We develop a microscopic theory of the dynamic structure factor to describe the Bogoliubov-Anderson-Goldstone phonon mode and its damping rate in a strongly interacting Fermi gas at finite temperature. It is based on a density functional approach—the so-called superfluid local density approximation....

[Phys. Rev. A 98, 011602(R)] Published Mon Jul 16, 2018

]]>We develop a theoretical description of non-Hermitian time evolution that accounts for the breakdown of the adiabatic theorem. We obtain closed-form expressions for the time-dependent state amplitudes, involving the complex eigenenergies as well as interband Berry connections calculated using basis ...

[Phys. Rev. A 98, 012119] Published Mon Jul 16, 2018

]]>Autonomous quantum error correction utilizes the engineered coupling of a quantum system to a dissipative ancilla to protect quantum logical states from decoherence. We show that the Knill-Laflamme condition, stating that the environmental error operators should act trivially on a subspace, which th...

[Phys. Rev. A 98, 012317] Published Mon Jul 16, 2018

]]>Spectral lines of radiating atoms are broadened by perturbations due to the surrounding plasma environment. In line-broadening calculations, the statistical average of the perturbation is weighted by the density matrix, which, in thermal equilibrium, contains correlations between the radiator and pl...

[Phys. Rev. A 98, 012505] Published Mon Jul 16, 2018

]]>Hybrid systems of ultracold atoms and trapped ions or Rydberg atoms can be useful for quantum simulation purposes. By tuning the geometric arrangement of the impurities, it is possible to mimic solid-state and molecular systems. Here, we study a single trapped atom interacting with a set of arbitrar...

[Phys. Rev. A 98, 012708] Published Mon Jul 16, 2018

]]>We have performed ultrafast three-dimensional ion momentum imaging spectroscopy on the dissociative single ionization of oxygen molecules using attosecond pulse trains with a broad energy spectrum of 5–30 eV. High-resolution momentum imaging allows clear identification of vibrational structures corr...

[Phys. Rev. A 98, 013410] Published Mon Jul 16, 2018

]]>We investigate tunneling ionization of a model helium atom in a strong circularly polarized short laser pulse using the classical backpropagation method and compare ten different tunneling criteria on the same footing, aiming for a consistent classical picture of the tunneling dynamics. These tunnel...

[Phys. Rev. A 98, 013411] Published Mon Jul 16, 2018

]]>We investigate the time evolution of density, spin, and pairing correlation functions in one-dimensional $t\text{\u2212}J$ models following a quantum quench using the time-dependent density matrix renormalization group. While density and spin correlation functions show the typical light-cone behavior over a wide ...

[Phys. Rev. A 98, 013616] Published Mon Jul 16, 2018

]]>We analyze the photon correlations in an optomechanical system containing two nonlinear optical modes and one mechanical mode which are coupled via a three-mode mixing. Under a weak driving condition, we determine the optimal conditions for photon antibunching in the weak-Kerr-nonlinear regime and f...

[Phys. Rev. A 98, 013826] Published Mon Jul 16, 2018

]]>We study solitons of the two-dimensional nonlinear Dirac equation with asymmetric cubic nonlinearity. We show that with the nonlinearity parameters specifically tuned, a high degree of localization of both spinor components is enabled on a ring of certain radius. Such ring Dirac soliton can be viewe...

[Phys. Rev. A 98, 013827] Published Mon Jul 16, 2018

]]>We demonstrate an unseeded multimode four-wave-mixing process in hot ${}^{85}\mathrm{Rb}$ vapor using two pump beams of the same frequency that cross at a small angle. This results in the simultaneous fulfillment of multiple phase-matching conditions that reinforce one another to produce four intensity-stabilized b...

[Phys. Rev. A 98, 013828] Published Mon Jul 16, 2018

]]>Trapped ions offer an excellent platform to investigate fascinating phenomena in quantum physics. Here we propose an experimental scheme to achieve Anderson localization of phonons using an ion chain under irradiation of a laser Bessel beam. The quasiperiodicity comes from the characteristic of the ...

[Phys. Rev. A 98, 013829] Published Mon Jul 16, 2018

]]>The question concerning the physical realizability of a probability distribution is quite important in quantum foundations. Recent studies emphasized a principle which was first indicated by Specker. This principle, called Specker's principle, bounds physically realizable correlations. We study Spec...

[Phys. Rev. A 98, 012116] Published Fri Jul 13, 2018

]]>Quantum measurement can be strong or weak, the former being important in readout and initialization of quantum objects and the latter being useful for monitoring and maneuvering quantum evolution. However, the boundary between weak and strong measurement is unclear. Here we show that a phase transit...

[Phys. Rev. A 98, 012117] Published Fri Jul 13, 2018

]]>It has been said about quantum interference, that “*in reality, it contains the only mystery*”. Together with nonlocality, it is often considered the characteristic feature of quantum theory challenging our classical understanding of the world. In this work, we are concerned with the restricted settin...

[Phys. Rev. A 98, 012118] Published Fri Jul 13, 2018

]]>Unextendible product bases (UPBs) are interesting mathematical objects arising in composite Hilbert spaces that have found various applications in quantum information theory, for instance in a construction of bound entangled states or Bell inequalities without quantum violation. They are closely rel...

[Phys. Rev. A 98, 012313] Published Fri Jul 13, 2018

]]>Measurement-device-independent quantum key distribution protocol, whose security analysis does not rely on any assumption on the detection system, can immune the attacking against detectors. We give a first composable security analysis for continuous-variable measurement-device-independent quantum k...

[Phys. Rev. A 98, 012314] Published Fri Jul 13, 2018

]]>The problem of determining whether a given quantum state is entangled lies at the heart of quantum information processing. Despite the many methods—such as the positive partial transpose criterion and the $k$-symmetric extendibility criterion—to tackle this problem, none of them enables a general, pra...

[Phys. Rev. A 98, 012315] Published Fri Jul 13, 2018

]]>This paper investigates the capacity of a continuously distributed quantum network. A mathematical model of a multihop quantum communication process is given for capacity analysis. Our model assumes $n$ nodes in a unit square, and both a capacity upper bound for arbitrarily distributed quantum network...

[Phys. Rev. A 98, 012316] Published Fri Jul 13, 2018

]]>The multiconfiguration Dirac–Hartree–Fock theory is used to calculate the $3d{}^{9}\phantom{\rule{0.28em}{0ex}}{}^{2}D_{3/2}\to {}^{2}{D}_{5/2}$ transition energy for Co-like ions with $Z=28\u2013100$. We investigate how electron correlation, frequency-independent and -dependent Breit interactions, as well as QED corrections vary along the sequence. The well-un...

[Phys. Rev. A 98, 012504] Published Fri Jul 13, 2018

]]>We present *ab initio* calculations of the electronic differential energy-transfer cross sections for antiprotons with energies between 3 keV and 1 MeV interacting with helium. By comparison with simulations employing the mean-field description based on the single-active electron approximation we are ...

[Phys. Rev. A 98, 012707] Published Fri Jul 13, 2018

]]>Periodic driving of a quantum system can significantly alter its energy bands and even change the band topology, opening a completely new avenue for engineering novel quantum matter. Although important progress has been made recently in measuring topological properties of Floquet bands in different ...

[Phys. Rev. A 98, 013615] Published Fri Jul 13, 2018

]]>Excitation and propagation of the surface polaritonic rogue waves and breathers are investigated by proposing a coupler free optical waveguide that consists of a transparent layer, middle negative index metamaterial layer, and bottom layer of the cold four level atomic medium. In this planar optical...

[Phys. Rev. A 98, 013825] Published Fri Jul 13, 2018

]]>When quantum information is spread over a system through nonclassical correlation, it makes retrieving information by local measurements difficult—making global measurement necessary for optimal parameter estimation. In this paper, we consider temperature estimation of a system in a Gibbs state and ...

[Phys. Rev. A 98, 012115] Published Thu Jul 12, 2018

]]>The monogamy relation for quantum correlations is not satisfied by all measures for all multiparty quantum states. We prove that an arbitrary quantum state which is nonmonogamous for negativity will become monogamous if a finite number of copies of the same state is provided. We refer to this as act...

[Phys. Rev. A 98, 012310] Published Thu Jul 12, 2018

]]>In this paper, we report efficient quantum circuits for integer multiplication using the Toom-Cook algorithm. By analyzing the recursive tree structure of the algorithm, we obtained a bound on the count of Toffoli gates and qubits. These bounds are further improved by employing reversible pebble gam...

[Phys. Rev. A 98, 012311] Published Thu Jul 12, 2018

]]>We propose an efficient strategy to attack a continuous-variable (CV) quantum key distribution (QKD) system, which we call homodyne detector blinding. This attack strategy takes advantage of a generic vulnerability of homodyne receivers: A bright light pulse sent on the signal port can lead to a sat...

[Phys. Rev. A 98, 012312] Published Thu Jul 12, 2018

]]>We show that multichannel interactions significantly alter the phase diagram of ultracold bosonic molecules in an optical lattice. Most prominently, an unusual fluid region intervenes between the conventional superfluid and the Mott insulator. In it, number fluctuations remain but phase coherence is...

[Phys. Rev. A 98, 013611] Published Thu Jul 12, 2018

]]>A method for the creation of three-dimensional (3D) solitary topological modes, corresponding to vortical droplets of a two-component dilute superfluid, is presented. We use the recently introduced system of nonlinearly coupled Gross-Pitaevskii equations, which include contact attraction between the...

[Phys. Rev. A 98, 013612] Published Thu Jul 12, 2018

]]>Time crystals are quantum many-body systems which are able to self-organize their motion in a periodic way in time. Discrete time crystals have been experimentally demonstrated in spin systems. However, the first idea of spontaneous breaking of discrete time translation symmetry, in ultracold atoms ...

[Phys. Rev. A 98, 013613] Published Thu Jul 12, 2018

]]>We theoretically investigate a three-dimensional weakly interacting Bose gas with one-dimensional Raman-type spin-orbit coupling at zero temperature. By employing an improved ansatz, including high-order harmonics in the stripe phase, we show that the critical transition from the stripe to the plane...

[Phys. Rev. A 98, 013614] Published Thu Jul 12, 2018

]]>We study photon, phonon statistics, and the cross-correlation between photons and phonons in a quadratically coupled optomechanical system. Photon blockade, phonon blockade, and strong anticorrelation between photons and phonons can be observed in the same parameter regime with the effective nonline...

[Phys. Rev. A 98, 013821] Published Thu Jul 12, 2018

]]>We propose a feasible invisibility approach to suppress the scattering of waves from or to given directions and for particular frequencies, i.e., invisibility on demand. We derive a generalized Hilbert transform for a specific invisibility arrangement relating the two quadratures of the complex perm...

[Phys. Rev. A 98, 013822] Published Thu Jul 12, 2018

]]>We have derived and investigated analytical expressions for the spontaneous emission radiative decay rate of an optically active (chiral) molecule placed near a chiral (bi-isotropic) triaxial nanoellipsoid, the size of which is much smaller than the wavelength. Differences in radiative decay rates o...

[Phys. Rev. A 98, 013823] Published Thu Jul 12, 2018

]]>In this paper we theoretically show that counterpart photonic Cooper pairs can be achieved in nanoscale waveguides with radiation pressure effect. We demonstrate that due to Brillouin scattering a Stokes photon and an anti-Stokes one can exchange virtual phonons, leading to an effective photon-photo...

[Phys. Rev. A 98, 013824] Published Thu Jul 12, 2018

]]>While Bohr's complementarity principle constitutes a bedrock of quantum mechanics with profound implications, coherence, as a defining feature of the quantum realm originating from the superposition principle, pervades almost every quantum consideration. By exploiting the algebraic and geometric str...

[Phys. Rev. A 98, 012113] Published Wed Jul 11, 2018

]]>We investigate the ultimate precision achievable in Gaussian quantum metrology. We derive general analytical expressions for the quantum Fisher information matrix and for the measurement compatibility condition, ensuring asymptotic saturability of the quantum Cramér-Rao bound, for the estimation of ...

[Phys. Rev. A 98, 012114] Published Wed Jul 11, 2018

]]>Extensive calculations are reported for electron collision strengths, rate coefficients, and transitions probabilities for a wide range of transitions in Fe ii. The collision strengths were calculated in the close-coupling approximation using the *B*-spline Breit-Pauli *R*-matrix method. The multiconfig...

[Phys. Rev. A 98, 012706] Published Wed Jul 11, 2018

]]>A double-electron-ionization process occurs when an intense laser pulse interacts with atoms or molecules. Exact *ab initio* numerical simulation of such a situation is extremely computer resource demanding, thus often one is forced to apply reduced dimensionality models to get insight into the physic...

[Phys. Rev. A 98, 013405] Published Wed Jul 11, 2018

]]>Derivations for the higher tensor components of the quadrupole polarizabilities are given and their values for the metastable states of the ${\mathrm{Ca}}^{+}$, ${\mathrm{Sr}}^{+}$, and ${\mathrm{Ba}}^{+}$ alkaline-earth-metal ions are estimated. We also give the scalar quadrupole polarizabilities of the ground and metastable states of these ions...

[Phys. Rev. A 98, 013406] Published Wed Jul 11, 2018

]]>We investigate higher-order nonlinear inelastic scattering of electrons at an optical standing wave formed by two light waves with the same frequencies in vacuum. Initial conditions necessary for efficient scattering are obtained from the semiclassical energy and momentum conservation laws for all n...

[Phys. Rev. A 98, 013407] Published Wed Jul 11, 2018

]]>Frontiers of attosecond science are constantly shifting, thus addressing more and more intricate effects with increasing resolution. Ultrashort pulses offer a practical way to prepare complex superpositions of quantum states, follow, and steer their dynamics. In this contribution, an ultrafast spin-...

[Phys. Rev. A 98, 013408] Published Wed Jul 11, 2018

]]>We measure the laser-intensity-dependent photoelectron momentum and energy spectra and identify the emerged resonant $(4s,3d$, and $4f)$ states of multiphoton ionization of Ne at 400 nm. We employ parallelly polarized two-color fields involving a strong ionizing 400-nm field and a weak 800-nm field to p...

[Phys. Rev. A 98, 013409] Published Wed Jul 11, 2018

]]>We consider general three-mode interferometers using a spin-1 atomic Bose-Einstein condensate with macroscopic magnetization. We show that these interferometers, combined with the measurement of the number of particles in each output port, provide an ultrahigh phase sensitivity. We construct effecti...

[Phys. Rev. A 98, 013610] Published Wed Jul 11, 2018

]]>We present the general analytical theory for Dyakonov surface waves at the interface of a biaxial anisotropic dielectric with an isotropic medium. We demonstrate that these surface waves can be divided into two distinct classes, with qualitatively different spatial behavior. We obtain explicit expre...

[Phys. Rev. A 98, 013818] Published Wed Jul 11, 2018

]]>We investigate time-dependent spectra of the intermittent resonance fluorescence of a single, laser-driven, three-level atom due to electron shelving. After a quasistationary state of the strong transition, a slow decay due to shelving leads to the steady state of the three-level system. The long-te...

[Phys. Rev. A 98, 013820] Published Wed Jul 11, 2018

]]>Large dynamical fluctuations—atypical realizations of the dynamics sustained over long periods of time—can play a fundamental role in determining the properties of collective behavior of both classical and quantum nonequilibrium systems. Rare dynamical fluctuations, however, occur with a probability...

[Phys. Rev. A 98, 010103(R)] Published Tue Jul 10, 2018

]]>Generation and manipulation of the quantum state of a single photon is at the heart of many quantum information protocols. There has been growing interest in using phase modulators as quantum optics devices that preserve coherence. In this Rapid Communication, we have used an electro-optic phase mod...

[Phys. Rev. A 98, 011802(R)] Published Tue Jul 10, 2018

]]>We study the tomography of propagators for spin systems in the context of finite-dimensional Wigner representations, which completely characterize and visualize operators using shapes assembled from linear combinations of spherical harmonics. The Wigner representation of a propagator can be experime...

[Phys. Rev. A 98, 012112] Published Tue Jul 10, 2018

]]>A singular-value thresholding (SVT) operation is a fundamental core module of many mathematical models in computer vision and machine learning, particularly for many nuclear norm minimizing-based problems. A quantum SVT (QSVT) algorithm was proposed in Phys. Rev. A. **96**, 032301 (2017) to solve an ima...

[Phys. Rev. A 98, 012308] Published Tue Jul 10, 2018

]]>We extend the concept of Anderson localization, the confinement of quantum information in a spatially irregular potential, to quantum circuits. Considering matchgate circuits, generated by time-dependent spin-$\frac{1}{2}$ $XY$ Hamiltonians, we give an analytic formula for the out-of-time-ordered correlator of a...

[Phys. Rev. A 98, 012309] Published Tue Jul 10, 2018

]]>We report on the radiative decay of double $K$-shell vacancy states produced in solid Ca, V, Fe, and Cu targets by impact with about 10 MeV/amu C and Ne ions. The resulting $K$ hypersatellite x-ray emission spectra were measured by means of high-energy-resolution spectroscopy using a von Hamos bent crys...

[Phys. Rev. A 98, 012705] Published Tue Jul 10, 2018

]]>Static, dynamic, and topological properties of hollow systems differ from those that are fully filled as a result of the presence of a boundary associated with an inner surface. Hollow Bose-Einstein condensates (BECs) naturally occur in various ultracold atomic systems and possibly within neutron st...

[Phys. Rev. A 98, 013609] Published Tue Jul 10, 2018

]]>Passive optical interferometry with single photons injected into some input ports and vacuum into others is enriched by admitting polarization, thereby replacing the scalar electromagnetic description by a vector theory, with the recent triad phase being a celebrated example of this richness. On the...

[Phys. Rev. A 98, 013817] Published Tue Jul 10, 2018

]]>The hierarchical equations of motion (HEOM) for a generalized quantum dissipative system is rigorously constructed in the frameworks of two different stochastic dynamical descriptions, i.e., the non-Markovian quantum state diffusion approach as well as the stochastic decoupling scheme. We demonstrat...

[Phys. Rev. A 98, 012110] Published Mon Jul 09, 2018

]]>We introduce a one-dimensional non-Hermitian four-band tight-binding lattice system. We find stable topological edge states protected by particle-hole and parity-time symmetries. We show that a topological phase appears in the system. We discuss that the system can also be used as a topological lase...

[Phys. Rev. A 98, 012111] Published Mon Jul 09, 2018

]]>We present a scheme for teleporting a quantum state between two parties whose local reference frames are misaligned by the action of a finite symmetry group. Unlike other proposals, our scheme requires the same amount of classical communication and entangled resources as conventional teleportation, ...

[Phys. Rev. A 98, 012306] Published Mon Jul 09, 2018

]]>We generalize the definition of strong positive partial transpose (SPPT) to the multipartite system. The tripartite case was first considered by Yu and Zhao [Int. J. Theor. Phys. **54**, 292 (2014)]. In this extension, unfortunately, desired properties such as the PPT of SPPT states and the separability...

[Phys. Rev. A 98, 012307] Published Mon Jul 09, 2018

]]>We study process of dielectronic recombination with He-like uranium initially being in one of the metastable states $[{\left(1s2s\right)}_{0}$ and ${\left(1s2{p}_{1/2}\right)}_{0}]$. We consider resonant regions of the incident electron energy corresponding to participation of triply excited states of Li-like uranium. The total and differe...

[Phys. Rev. A 98, 012503] Published Mon Jul 09, 2018

]]>We introduce a description of Ramsey spectra under atomic interactions as a sum of decomposed components with differing dependence on interaction parameters. This description enables intuitive understanding of the loss of contrast and asymmetry of Ramsey spectra. We derive a quantitative relationshi...

[Phys. Rev. A 98, 012704] Published Mon Jul 09, 2018

]]>We experimentally and numerically investigate thermalization processes of a trapped ${}^{87}\mathrm{Rb}$ Bose gas, initially prepared in a nonequilibrium state through partial Bragg diffraction of a Bose-Einstein condensate (BEC). The system evolves in a Gaussian potential, where we observe the destruction of the B...

[Phys. Rev. A 98, 013606] Published Mon Jul 09, 2018

]]>A generalized Mermin-Ho relation for a spin-1 Bose-Einstein condensate is derived, which is applicable to vortices regardless of the symmetry and spin polarization of the order parameter. The obtained relation implies an su(3) mass-current circulation and two classes of vortices corresponding to two...

[Phys. Rev. A 98, 013607] Published Mon Jul 09, 2018

]]>Experimental advances in synthesizing spin-orbit couplings in cold atomic Bose gases promise to create single-particle dispersion laws featuring energy minima that are degenerate on a ring or a sphere in momentum space. We show that for arbitrary space dimensionality the ground-state properties of a...

[Phys. Rev. A 98, 013608] Published Mon Jul 09, 2018

]]>We analyze a single-atom cavity QED model to isolate the dynamic mechanism of stochastic switching between regions of state space associated with mean-field attractors of absorptive bistability. We present evidence from simulations that such switching is correlated with variations in the timings of ...

[Phys. Rev. A 98, 013812] Published Mon Jul 09, 2018

]]>Optical nonlinearities at the single-photon level are key features to build efficient photon-photon gates and to implement quantum networks. Such optical nonlinearities can be obtained using an ideal two-level system such as a single atom coupled to an optical cavity. While efficient, such atom-phot...

[Phys. Rev. A 98, 013813] Published Mon Jul 09, 2018

]]>We extend the usual multipolar theory of linear Rayleigh and Raman scattering to include the second-order correction. These terms promise a wealth of information about the shape of a scatterer and yet are insensitive to the scatterer's chirality. Our extended theory might prove especially useful for...

[Phys. Rev. A 98, 013814] Published Mon Jul 09, 2018

]]>We discuss the Bloch-Messiah decomposition for the broadband squeezed light generated by type-I parametric down-conversion with a monochromatic pump. Using an exact solution for this process, we evaluate the squeezing parameters and the corresponding squeezing eigenmodes. Next we consider the Magnus...

[Phys. Rev. A 98, 013815] Published Mon Jul 09, 2018

]]>We study the temporal dynamics of photoexcited carriers in distributed Bragg reflector based semiconductor micropillars at room temperature. Their influence on the process of coherent phonon generation and detection is analyzed by means of pump-probe microscopy. The dependence of the measured mechan...

[Phys. Rev. A 98, 013816] Published Mon Jul 09, 2018

]]>We discuss a general method of model selection from experimentally recorded time-trace data. This method can be used to distinguish between quantum and classical dynamical models. It can be used in postselection as well as for real-time analysis, and offers an alternative to statistical tests based ...

[Phys. Rev. A 98, 010102(R)] Published Fri Jul 06, 2018

]]>We report on a method to generate extreme ultraviolet vortices from high-order harmonic generation with two-color counter-rotating Laguerre-Gaussian ($\text{LG}$) beams that carry a well-defined orbital angular momentum (OAM). Our calculations show that the OAM of each harmonic can be directly controlled by ...

[Phys. Rev. A 98, 011401(R)] Published Fri Jul 06, 2018

]]>We rigorously investigate the quantum non-Markovian dissipative dynamics of a system coupled to a harmonic-oscillator bath by deriving hierarchical Schrödinger equations of motion (HSEOM) and studying their dynamics. The HSEOM are the equations for wave functions derived on the basis of the Feynman-...

[Phys. Rev. A 98, 012109] Published Fri Jul 06, 2018

]]>We numerically explore molecular orientation dynamics with moderately intense nanosecond two-color laser pulses. It is believed that the nanosecond two-color pulse can adiabatically control the molecular orientation. However, in our simulation based on the time-dependent Schrödinger equation, which ...

[Phys. Rev. A 98, 013404] Published Fri Jul 06, 2018

]]>We study the anisotropic, elliptic expansion of a thermal atomic Bose gas released from an anisotropic trapping potential, for a wide range of interaction strengths across a Feshbach resonance. We show that this hydrodynamic phenomenon is for all interaction strengths fully described by a microscopi...

[Phys. Rev. A 98, 011601(R)] Published Thu Jul 05, 2018

]]>An essential ingredient in many examples of the conflict between quantum theory and noncontextual hidden variables (e.g., the proof of the Kochen-Specker theorem and Hardy's proof of Bell's theorem) is a set of atomic propositions about the outcomes of ideal measurements such that, when outcome nonc...

[Phys. Rev. A 98, 012106] Published Thu Jul 05, 2018

]]>While entanglement plays an important role in characterizing quantum many-body systems, it is hardly possible to directly access many-body entanglement in real experiments. In this paper, we study how bipartite entanglement of many-body states is manifested in the correlation of local measurement ou...

[Phys. Rev. A 98, 012107] Published Thu Jul 05, 2018

]]>The dynamics of an open quantum system can be fully described and tomographically reconstructed if the experimenter has complete control over the system of interest. Most real-world experiments do not fulfill this assumption, and the amount of control is restricted by the respective experimental set...

[Phys. Rev. A 98, 012108] Published Thu Jul 05, 2018

]]>We propose a protocol for state transfer and entanglement generation between two distant spin qubits (sender and receiver) that have different energies. The two qubits are permanently coupled to a far-off-resonant spin chain, and the qubit of the sender is driven by an external field, which provides...

[Phys. Rev. A 98, 012304] Published Thu Jul 05, 2018

]]>Quantum mechanics puts a restriction on the number of observers who can simultaneously steer another observer's system, known as the monogamy of steering. In this work, we find the limit of the number of observers (Bobs) who can steer another party's (Alice's) system, invoking a scenario where half ...

[Phys. Rev. A 98, 012305] Published Thu Jul 05, 2018

]]>A joint experimental and theoretical investigation of the valence-shell excitations of hydrogen deuteride has been performed by the fast electron impact method at an incident electron energy of 1500 eV and the multireference single- and double-excitation configuration-interaction method. Momentum-tr...

[Phys. Rev. A 98, 012502] Published Thu Jul 05, 2018

]]>Ion-beam cancer therapy has become increasingly favored worldwide in treatment of certain types of cancer over the last decade. Whereas the clinical effects of the therapy are well documented, the understanding of the underlying physical mechanisms is somewhat incomplete. The problem arises due to t...

[Phys. Rev. A 98, 012702] Published Thu Jul 05, 2018

]]>Fully differential cross sections for electron impact of gaseous ${\mathrm{H}}_{2}\mathrm{O}$ at an impact energy of 81 eV are calculated within the framework of the continuum-distorted-wave eikonal-initial-state model. Present results are benchmarked against recent experimental data obtained in MPIK-Heidelberg by means of ...

[Phys. Rev. A 98, 012703] Published Thu Jul 05, 2018

]]>We analyze the energy spectrum and eigenstates of cold atoms in a tilted brick-wall optical lattice. When the tilt is applied, the system exhibits a sequence of topological phase transitions reflected in an abrupt change of the eigenstates. It is demonstrated that these topological phase transitions...

[Phys. Rev. A 98, 013603] Published Thu Jul 05, 2018

]]>Rapidly scanning magnetic and optical dipole traps have been widely utilized to form time-averaged potentials for ultracold quantum gas experiments. Here we theoretically and experimentally characterize the dynamic properties of Bose-Einstein condensates in ring-shaped potentials that are formed by ...

[Phys. Rev. A 98, 013604] Published Thu Jul 05, 2018

]]>We study the physics of $\nu =1/2$ bosonic fractional quantum Hall droplets confined in a ring-shaped region delimited by two concentric cylindrically symmetric hard-wall potentials. Trial wave functions based on an extension of the Jack polynomial formalism including two different chiral edges are propo...

[Phys. Rev. A 98, 013605] Published Thu Jul 05, 2018

]]>We propose a scheme that can generate a microwave-controlled optical double optomechanical induced transparency (OMIT) in a hybrid piezo-optomechanical cavity system in which a piezoelectric optomechanical crystal AlN-nanobeam resonator is placed in a superconducting coplanar microwave cavity. We sh...

[Phys. Rev. A 98, 013807] Published Thu Jul 05, 2018

]]>We consider the ${F}_{g}=1\to {F}_{e}=1$ transition between the ground and excited hyperfine levels in alkali-metal vapor interacting with $\sigma $ linearly polarized control and probe fields whose polarizations can be either parallel or perpendicular to each other. We develop a matrix formulation that allows a solution ...

[Phys. Rev. A 98, 013808] Published Thu Jul 05, 2018

]]>A description of the photon statistics of photon-added and photon-subtracted states is presented. It is found that photon subtraction may increase the mean photon number or leave it unchanged, whereas photon addition may increase the mean photon number by more than the number of photons added.

[Phys. Rev. A 98, 013809] Published Thu Jul 05, 2018

]]>The achievement of Bose-Einstein condensation of photons (phBEC) in a dye-filled microcavity has led to a renewed interest in the density distribution of the ideal Bose gas in a two-dimensional harmonic oscillator. We present measurements of the radial profile of photons inside the microcavity below...

[Phys. Rev. A 98, 013810] Published Thu Jul 05, 2018

]]>Single-photon detectors are widely used in modern quantum optics experiments and applications. Like all detectors, it is important for these devices to be accurately calibrated. A single-photon detector is calibrated by determining its detection efficiency; the common method to measure this quantity...

[Phys. Rev. A 98, 013811] Published Thu Jul 05, 2018

]]>[Phys. Rev. A 98, 019901] Published Thu Jul 05, 2018

]]>[Phys. Rev. A 98, 019902] Published Thu Jul 05, 2018

]]>We construct optimal measurements, achieving the ultimate precision predicted by quantum theory, for the simultaneous estimation of centroid, separation, and relative intensities of two incoherent point sources using a linear optical system. We discuss the physical feasibility of the scheme, which c...

[Phys. Rev. A 98, 012103] Published Tue Jul 03, 2018

]]>Understanding out-of-equilibrium quantum dynamics is a critical outstanding problem, with key questions regarding characterizing adiabaticity for applications in quantum technologies. We show how the metric-space approach to quantum mechanics naturally characterizes regimes of quantum dynamics and p...

[Phys. Rev. A 98, 012104] Published Tue Jul 03, 2018

]]>Quantum cellular automata are important tools in understanding quantum dynamics, thanks to their simple and effective list of rules. Here we consider a class of noisy, one-dimensional quantum cellular automata that allow one to shift from unitary dynamics to completely positive maps, investigating t...

[Phys. Rev. A 98, 012105] Published Tue Jul 03, 2018

]]>We provide an analysis on the critical property of quantum coherence in *XY* spin systems based on the quantum renormalization group theory. We find that the quantum coherence obeys a conservation relation, i.e., the quantum coherence of a three-block state that is the sum of its reduced state coheren...

[Phys. Rev. A 98, 012303] Published Tue Jul 03, 2018

]]>We present a technique for the synthesis of ultrashort laser pulses with approximately one cycle (FWHM) of temporal duration. These pulses are characterized by a certain degree of chirp. We show that these pulses produce both an enhancement of the high-order harmonic generation (HHG) cutoff and a no...

[Phys. Rev. A 98, 013403] Published Tue Jul 03, 2018

]]>We theoretically investigate the high-precision estimation of the coupling rate, which can reflect an actual observable, in a hybrid optomechanical system (OMS). In our scheme, apart from an optical cavity, the mechanical vibrator is also coupled to a two-level system (TLS) via a direct dispersive c...

[Phys. Rev. A 98, 013803] Published Tue Jul 03, 2018

]]>We demonstrate 8.5 dB thermal squeezing of a membrane oscillator using the dynamical backaction effect and electrostatic feedback in an optomechanical membrane-in-the-middle setup. We show that strong squeezing can be obtained even in the far-detuning regime of a sideband-resolved system. By using t...

[Phys. Rev. A 98, 013804] Published Tue Jul 03, 2018

]]>We formulate a multiple scattering theory of light in media spatially disordered along two directions and homogeneous along the third one without making any paraxial approximation on the wave equation and fully treating the vector character of light. With this formalism, we calculate the distributio...

[Phys. Rev. A 98, 013805] Published Tue Jul 03, 2018

]]>In this paper, we investigate the impact of the electromagnetic scattering caused by other objects in nonfree space on the time-averaged force exerted upon a Rayleigh particle, which is conventionally referred to as the backaction effect. We show that backaction modifies the gradient force, radiatio...

[Phys. Rev. A 98, 013806] Published Tue Jul 03, 2018

]]>