Quadrupole shifts for three prominent clock transitions, [4f^{14}6s]^{2}S_{1/2}→[4f^{14}5d]^{2}D_{3/2}, [4f^{14}6s]^{2}S_{1/2}→[4f^{14}5d]^{2}D_{5/2}, and [4f^{14}6s]^{2}S_{1/2}→[4f^{13}6s^{2}]^{2}F_{7/2}, in the Yb^{+} ion are investigated by calculating values of the quadrupole moment (Θ) for the 5d_{3/2,5/2} and 4f_{7/2} states using the relativistic coupled-cl...

[Phys. Rev. A 90, 050503] Published Wed Nov 26, 2014

]]>Exciton sizes and electron-hole binding energies, which are central properties of excited states in extended systems and crucial to the design of modern electronic devices, are readily defined within a quasiparticle framework but are quite challenging to understand in the molecular-orbital picture. ...

[Phys. Rev. A 90, 052521] Published Wed Nov 26, 2014

]]>We propose an approach for describing the effective electronic states of atoms in compounds to study the properties of molecules and condensed matter, which are circumscribed by the operators heavily concentrated in atomic cores. Among the properties are hyperfine structure, space parity (P) and tim...

[Phys. Rev. A 90, 052522] Published Wed Nov 26, 2014

]]>We performed charge-exchange experiments with the electron-beam ion trap and an x-ray calorimeter spectrometer at the Lawrence Livermore National Laboratory. We compare the relative strength of the high-n Lyman series emission for different combinations of ions and neutral gases. Theoretical predic...

[Phys. Rev. A 90, 052723] Published Wed Nov 26, 2014

]]>The dynamics of a vortex dipole in a spin-1 Bose-Einstein condensate in which magnetic phases are spatially distributed is investigated. When a vortex dipole travels from the ferromagnetic phase to the polar phase, or vice versa, it penetrates the phase boundary and transforms into one of the variou...

[Phys. Rev. A 90, 053632] Published Wed Nov 26, 2014

]]>We investigate the interaction energy and the possibility of itinerant ferromagnetism in a strongly interacting Fermi gas at zero temperature in the absence of molecule formation. The interaction energy is obtained by summing the perturbative contributions of Galitskii-Feynman type to all orders in ...

[Phys. Rev. A 90, 053633] Published Wed Nov 26, 2014

]]>We show analytically that the collapse and revival in the population dynamics of the atom-cavity coupled system under the rotating wave approximation (RWA), valid only at very weak coupling, is an artifact as the atom-cavity coupling is increased. Even the first-order correction to the RWA is able t...

[Phys. Rev. A 90, 053848] Published Wed Nov 26, 2014

]]>Besides the two fundamental symmetric and antisymmetric modes, a thin metal slab surrounded by a dielectric medium supports an infinite number of other modes whose propagation distances, however, are extremely short. We show that such a higher-order mode, normally not regarded to be useful, can turn...

[Phys. Rev. A 90, 053849] Published Wed Nov 26, 2014

]]>We use an analytical method to study the dissipative dynamics of a two-level system (TLS) under a harmonic driving. The method is based on a combination of the unitary transformation and Born–Markov master-equation approach. Our main aim is to clarify the effects of counter-rotating (CR) terms of bo...

[Phys. Rev. A 90, 053850] Published Wed Nov 26, 2014

]]>The impact of nonadiabatic laser-induced molecular alignment on filamentation is numerically studied. Weak- and strong-field models of impulsive molecular alignment are compared in the context of nonlinear pulse propagation. It is shown that the widely used weak-field model describing the refractive...

[Phys. Rev. A 90, 053851] Published Wed Nov 26, 2014

]]>We present a quantum master equation describing a Bose-Einstein condensate with particle loss on one lattice site and particle gain on the other lattice site whose mean-field limit is a non-Hermitian PT-symmetric Gross-Pitaevskii equation. It is shown that the characteristic properties of PT-symmetr...

[Phys. Rev. A 90, 052120] Published Tue Nov 25, 2014

]]> A definitive determination of the nature of the approach to the critical charge is illustrated for the (1s^{2}2s3s)^{1,3}S and the (1s^{2}2s3p)^{1,3}P states of the Be isoelectronic series. The features that conclusively indicate that the outermost orbital becomes an infinitely diffuse hydrogenlike orbital upon...

[Phys. Rev. A 90, 052519] Published Tue Nov 25, 2014

]]>Relativistic dipolar to hexadecapolar polarizabilities of the ground state and some excited states of hydrogenic atoms are calculated by using numerically exact energies and wave functions obtained from the Dirac equation with the Lagrange-mesh method. This approach is an approximate variational met...

[Phys. Rev. A 90, 052520] Published Tue Nov 25, 2014

]]>Experimental cross sections and cross-section ratios reported in the literature for direct double ionization of the outer shells of helium, neon, and argon atoms resulting from bare ions ranging from protons to uranium and for antiprotons are analyzed in terms of a first- and second-order interferen...

[Phys. Rev. A 90, 052721] Published Tue Nov 25, 2014

]]>We theoretically investigate the control of a magnetic Feshbach resonance using a bound-to-bound molecular transition driven by spatially modulated laser light. Due to the spatially periodic coupling between the ground and excited molecular states, there exists a band structure of bound states, whic...

[Phys. Rev. A 90, 052722] Published Tue Nov 25, 2014

]]> Rydberg states of atomic helium with principal quantum numbers ranging from n=20 to n=100 have been prepared by non-resonance-enhanced single-color two-photon excitation from the metastable 2 ^{3}S_{1} state. Photoexcitation was carried out using linearly and circularly polarized pulsed laser radiation. I...

[Phys. Rev. A 90, 053430] Published Tue Nov 25, 2014

]]>We consider a polarized Fermi gas in the BCS-BEC crossover region above the critical temperature within a T-matrix formalism. By treating the mean-field-like shift of the quasiparticle energies in a self-consistent manner, we avoid the known pathological behavior of the standard Nozières-Schmitt-Rin...

[Phys. Rev. A 90, 053629] Published Tue Nov 25, 2014

]]>Time-of-flight images are a common tool in ultracold atomic experiments, employed to determine the quasimomentum distribution of the interacting particles. If one introduces a constant artificial electric field, then the quasimomentum distribution evolves in time as Bloch oscillations are generated ...

[Phys. Rev. A 90, 053630] Published Tue Nov 25, 2014

]]>We propose a scheme to investigate the interplay between the Kondo-exchange interaction and the quantum spin Hall effect with ultracold fermionic alkaline-earth-metal atoms trapped in two-dimensional optical lattices using ultracold collision and laser-assisted tunneling. In the strong Kondo-couplin...

[Phys. Rev. A 90, 053631] Published Tue Nov 25, 2014

]]>We investigate the polarization of odd versus even high-order-harmonic generation (HHG) from oriented asymmetric molecules exposed to a strong and linearly polarized laser field. Our numerical simulations show that the properties of polarization of harmonics at diverse orientation angles differ sign...

[Phys. Rev. A 90, 053844] Published Tue Nov 25, 2014

]]>We study experimentally and theoretically the response of a superradiant or bad-cavity laser to an applied coherent drive. We observe two forms of synchronization (injection locking) between the superradiant ensemble and the applied drive: one attractive and one repulsive in nature. In the region of...

[Phys. Rev. A 90, 053845] Published Tue Nov 25, 2014

]]>We propose a definition for the efficiency that can be universally applied to all classes of quantum optical detectors. This definition is based on the maximum amount of optical loss that a physically plausible device can experience while still replicating the properties of a given detector. We prov...

[Phys. Rev. A 90, 053846] Published Tue Nov 25, 2014

]]>The concept of ponderomotive potential is upgraded to a regime in which radiation friction becomes dominant. The radiation friction manifests itself in long-term capturing of the particles released at the focus and impenetrability of the focus from the exterior. We apply time scale separation to the...

[Phys. Rev. A 90, 053847] Published Tue Nov 25, 2014

]]>In [Phys. Rev. A 90, 023833 (2014)PLRAAN10.1103/PhysRevA.90.023833], we offer a solution to the problem of constructing a scattering potential v(x) which possesses scattering properties of one's choice at an arbitrarily prescribed wave number. This solution involves expressing v(x) as the sum of n≤6...

[Phys. Rev. A 90, 055803] Published Tue Nov 25, 2014

]]>[Phys. Rev. A 90, 059904] Published Tue Nov 25, 2014

]]>We derive a steering inequality based on a fine-grained uncertainty relation to capture Einstein-Podolsky-Rosen steering for bipartite systems. Our steering inequality improves over previous ones since it can experimentally detect all steerable two-qubit Werner state with only two measurement settin...

[Phys. Rev. A 90, 050305] Published Mon Nov 24, 2014

]]>We simulate a balanced attractively interacting two-component Fermi gas in a one-dimensional lattice perturbed with a moving potential well or barrier. Using the time-evolving block decimation (TEBD) method, we study different velocities of the perturbation and distinguish two velocity regimes based...

[Phys. Rev. A 90, 051603] Published Mon Nov 24, 2014

]]>The distributions of Compton and Thomson radiation for a shaped laser pulse colliding with a free electron are calculated in the framework of quantum and classical electrodynamics, respectively. We introduce a scaling law for the Compton and the Thomson frequency distributions which universally appl...

[Phys. Rev. A 90, 052117] Published Mon Nov 24, 2014

]]>Exchange of information between a quantum system and its surrounding environment plays a fundamental role in the study of the dynamics of open quantum systems. Here we discuss the role of the information exchange in the non-Markovian behavior of dynamical quantum processes following the decoherence ...

[Phys. Rev. A 90, 052118] Published Mon Nov 24, 2014

]]>The continuous spontaneous localization (CSL) theory alters the Schrödinger equation. It describes wave-function collapse as a dynamical process instead of an ill-defined postulate, thereby providing macroscopic uniqueness and solving the so-called measurement problem of standard quantum theory. CSL...

[Phys. Rev. A 90, 052119] Published Mon Nov 24, 2014

]]>One of the most intriguing features of entanglement is that entangled quantum systems exhibit exchange symmetry; that is, local quantum operations on the subsystems may be interchanged without affecting the quantum state. In this work, we investigate whether the exchange symmetry is preserved for th...

[Phys. Rev. A 90, 052328] Published Mon Nov 24, 2014

]]>We experimentally demonstrate the freezing of evolution of quantum states in one- and two-dimensional subspaces of two qubits, on an NMR quantum information processor. State evolution was frozen and leakage of the state from its subspace to an orthogonal subspace was successfully prevented using sup...

[Phys. Rev. A 90, 052329] Published Mon Nov 24, 2014

]]> We show how to construct an arbitrary robust one-qubit unitary operation with a control Hamiltonian of A_{x}(t)σ_{x}+A_{y}(t)σ_{y}, where σ_{i} is a Pauli matrix and A_{i}(t) is piecewise constant. Our method, based on planar geometry, admits a simple and intuitive interpretation. Furthermore, the total execution tim...

[Phys. Rev. A 90, 052330] Published Mon Nov 24, 2014

]]>Pulses to steer the time evolution of quantum systems can be designed with optimal control theory. In most cases it is the coherent processes that can be controlled and one optimizes the time evolution toward a target unitary process, sometimes also in the presence of noncontrollable incoherent proc...

[Phys. Rev. A 90, 052331] Published Mon Nov 24, 2014

]]> The complete kinematics of single- and double-electron capture from neon to Ar^{16+} was measured with a reaction microscope at a projectile energy of 3.2 keV/u (velocity v_{p}=0.36 a.u.). Not only the change of the electronic binding energies (the Q value) and the projectile scattering angles, but also (...

[Phys. Rev. A 90, 052720] Published Mon Nov 24, 2014

]]>Quantum engineering of time-separated Raman laser pulses in three-level systems is presented to produce an ultranarrow optical transition in bosonic alkali-earth clocks free from light shifts and with a significantly reduced sensitivity to laser parameter fluctuations. Based on a quantum artificial ...

[Phys. Rev. A 90, 053427] Published Mon Nov 24, 2014

]]> We experimentally demonstrate the photodissociation process of Br_{2} molecules in the intense femtosecond laser field by a dc-sliced ion velocity map imaging technique. We show that four fragment ions Br^{n+} (n=1–4) are observed, and their kinetic energy increases while their angular distribution decrea...

[Phys. Rev. A 90, 053428] Published Mon Nov 24, 2014

]]>We investigated the temporal behavior of alignment and orientation of LiH following a femtosecond laser pulse excitation comprising two fields at center frequencies ω and 2ω (e.g., E(t)=E[cos(ωt)+cos(2ωt+Φ)]) shifted by a phase Φ. The effects of repopulations and rephasing of rotational states on th...

[Phys. Rev. A 90, 053429] Published Mon Nov 24, 2014

]]>We investigate two-component ultracold fermions loaded in a decorated honeycomb lattice described by the Hubbard model with repulsive interactions and nearest-neighbor hopping. The phase transitions are studied by combining the cellular dynamical mean-field theory with the continuous-time quantum Mo...

[Phys. Rev. A 90, 053627] Published Mon Nov 24, 2014

]]>We propose to cool a mechanical resonator close to its ground state via an electromagnetically-induced-transparency (EIT)-like cooling mechanism in a double-cavity optomechanical system, where an additional cavity couples to the original one in the standard optomechanical system. By choosing optimal...

[Phys. Rev. A 90, 053841] Published Mon Nov 24, 2014

]]>In this paper we investigate the quantum noise properties of polarization vortices in connection with an intensity-based Clauser-Horne-Shimony-Holt (CHSH) inequality for their spin-orbit separability. We evaluate the inequality for different input quantum states and the corresponding intensity fluct...

[Phys. Rev. A 90, 053842] Published Mon Nov 24, 2014

]]>We consider the propagation of terahertz (THz) pulses resonant with the lowest rotational levels in ammonia vapors at room temperature. We demonstrate a quasisimultonic regime of propagation for two-color THz pulses (their lossless simultaneous propagation with equal group velocities and stable enve...

[Phys. Rev. A 90, 053843] Published Mon Nov 24, 2014

]]>We study the electron scattering from the freely movable spin-1/2 proton in the presence of a linearly polarized laser field in the first Born approximation. The dressed state of the electron is described by a time-dependent wave function derived from a perturbation treatment (in a laser field). Wit...

[Phys. Rev. A 90, 055403] Published Mon Nov 24, 2014

]]>[Phys. Rev. A 90, 059902] Published Mon Nov 24, 2014

]]>[Phys. Rev. A 90, 059903] Published Mon Nov 24, 2014

]]>In this Rapid Communication we investigate the fluctuation effects on the transport properties of unitary Fermi gases in the vicinity of the superfluid transition temperature Tc. Based on the time-dependent Ginzburg-Landau formalism of the Bose-Einstein condensate–BCS crossover, we investigate both ...

[Phys. Rev. A 90, 051602] Published Fri Nov 21, 2014

]]>In this work we introduce a distorted-wave method, based on the initial value representation approach of the quantum evolution operator, in order to improve the description of rainbow effects given by the surface eikonal (SE) model for diffraction from crystal surfaces produced by grazing scattering...

[Phys. Rev. A 90, 052718] Published Fri Nov 21, 2014

]]>We use the dressed potentials obtained in the adiabatic representation of two coupled channels to calculate s-wave Feshbach resonances in a three-dimensional spherically symmetric potential with an open channel interacting with a closed channel. Analytic expressions for the s-wave scattering length ...

[Phys. Rev. A 90, 052719] Published Fri Nov 21, 2014

]]>First-principles quantum-mechanical calculations of an intense-field ultrafast two-color core-hole stimulated Raman process in nitric oxide are presented. They employ the multiconfiguration time-dependent Hartree-Fock (MCTDHF) method with all 15 electrons active. These calculations demonstrate a rob...

[Phys. Rev. A 90, 053426] Published Fri Nov 21, 2014

]]>The large-distance behavior of the density-density correlation function in the Lieb-Liniger model at finite temperature is investigated by means of the recently derived nonlinear integral equations characterizing the correlation lengths. We present extensive numerical results covering all the physic...

[Phys. Rev. A 90, 053626] Published Fri Nov 21, 2014

]]>We discuss the effect of semitransparency in a quantum-Zeno-like interaction-free measurement setup, a quantum-physics based approach that might significantly reduce sample damage in imaging and microscopy. With an emphasis on applications in electron microscopy, we simulate the behavior of probe pa...

[Phys. Rev. A 90, 053840] Published Fri Nov 21, 2014

]]>We study how non-Markovianity of an open two-level system can be detected when continuously monitoring a part of its bosonic environment. Considering a physical scenario of an atom in a lossy cavity, we demonstrate that the properties of the time-dependent flux of the photons from the cavity allows ...

[Phys. Rev. A 90, 054101] Published Fri Nov 21, 2014

]]>[Phys. Rev. A 90, 059901] Published Fri Nov 21, 2014

]]>A distribution of thermal states given by random Hamiltonians with a local structure is studied and it is shown that the ensemble of these states monotonically approaches the unitarily invariant ensemble with decreasing temperature if all particles interact according to a single random interaction and achieves a state t-design at a temperature O(1/ log(t)).

[Phys. Rev. A 90, 050304] Published Thu Nov 20, 2014

]]>We present a cavity piezo-optomechanical system where microwave and optical degrees of freedom are coupled through an ultrahigh-frequency mechanical resonator. By utilizing the coherence among the three interacting modes, we demonstrate optical amplification, coherent absorption, and a more general ...

[Phys. Rev. A 90, 051801] Published Thu Nov 20, 2014

]]>A pseudopotential for positronium-atom interaction, based on electron-atom and positron-atom phase shifts, is constructed, and the phase shifts for Ps-Kr and Ps-Ar scattering are calculated. This approach allows us to extend the Ps-atom cross sections, obtained previously in the impulse approximatio...

[Phys. Rev. A 90, 052717] Published Thu Nov 20, 2014

]]>We compute the normal form description of a semiconductor laser near its threshold, with the sole assumption that the polarization be related to the electric field through the susceptibility (dependent on laser frequency and population inversion). We prove both analytically and numerically the possi...

[Phys. Rev. A 90, 053838] Published Thu Nov 20, 2014

]]>We study the impact of double- and triple-scattering contributions on coherent backscattering of laser light from saturated isotropic atoms in the helicity-preserving polarization channel. By using the recently proposed diagrammatic pump-probe approach, we analytically derive single-atom spectral re...

[Phys. Rev. A 90, 053839] Published Thu Nov 20, 2014

]]>We provide a twofold extension of Landau-Pollak uncertainty relations for mixed quantum states and for positive operator-valued measures, by recourse to geometric considerations. The generalization is based on metrics between pure states, having the form of a function of the square of the inner prod...

[Phys. Rev. A 90, 052114] Published Wed Nov 19, 2014

]]>When a pair of photons that are entangled in terms of their transverse modes, such as an orbital angular momentum (OAM) basis, propagates through atmospheric turbulence, the scintillation causes a decay of the entanglement. Here, we use numerical simulations to study how this decoherence process dep...

[Phys. Rev. A 90, 052115] Published Wed Nov 19, 2014

]]>In this paper, we report on a laser spectroscopy measurement of 84−87Rb isotopes in superfluid helium (He ii) at 1.8 K using laser–radio-frequency double-resonance spectroscopy. Rb ion beams (>60 MeV/u) provided by the RIKEN projectile fragment separator (RIPS) were injected and trapped into He i...

[Phys. Rev. A 90, 052516] Published Wed Nov 19, 2014

]]>By only using electric-dipole forbidden emission lines, in what we label forbidden-line spectroscopy, we identified several energy levels in cadmium-like tungsten, W26+. The spectrum was recorded at the Shanghai permanent-magnet electron beam ion trap in the visible region. The identifications were ...

[Phys. Rev. A 90, 052517] Published Wed Nov 19, 2014

]]>We discuss a possible one-dimensional trapping and cooling of atoms and molecules due to their nonresonant interaction with counterpropagating light pulse trains. The counterpropagating pulses form a one-dimensional trap for atoms and molecules and a properly chosen carrier frequency detuning from t...

[Phys. Rev. A 90, 053421] Published Wed Nov 19, 2014

]]>A resonantly driven bosonic Josephson junction supports stable collective excitations, or quasiparticles, which constitute analogs of the Trojan wave packets previously explored with Rydberg atoms in strong microwave fields. We predict a quantum beating effect between such symmetry-related many-body...

[Phys. Rev. A 90, 053622] Published Wed Nov 19, 2014

]]>Topological states of interacting many-body systems are at the focus of current research due to the exotic properties of their elementary excitations. In this paper we suggest a realistic experimental setup for the realization of a simple version of such a phase. We show how δ-interacting bosons hop...

[Phys. Rev. A 90, 053623] Published Wed Nov 19, 2014

]]>Variational solutions of the Boltzmann equation usually rely on the concept of linear response. We extend the variational approach for tight-binding models at high entropies to a regime far beyond linear response. We analyze both weakly interacting fermions and incoherent bosons on a lattice. We con...

[Phys. Rev. A 90, 053624] Published Wed Nov 19, 2014

]]>A theory of dispersive soliton of the self-induced transparency in a medium consisting of atoms or semiconductor quantum dots of two types is considered. A two-component medium is modeled by a set of two-level atoms of two types embedded into a conductive host material. These types of atoms correspo...

[Phys. Rev. A 90, 053835] Published Wed Nov 19, 2014

]]>We study the manipulation of Goos-Hänchen (GH) shifts for the reflected and transmitted probe light pulses injected into a cavity containing four-level configuration mercury atoms where the probe transition is in the ultraviolet (UV) region with a wavelength of 253.7nm. Different behaviors of the GH...

[Phys. Rev. A 90, 053836] Published Wed Nov 19, 2014

]]>We present a two-waveguide coupler which realizes complete achromatic all-optical switching. The coupling of the waveguides has a hyperbolic-secant shape, while the phase mismatch has a sign flip at the maximum of the coupling. We derive an analytic solution for the electric field propagation using ...

[Phys. Rev. A 90, 053837] Published Wed Nov 19, 2014

]]>The unextendible product basis is generalized to the unextendible entangled basis with any arbitrarily given Schmidt number k (UEBk) for any bipartite system Cd⊗Cd′ (2≤k<d≤d′), which can also be regarded as a generalization of the unextendible maximally entangled basis. A general way of construct...

[Phys. Rev. A 90, 054303] Published Wed Nov 19, 2014

]]>The robustness of the three-level transitionless quantum driving proposed by Giannelli and Arimondo [L. Giannelli and E. Arimondo, Phys. Rev. A 89, 033419 (2014)PLRAAN10.1103/PhysRevA.89.033419] is investigated. In the case when the excited state is barely populated during the evolution, its decay r...

[Phys. Rev. A 90, 055402] Published Wed Nov 19, 2014

]]>Open quantum systems are studied from the thermodynamical point of view unifying the principle of maximum informational entropy and the hypothesis of relaxation times hierarchy. The result of the unification is a non-Markovian and local-in-time master equation that provides a direct connection for d...

[Phys. Rev. A 90, 052112] Published Tue Nov 18, 2014

]]>We propose an implementation of a twin-paradox scenario in superconducting circuits, with velocities as large as a few percent of the speed of light. Ultrafast modulation of the boundary conditions for the electromagnetic field in a microwave cavity simulates a clock moving at relativistic speeds. S...

[Phys. Rev. A 90, 052113] Published Tue Nov 18, 2014

]]>A continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol using squeezed states is proposed where the two legitimate partners send Gaussian-modulated squeezed states to an untrusted third party to realize the measurement. Security analysis shows that the pro...

[Phys. Rev. A 90, 052325] Published Tue Nov 18, 2014

]]>We calculated, using seven realistic He4-He4 potentials in the literature, the Efimov spectra of the He4 trimer and tetramer and analyzed the universality of the systems. The three-(four-)body Schrödinger equations were solved fully nonadiabatically with the high-precision calculation method employe...

[Phys. Rev. A 90, 052514] Published Tue Nov 18, 2014

]]>It is shown that small energy-level splittings of resonance states in highly charged ions can be extracted from the angular correlations of characteristic x rays emitted in radiative cascades, which may ultimately be used for new tests of QED in highly charged ions.

[Phys. Rev. A 90, 052515] Published Tue Nov 18, 2014

]]>The electric-dipole and quadrupole polarizabilities of the 5s5p3P1o state and the C6 and C8 coefficients for the 1S0+1S0 and 1S0+3P1o dimers of strontium are calculated using a high-precision relativistic approach that combines configuration interaction and linearized coupled-cluster methods. Our re...

[Phys. Rev. A 90, 052715] Published Tue Nov 18, 2014

]]>The main limitation of most ultracold chemistry studies to date is the lack of an analysis of reaction products. Here, we discuss a generally tractable, rigorous theoretical framework for computing statistical product-state distributions for ultracold reactions in external fields. We show that field...

[Phys. Rev. A 90, 052716] Published Tue Nov 18, 2014

]]>Beams of helium atoms in Rydberg states with principal quantum number n=52, and traveling with an initial speed of 1950 m/s, have been accelerated, decelerated, and guided while confined in moving electric traps generated above a curved, surface-based electrical transmission line with a segmented ce...

[Phys. Rev. A 90, 053420] Published Tue Nov 18, 2014

]]>We investigate the structure and dynamics of a rotating superfluid Bose-Fermi mixture (SBFM) made of superfluid bosons and two-component (spin-up and -down) superfluid fermions. A ground-state phase diagram for the nonrotating case of a SBFM with specific parameters is given, where the ground-state ...

[Phys. Rev. A 90, 053621] Published Tue Nov 18, 2014

]]>We propose and analyze a circuit that implements a nonlinear coupling between two superconducting microwave resonators. The resonators are coupled through a superconducting quantum interference device that terminates one of the resonators. This produces a nonlinear interaction of the standard optome...

[Phys. Rev. A 90, 053833] Published Tue Nov 18, 2014

]]>We introduce a theoretical framework which is suitable for the description of all spatial and time-multiplexed periodic single-photon sources realized or proposed thus far. Our model takes into account all possibly relevant loss mechanisms. This statistical analysis of the known schemes shows that m...

[Phys. Rev. A 90, 053834] Published Tue Nov 18, 2014

]]>We consider theoretically a closed (zero-dimensional) semiconductor microcavity where a confined vacuum photonic mode is coupled to electrons in the valence band of the semiconductor. It is shown that vacuum-induced virtual electron transitions between valence and conduction bands result in renormal...

[Phys. Rev. A 90, 055802] Published Tue Nov 18, 2014

]]>We report on parallel production of Bose-Einstein condensates (BECs) in steerable, multiplexed crossed optical dipole traps. Using a conventional trap-weakening evaporation scheme, where the optical trapping power is lowered, we obtain an array of up to four independent BECs. To improve evaporation ...

[Phys. Rev. A 90, 051401] Published Mon Nov 17, 2014

]]>The violation of the Cauchy-Schwarz and Bell inequalities ranks among the major evidence of the genuinely quantum nature of an emitter. The conventional theoretical approaches associate operators with spectral lines to study correlations between photons from real-state transitions. Instead, we use a...

[Phys. Rev. A 90, 052111] Published Mon Nov 17, 2014

]]>We suggest an all-optical quantum memory scheme which is based on the off-resonant Raman interaction of a signal quantum field and a strong control field in a three-level atomic medium in the case where the control field has a spatially varying frequency across the beam, called a spatial chirp. We s...

[Phys. Rev. A 90, 052322] Published Mon Nov 17, 2014

]]>Physical principles constrain the way nonlocal correlations can be distributed among distant parties. These constraints are usually expressed by monogamy relations that bound the amount of Bell inequality violation observed among a set of parties by the violation observed by a different set of parti...

[Phys. Rev. A 90, 052323] Published Mon Nov 17, 2014

]]>We consider the problem of time-optimal control of a continuous bosonic quantum system subject to the action of a Markovian dissipation. In particular, we consider the case of a one-mode Gaussian quantum system prepared in an arbitrary initial state and which relaxes to the steady state due to the a...

[Phys. Rev. A 90, 052324] Published Mon Nov 17, 2014

]]>We investigate the dispersive Casimir–Polder interaction between a rubidium atom and a suspended graphene sheet subjected to an external magnetic field B. We demonstrate that this concrete physical system allows for an unprecedented control of dispersive interactions at micro- and nanoscales. Indeed...

[Phys. Rev. A 90, 052511] Published Mon Nov 17, 2014

]]>We present here a model of the exchange-correlation hole for strongly correlated systems using a simple nonlocal generalization of the Wigner-Seitz radius. The model behaves similarly to the strictly correlated electron approach, which gives the infinitely correlated limit of density functional theo...

[Phys. Rev. A 90, 052512] Published Mon Nov 17, 2014

]]>Relativistic ab initio calculations have been performed to assess the suitability of RaF for experimental search of P- and T-and-P–violating interactions. The parameters of P- and T,P-odd terms of the spin-rotational Hamiltonian have been calculated for the 2Σ electronic ground state of the RaF223 m...

[Phys. Rev. A 90, 052513] Published Mon Nov 17, 2014

]]>We have measured the absolute double-differential cross sections (DDCS) for electron emission in ionization of He and Ne atoms under the impact of 6-MeV/u C6+ ions. Data were collected between 1 and 500 eV for He, while for Ne this range was extended up to 1000 eV. The angular ranges covered in the ...

[Phys. Rev. A 90, 052714] Published Mon Nov 17, 2014

]]>We study the formation of highly excited neutral atoms during the breakup of strongly driven molecules. Past work on this significant phenomenon has shown that during the formation of highly excited neutral atoms (H*) during the breakup of H2 in a linear laser field the electron that escapes does so...

[Phys. Rev. A 90, 053419] Published Mon Nov 17, 2014

]]>We present a systematic derivation of the effective action for interacting vortices in a nonrelativistic two-dimensional superfluid described by the Gross-Pitaevskii equation by integrating out longitudinal fluctuations of the order parameter. There are no logarithmically divergent coefficients in t...

[Phys. Rev. A 90, 053617] Published Mon Nov 17, 2014

]]>We study the dynamics in a one-dimensional hard-core Bose gas with power-law hopping after an abrupt reduction of the hopping range using the time-dependent density-matrix renormalization-group and bosonization techniques. In particular, we focus on the destruction of the Bose-Einstein condensate (B...

[Phys. Rev. A 90, 053618] Published Mon Nov 17, 2014

]]>We study the virial expansion for three-dimensional Bose and Fermi gases at finite temperature using an approximation that only considers two-body processes and is valid for high temperatures and low densities. The first virial coefficients are computed and the second is exact. The results are obtai...

[Phys. Rev. A 90, 053619] Published Mon Nov 17, 2014

]]>We investigate the BCS-BEC crossover in a bilayer system of fermionic dipoles at zero temperature using the fixed-node diffusion Monte Carlo technique. The dipoles are confined on two parallel planes separated by a distance λ and are aligned perpendicular to the planes by an external field. The inte...

[Phys. Rev. A 90, 053620] Published Mon Nov 17, 2014

]]>Linear optomechanical photon-phonon couplings in the membrane-in-the-middle setup can be enhanced by taking a multielement approach as it was recently shown [A. Xuereb, C. Genes, and A. Dantan, Phys. Rev. Lett. 109, 223601 (2012)PRLTAO10.1103/PhysRevLett.109.223601]. The particular example considere...

[Phys. Rev. A 90, 053831] Published Mon Nov 17, 2014

]]>Based on a single atom coupled to a fiber-coupled, chip-based microresonator [B. Dayan et al., Science 319, 1062 (2008)SCIEAS10.1126/science.1152261], we put forward a scheme to generate optical frequency combs at driving laser powers as low as a few nanowatts. Using state-of-the-art experimental pa...

[Phys. Rev. A 90, 053832] Published Mon Nov 17, 2014

]]>We propose a dissipative scheme to generate a maximally entangled state for two Λ-type atoms trapped in an optical cavity. Different from the unitary-dynamics-based scheme, our work shows that both atomic spontaneous emission and cavity decay are no longer detrimental, but necessary for entanglement...

[Phys. Rev. A 90, 054302] Published Mon Nov 17, 2014

]]>