inclusion of a repulsive two-body potential of varying range. Two different limits can clearly be identified, namely, a classical one in which the attra...

[Phys. Rev. A 96, 013627] Published Wed Jul 26, 2017

]]>Motivated by the recent experimental realization of the Haldane model by ultracold fermions in an optical lattice, we investigate phase diagrams of the hard-core Bose-Hubbard model on a honeycomb lattice. This model is closely related with a spin-1/2 antiferromagnetic (AF) quantum spin model. Neares...

[Phys. Rev. A 96, 013628] Published Wed Jul 26, 2017

]]>By using an analogy with axioniclike systems, we study light propagation in a periodic photonic topological insulator (PTI). The main result of this paper is an explicit expression for the PTI band structure. More specifically, it was found that for nonzero values of the topological phase difference...

[Phys. Rev. A 96, 013852] Published Wed Jul 26, 2017

]]>[Phys. Rev. A 96, 019903] Published Wed Jul 26, 2017

]]>We study the impact of Rydberg molecule formation on the storage and retrieval of Rydberg polaritons in an ultracold atomic medium. We observe coherent revivals appearing in the storage and retrieval efficiency of stored photons that originate from simultaneous excitation of Rydberg atoms and Rydber...

[Phys. Rev. A 96, 011402(R)] Published Tue Jul 25, 2017

]]>In the consistent histories approach to quantum theory probabilities are assigned to histories subject to a consistency condition of negligible interference. The approach has the feature that a given physical situation admits multiple sets of consistent histories that cannot in general be united int...

[Phys. Rev. A 96, 012123] Published Tue Jul 25, 2017

]]>One of the formulations of Heisenberg uncertainty principle, concerning so-called measurement uncertainty, states that the measurement of one observable modifies the statistics of the other. Here, we derive such a measurement uncertainty principle from two comprehensible assumptions: impossibility o...

[Phys. Rev. A 96, 012124] Published Tue Jul 25, 2017

]]>In various applications one is interested in quantum dynamics at intermediate evolution times, for which the adiabatic approximation is inadequate. Here we develop a quasiadiabatic approximation based on the WKB method, designed to work for such intermediate evolution times. We apply it to the probl...

[Phys. Rev. A 96, 012329] Published Tue Jul 25, 2017

]]>Cooling the qubit into a pure initial state is crucial for realizing fault-tolerant quantum information processing. Here we envisage a star-topology arrangement of reset and computation qubits for this purpose. The reset qubits cool or purify the computation qubit by transferring its entropy to a he...

[Phys. Rev. A 96, 012330] Published Tue Jul 25, 2017

]]>Nuclei with spin $I\ge 1$ have a weak quadrupole moment which leads to tensor contribution to the parity nonconserving interaction between nuclei and electrons. We calculate this contribution for atoms of current experiment interest ${\mathrm{Yb}}^{+}$, Fr, and ${\mathrm{Ra}}^{+}$. We have also performed order of magnitude estimates an...

[Phys. Rev. A 96, 012516] Published Tue Jul 25, 2017

]]>In this paper we propose a nonperturbative approximation to electronic stopping power based on the central screened potential of a projectile moving in a free-electron gas, by Nagy and Apagyi [Phys. Rev. A **58**, R1653 (1998)]. We used this model to evaluate the energy loss of protons and antiprotons i...

[Phys. Rev. A 96, 012707] Published Tue Jul 25, 2017

]]>In the leading-order approximation of the weak-field asymptotic theory (WFAT), the dependence of the tunneling ionization rate of a molecule in an electric field on its orientation with respect to the field is determined by the structure factor of the ionizing molecular orbital. The WFAT yields an e...

[Phys. Rev. A 96, 013423] Published Tue Jul 25, 2017

]]>For an efficient performance of atom-trap trace analysis, it is important to collimate the particles emitted from an effusive source. Their high velocity limits the interaction time with the cooling laser. Therefore, forces beyond the limits of the scattering force are desirable. The bichromatic for...

[Phys. Rev. A 96, 013424] Published Tue Jul 25, 2017

]]>We use the sensitive response to electric fields of Rydberg atoms to characterize all three vector components of the local electric field close to an atom-chip surface. We measured Stark-Zeeman maps of $S$ and $D$ Rydberg states using an elongated cloud of ultracold rubidium atoms (temperature $T\sim 2.5\phantom{\rule{4pt}{0ex}}\mu \mathrm{K}$) ...

[Phys. Rev. A 96, 013425] Published Tue Jul 25, 2017

]]>We theoretically study a three-dimensional weakly interacting Bose gas with Raman-induced spin-orbit coupling at finite temperature. By employing a generalized Hartree-Fock-Bogoliubov theory with Popov approximation, we determine a complete finite-temperature phase diagram of three exotic condensati...

[Phys. Rev. A 96, 013625] Published Tue Jul 25, 2017

]]>The influence of the Casimir-Polder potential upon matter-wave scattering near a dielectric disk is considered. We employ a rescaled Dyson series in order to take into account the disk geometry, and compare this with a previously used approach based on the proximity-force approximation. In the latte...

[Phys. Rev. A 96, 013626] Published Tue Jul 25, 2017

]]>The coherence times achieved with continuous dynamical decoupling techniques are often limited by fluctuations in the driving amplitude. In this work, we use time-dependent phase-modulated continuous driving to increase the robustness against such fluctuations in a dense ensemble of nitrogen-vacancy...

[Phys. Rev. A 96, 013850] Published Tue Jul 25, 2017

]]>We describe coherent Raman scattering in a complete spherical formalism allowing a better understanding of the coherent Raman process with respect to its symmetry properties, which is especially helpful in polarized coherent Raman microscopy. We describe how to build the coherent Raman tensor from s...

[Phys. Rev. A 96, 013851] Published Tue Jul 25, 2017

]]>We propose a mechanism of ground-state blockade between two $N$-type Rydberg atoms by virtue of the Rydberg-antiblockade effect and the Raman transition. Inspired by the quantum Zeno effect, the strong Rydberg antiblockade interaction plays a role in frequently measuring one ground state of two, leadi...

[Phys. Rev. A 96, 012328] Published Mon Jul 24, 2017

]]>Double-electron excitations in electron collisions with ${\mathrm{NH}}_{3}$ are investigated in the range of the outer valence and inner valence excitations by means of angle-resolved electron-photon coincidence measurements. Double-electron and single-electron excitations are termed double and single excitations, ...

[Phys. Rev. A 96, 012706] Published Mon Jul 24, 2017

]]>We present the macroscopic scaling of high harmonics generated by two-color laser pulses interacting with Ne gas in a hollow waveguide. We demonstrate that the divergence of harmonics is inversely proportional to the waveguide radius and harmonic yields are proportional to the square of the waveguid...

[Phys. Rev. A 96, 013422] Published Mon Jul 24, 2017

]]>We study the generation of atom vortex beams in the case where a Bose-Einstein condensate, released from a trap and moving in free space, is diffracted from a properly tailored light mask with a spiral transverse profile. We show how such a diffraction scheme could lead to the production of an atomi...

[Phys. Rev. A 96, 013622] Published Mon Jul 24, 2017

]]>We investigate the cooling produced by a loss process nonselective in energy on a one-dimensional (1D) Bose gas with repulsive contact interactions in the quasicondensate regime. By performing nonlinear classical-field calculations for a homogeneous system, we show that the gas reaches a nonthermal ...

[Phys. Rev. A 96, 013623] Published Mon Jul 24, 2017

]]>The Pancharatnam phase belongs to the family of geometric Berry phases. We use this optical phase to control the phase of our atom interferometer, which involves diffraction of the atom wave by laser standing waves in the Bragg regime. The Pancharatnam phase of the reflected beam of one standing wav...

[Phys. Rev. A 96, 013624] Published Mon Jul 24, 2017

]]>In the absence of external excitation, light trapped within a dielectric medium generally decays by leaking out, and also by getting absorbed within the medium. We analyze the leaky modes of solid dielectric spheres by examining solutions of Maxwell's equations for simple homogeneous, isotropic, lin...

[Phys. Rev. A 96, 013846] Published Mon Jul 24, 2017

]]>Hybrid systems of cold atoms and optical cavities are promising systems for increasing the stability of laser oscillators used in quantum metrology and atomic clocks. In this paper we map out the atom-cavity dynamics in such a system and demonstrate limitations as well as robustness of the approach....

[Phys. Rev. A 96, 013847] Published Mon Jul 24, 2017

]]>Superluminal propagation of light is a well-established phenomenon and has motivated immense research interest that has led to state-of-the-art knowledge and potential applications in the emerging technology of quantum optics and photonics. This study presents a theoretical analysis of the gain-assi...

[Phys. Rev. A 96, 013848] Published Mon Jul 24, 2017

]]>The quantum Rabi model is in the scientific spotlight due to the recent theoretical and experimental progress. Nevertheless, a full-fledged classification of its coupling regimes remains as a relevant open question. We propose a spectral classification dividing the coupling regimes into three region...

[Phys. Rev. A 96, 013849] Published Mon Jul 24, 2017

]]>We address the problem of whether parties who cannot communicate but share nonsignaling quantum correlations between the outcomes of sharp measurements can distinguish, just from the value of a correlation observable, whether their outcomes were produced by sequential compatible measurements on sing...

[Phys. Rev. A 96, 012122] Published Fri Jul 21, 2017

]]>We propose a dissipative scheme for one-step generation of continuous-variable quadripartite cluster states in a circuit QED setup consisting of four superconducting coplanar waveguide resonators and a gap-tunable superconducting flux qubit. With external driving fields to adjust the desired qubit-r...

[Phys. Rev. A 96, 012327] Published Fri Jul 21, 2017

]]>We calculated the magnetic dipole and the electric quadrupole hyperfine interaction constants of $3s3p{\phantom{\rule{0.16em}{0ex}}}^{3,1}{P}_{1}^{o}$ states and the isotope shift, including mass and field shift, factors for transitions from these two states to the ground state $3\mathrm{s}{}^{2\phantom{\rule{0.16em}{0ex}}1}{S}_{0}$ in ${\mathrm{Al}}^{+}$ ions using the multiconfiguration Dirac-Hartree-Fo...

[Phys. Rev. A 96, 012514] Published Fri Jul 21, 2017

]]>We investigate interference and correlation effects when several detuned emitters are placed along a one-dimensional photonic waveguide. Such a setup allows multiple interactions between the photons and the strongly coupled emitters, and underlies proposed devices for quantum information processing....

[Phys. Rev. A 96, 013842] Published Fri Jul 21, 2017

]]>The determination of a clear theoretical demarcation between a true or a false quadratic or higher-order low-intensity optical effect induced by an externally applied static or quasistatic (dc) vector field in anisotropic crystals is the scope of the present work. A complete set of necessary and suf...

[Phys. Rev. A 96, 013843] Published Fri Jul 21, 2017

]]>We introduce a scheme for remote entanglement generation for the photon polarization. The technique is based on transferring the initial frequency correlations to specific polarization-frequency correlations by local dephasing and their subsequent removal by frequency up-conversion. On fundamental l...

[Phys. Rev. A 96, 013844] Published Fri Jul 21, 2017

]]>We derive the analytical solution of the model of a two-state system interacting with an external coherent field, in which the Hamiltonian is pseudo-Hermitian. We describe in detail the non-Hermitian generalization of the famed Landau-Zener-Stückelberg-Majorana model, but similar generalizations can...

[Phys. Rev. A 96, 013845] Published Fri Jul 21, 2017

]]>It is commonly claimed that only Hamiltonians with a spectrum unbounded both above and below can give purely exponential decay. Because such Hamiltonians have no ground state, they are considered unphysical. Here we show that Hamiltonians that are bounded below can give purely exponential decay. Thi...

[Phys. Rev. A 96, 010103(R)] Published Thu Jul 20, 2017

]]>We propose and implement a lattice scheme for coherently manipulating atomic spins. Using a vector light shift and a superlattice structure, we demonstrate experimentally its capability on addressing spins in double wells and square plaquettes with subwavelength resolution. The quantum coherence of ...

[Phys. Rev. A 96, 011602(R)] Published Thu Jul 20, 2017

]]>We consider two different types of conditions which were proposed to test macrorealism in the context of a system described by a single dichotomic variable $Q$. This is the view that a macroscopic system evolving in time possesses definite properties which can be determined without disturbing the futu...

[Phys. Rev. A 96, 012121] Published Thu Jul 20, 2017

]]>Arbitrary rotation of a qubit can be performed with a three-pulse sequence, for example, $ZYZ$ rotations. However, this requires precise control of the relative phase and timing between the pulses, making it technically challenging in optical implementation in a short time scale. Here we show any $ZYZ$ ...

[Phys. Rev. A 96, 012326] Published Thu Jul 20, 2017

]]>We consider above-threshold ionization of hydrogen atoms in ultrastrong laser fields. We use a time-dependent Dirac equation as a calculational tool. This framework allows one to include relativistic effects such as nondipole effects, effects of the relativistic kinematics, and electron spin effects...

[Phys. Rev. A 96, 013419] Published Thu Jul 20, 2017

]]>Attosecond time delays in laser-assisted photoionization are studied for closed-shell negative ions. At low photoelectron energies, it is found that the Wigner-like delay cannot be simply extracted experimentally due to the nonuniversal form that the continuum-continuum delay takes.

[Phys. Rev. A 96, 013420] Published Thu Jul 20, 2017

]]>Using time-dependent density functional theory (TDDFT) calculations, we compare tunneling ionization of the $a\phantom{\rule{0.16em}{0ex}}{}^{4}F$ ground state and the $a\phantom{\rule{0.16em}{0ex}}{}^{6}D$ first excited state of vanadium in laser fields of intensities between 1.4 and $4.0\times {10}^{13}\phantom{\rule{4pt}{0ex}}\mathrm{W}\phantom{\rule{0.16em}{0ex}}{\mathrm{cm}}^{-2}$. The calculated ionization yields of the ground state of vanadium were...

[Phys. Rev. A 96, 013421] Published Thu Jul 20, 2017

]]>Several recent experiments have reported a variety of new collective behaviors of two atoms in a cavity. An important experimental result was that the back-reaction in a high-quality cavity leads to subradiance rather than superradiance. Further investigation by changing the parameter domain has sho...

[Phys. Rev. A 96, 013839] Published Thu Jul 20, 2017

]]>A detailed stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers (VCSELs) is presented. We consider both steady-state and dynamical regimes. In the case of steady-state operation, we carry out a small-signal (asymptotic) stability analysis of the steady-state s...

[Phys. Rev. A 96, 013840] Published Thu Jul 20, 2017

]]>We report bound states in the radiation continuum (BICs) in a single infinitely long dielectric rod with periodically stepwise modulated permittivity alternating from ${\epsilon}_{1}$ to ${\epsilon}_{2}$. For ${\epsilon}_{2}=1$ in air the rod is equivalent to a stack of dielectric disks with permittivity ${\epsilon}_{1}$. Because of rotational and transl...

[Phys. Rev. A 96, 013841] Published Thu Jul 20, 2017

]]>We report the experimental observation of high-order sideband transitions at the single-photon level in a quantum circuit system of a flux qubit ultrastrongly coupled to a coplanar waveguide resonator. With the coupling strength reaching 10% of the resonator's fundamental frequency, we obtain clear ...

[Phys. Rev. A 96, 012325] Published Wed Jul 19, 2017

]]>We present the hypersatellite Auger spectrum of neon which contains the decay transitions of the ${K}^{-2},{K}^{-2}V,{K}^{-2}{L}^{-1},{K}^{-2}{L}^{-1}V$, and ${K}^{-1}{L}^{-1}V$ states. The Auger decays of these types of core-hole states show different line shapes and linewidths which can be distinguished due to the high experimental resol...

[Phys. Rev. A 96, 012513] Published Wed Jul 19, 2017

]]>We study the generation of nonlocal correlations by atomic interactions in a pair of bimodal Bose-Einstein condensates in state-dependent potentials including spatial dynamics. The wave functions of the four components are described by combining a Fock state expansion with a time-dependent Hartree-F...

[Phys. Rev. A 96, 013621] Published Wed Jul 19, 2017

]]>We study a squeezed vacuum field generated in hot Rb vapor via the polarization self-rotation effect. Our previous experiments showed that the amount of observed squeezing may be limited by the contamination of the squeezed vacuum output with higher-order spatial modes, also generated inside the cel...

[Phys. Rev. A 96, 013835] Published Wed Jul 19, 2017

]]>Traditional optical frequency conversion model is well improved in this work. In terms of the dyadic Green's function method, a set of coupled-amplitude equations is reduced under a proposed transition layer assumption, accompanying the simultaneous integral equations. The model, as a generalization...

[Phys. Rev. A 96, 013836] Published Wed Jul 19, 2017

]]>We systematically investigate the bistable behavior and squeezing property of the librational mode of a levitated nonspherical nanoparticle trapped by laser beams. By expanding the librational potential to the fourth order of the librational angle $\theta $, we find that the nonlinear coefficient of this mo...

[Phys. Rev. A 96, 013837] Published Wed Jul 19, 2017

]]>We adopt a variational technique to study the dynamics of perturbed dissipative solitons whose evolution is governed by a Ginzburg-Landau equation (GLE). As a specific example of such solitons, we consider a silicon-based active waveguide in which free carriers are generated through two-photon absor...

[Phys. Rev. A 96, 013838] Published Wed Jul 19, 2017

]]>[Phys. Rev. A 96, 019902] Published Wed Jul 19, 2017

]]>We propose a method for protecting fragile quantum superpositions in many-particle systems from dephasing by external classical noise. We call superpositions “fragile” if dephasing occurs particularly fast, because the noise couples very differently to the superposed states. The method consists of l...

[Phys. Rev. A 96, 012119] Published Tue Jul 18, 2017

]]>Objectivity constitutes one of the main features of the macroscopic classical world. An important aspect of the quantum-to-classical transition issue is to explain how such a property arises from the microscopic quantum theory. Recently, within the framework of open quantum systems, there has been p...

[Phys. Rev. A 96, 012120] Published Tue Jul 18, 2017

]]>We consider quantum algorithms for the unique sink orientation problem on cubes. This problem is widely considered to be of intermediate computational complexity. This is because there is no known polynomial algorithm (classical or quantum) for the problem and yet it arises as part of a series of pr...

[Phys. Rev. A 96, 012323] Published Tue Jul 18, 2017

]]>Bulk diamond phonons have been shown to be a versatile platform for the generation, storage, and manipulation of high-bandwidth quantum states of light. Here we demonstrate a diamond quantum memory that stores, and releases on demand, an arbitrarily polarized $\sim 250$ fs duration photonic qubit. The sin...

[Phys. Rev. A 96, 012324] Published Tue Jul 18, 2017

]]>Two different effects of the blackbody-radiation-induced atomic line broadening are compared. The first one (stimulated Raman scattering) has been discussed by many authors; the second one (quadratic level mixing) was discussed in our previous work. It is shown that the mixing effect gives the most ...

[Phys. Rev. A 96, 012512] Published Tue Jul 18, 2017

]]>The release of the highly reactive radical ${\mathrm{OH}}^{+}$ from the fragmentation of water by electron impact is made mostly through the ${\mathrm{OH}}^{+}+{\mathrm{H}}^{0}$ channel. This channel ejects suprathermal ${\mathrm{OH}}^{+}$ ions with a kinetic energy distribution whose details are unexplored so far due to the difficulty in experimentally charac...

[Phys. Rev. A 96, 012705] Published Tue Jul 18, 2017

]]>A simple rate-equation description of the heating and cooling of antiparticle clouds under conditions typical of those found in antihydrogen formation experiments is developed and analyzed. We include single-particle collisional, radiative, and cloud expansion effects and, from the modeling calculat...

[Phys. Rev. A 96, 013418] Published Tue Jul 18, 2017

]]>We study the quantum dynamics of the Bose-Hubbard model on a ladder formed by two rings coupled by the tunneling effect. By implementing the Bogoliubov approximation scheme, we prove that, despite the presence of the inter-ring coupling term, the Hamiltonian decouples in many independent sub-Hamilto...

[Phys. Rev. A 96, 013620] Published Tue Jul 18, 2017

]]>A candidate for converting quantum information from microwave to optical frequencies is the use of a single atom that interacts with a superconducting microwave resonator on one hand and an optical cavity on the other. The large electric dipole moments and microwave transition frequencies possessed ...

[Phys. Rev. A 96, 013833] Published Tue Jul 18, 2017

]]>We report on the extreme-value statistics of output intensities in a one-dimensional cw-pumped erbium-doped random fiber laser, with a strongly scattering disordered medium consisting of randomly spaced Bragg gratings. The experimental findings from the analysis of a large number of emission spectra...

[Phys. Rev. A 96, 013834] Published Tue Jul 18, 2017

]]>We examine the Green function and the density of states for fermions moving in three-dimensional Dirac materials with interfaces which affect the propagation properties of particles. Motivation for our research comes from interest in materials that exhibit quasirelativistic dispersion relations. By ...

[Phys. Rev. A 96, 012118] Published Mon Jul 17, 2017

]]>We study the problem of designing optical receivers to discriminate between multiple coherent states using *coherent processing* receivers—i.e., one that uses arbitrary coherent feedback control and quantum-noise-limited direct detection—which was shown by Dolinar to achieve the minimum error probabil...

[Phys. Rev. A 96, 012320] Published Mon Jul 17, 2017

]]>Entangled quantum states, such as NOON states, are of major importance for quantum technologies due to their quantum-enhanced performance. At the same time, their quantum correlations are relatively vulnerable when they are subjected to imperfections. Therefore, it is crucial to determine under whic...

[Phys. Rev. A 96, 012321] Published Mon Jul 17, 2017

]]>Noninteracting bosons were proposed to be used for a demonstration of quantum-computing supremacy in a boson-sampling setup. A similar demonstration with fermions would require that the fermions are initially prepared in an entangled state. I suggest that pairwise entanglement of fermions would be s...

[Phys. Rev. A 96, 012322] Published Mon Jul 17, 2017

]]>We investigate roles of electron correlation effects in the determination of the ${g}_{j}$ factors of the $4s\phantom{\rule{0.16em}{0ex}}{}^{2}{S}_{1/2}$, $4p\phantom{\rule{0.16em}{0ex}}{}^{2}{P}_{1/2}$, $4p\phantom{\rule{0.16em}{0ex}}{}^{2}{P}_{3/2}$, $3d\phantom{\rule{0.16em}{0ex}}{}^{2}{D}_{3/2}$, and $3d\phantom{\rule{0.16em}{0ex}}{}^{2}{D}_{5/2}$ states, representing different parities and angular momenta, of the ${\mathrm{Ca}}^{+}$ ion. Correlation contributions are highlighted with respect to the mean-field val...

[Phys. Rev. A 96, 012511] Published Mon Jul 17, 2017

]]>Vibrational state-resolved photoelectron anisotropy parameters, $\beta $, for the $\stackrel{\u0303}{X}{\phantom{\rule{0.16em}{0ex}}}^{2}{B}_{1}$, $\stackrel{\u0303}{B}\phantom{\rule{0.16em}{0ex}}{}^{2}{B}_{2}$, and $\stackrel{\u0303}{C}{\phantom{\rule{0.28em}{0ex}}}^{2}{B}_{1}$ state ionizations of bromobenzene have been recorded at photon energies ranging from 20.5 to 94 eV, thus spanning the region of the expected bromine Cooper minimum (CM). The $\stackrel{\u0303}{X}$ state displays no CM and...

[Phys. Rev. A 96, 013413] Published Mon Jul 17, 2017

]]>We study photoelectron angular distributions (PADs) near the ionization threshold with a newly developed Coulomb quantum-orbit strong-field approximation (CQSFA) theory. The CQSFA simulations exhibit an excellent agreement with the result from the time-dependent Schrödinger equation. We show that th...

[Phys. Rev. A 96, 013414] Published Mon Jul 17, 2017

]]>The common objective of the application of adiabatic techniques in the field of quantum control is to transfer a quantum system from one discrete energy state to another. These techniques feature both high efficiency and insensitivity to variations in the experimental parameters, e.g., variations in...

[Phys. Rev. A 96, 013415] Published Mon Jul 17, 2017

]]>The anticrossing structure of the $1s7l$ manifold of the helium atom in combined dc electric and magnetic fields is studied using a broadband photoexcitation with synchrotron light. The anticrossing signal is provided by the yield of atoms in the metastable $1s2s$ states to which the $1s7l$ states cascade...

[Phys. Rev. A 96, 013416] Published Mon Jul 17, 2017

]]>Efficient cooling of trapped ions is a prerequisite for various applications of the ions in precision spectroscopy, quantum information, and coherence control. Raman sideband cooling is an effective method to cool the ions to their motional ground state. We investigate both numerically and experimen...

[Phys. Rev. A 96, 013417] Published Mon Jul 17, 2017

]]>We consider a binary dipolar Bose-Einstein condensate with repulsive contact and dipolar interactions under rotation. Our results show that the interplay among short-range interaction, long-range interaction, and rotation can give rise to a rich variety of topological configurations, including giant...

[Phys. Rev. A 96, 013619] Published Mon Jul 17, 2017

]]>We present a general, Gaussian spatial-mode propagation formalism for describing the generation of higher-order multi-spatial-mode beams generated during nonlinear interactions. Furthermore, to implement the theory, we simulate optical angular momentum transfer interactions and show how one can opti...

[Phys. Rev. A 96, 013830] Published Mon Jul 17, 2017

]]>We study analytically and numerically the optical analog of the Jackiw-Rebbi states in quantum-field theory. These solutions exist at the interface of two binary waveguide arrays, which are described by two Dirac equations with masses of opposite sign. We show that these special states are topologic...

[Phys. Rev. A 96, 013831] Published Mon Jul 17, 2017

]]>An optical diode made of an asymmetric cavity containing a two-level atom is investigated. We focus on the quantum-statistical property of the transmitted field with nonclassical light input. Both coherent and squeezed light inputs have been considered. The results show that the transmitted contrast...

[Phys. Rev. A 96, 013832] Published Mon Jul 17, 2017

]]>The problem of bounding the (Abelian) many-anyon ground-state energy from above, with a dependence on the statistics parameter which matches that of currently available lower bounds, is reduced to studying the correlation functions of Moore-Read (Pfaffian) and Read-Rezayi type clustering states.

[Phys. Rev. A 96, 012116] Published Fri Jul 14, 2017

]]>A pivotal task in quantum metrology, and quantum parameter estimation in general, is to design schemes that achieve the highest precision with the given resources. Standard models of quantum metrology usually assume that the dynamics is fixed and that the highest precision is achieved by preparing t...

[Phys. Rev. A 96, 012117] Published Fri Jul 14, 2017

]]>We present measurements of interspecies thermalization between ultracold samples of ${}^{133}\mathrm{Cs}$ and either ${}^{174}\mathrm{Yb}$ or ${}^{170}\mathrm{Yb}$. The two species are trapped in a far-off-resonance optical dipole trap and ${}^{133}\mathrm{Cs}$ is sympathetically cooled by Yb. We extract effective interspecies thermalization cross sections by fi...

[Phys. Rev. A 96, 012704] Published Fri Jul 14, 2017

]]>We have studied $\mathrm{X}{\mathrm{e}}^{+}4d$ inner-shell photoionization in a direct experiment on $\mathrm{X}{\mathrm{e}}^{+}$ ions, merging an ion and a photon beam and detecting the ejected electrons with a cylindrical mirror analyzer. The measured $4d$ photoelectron spectrum is compared to the $4d$ core valence double ionization spectrum of the n...

[Phys. Rev. A 96, 013412] Published Fri Jul 14, 2017

]]>The interaction blockade phenomenon isolates the motion of a single quantum particle within a multiparticle system, in particular for coherent oscillations in and out of a region affected by the blockade mechanism. For identical quantum particles with Bose statistics, the presence of the other parti...

[Phys. Rev. A 96, 013616] Published Fri Jul 14, 2017

]]>We address the time evolution of two- and three-dimensional nonrelativistic Gaussian wave packets in the presence of a weak external potential of arbitrary functional form. The focus of our study is the phenomenon of rotation of a Gaussian wave packet around its center of mass, as quantified by mean...

[Phys. Rev. A 96, 013617] Published Fri Jul 14, 2017

]]>We explore the impact of dimensionality on the scattering of a small bosonic ensemble in an elongated harmonic trap off a centered repulsive barrier, thereby taking particle correlations into account. The loss of coherence as well as the oscillation of the center of mass are studied and we analyze t...

[Phys. Rev. A 96, 013618] Published Fri Jul 14, 2017

]]>With Maxwell-Bloch equations how the superradiance can lead to amplification and gain at a frequency much larger than the pumping frequency has been shown. This remarkable effect has been examined in terms of a simpler model involving two coupled oscillators, with one of them parametrically driven. ...

[Phys. Rev. A 96, 013827] Published Fri Jul 14, 2017

]]>The damped driven nonlinear Schrödinger equation (NLSE) has been used to understand a range of physical phenomena in diverse systems. Studying this equation in the context of optical hyperparametric oscillators in anomalous-dispersion dissipative cavities, where NLSE is usually referred to as the Lu...

[Phys. Rev. A 96, 013828] Published Fri Jul 14, 2017

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