It is shown that a class of exponentially decaying time-of-arrival probability distributions, suggested by Włodarz [Phys. Rev. A **65**, 044103 (2002)], Marchewka and Schuss [Phys. Lett. A **240**, 177 (1998), Phys. Rev. A **63**, 032108 (2001); Phys. Rev. A **65**, 042112 (2002)], and Jurman and Nikolić [Phys. Let...

[Phys. Rev. A 104, 042214] Published Mon Oct 18, 2021

]]>Regarded as one of the most fundamental concepts of classical mechanics and thermodynamics, work has received well-grounded definitions within the quantum framework since the 1970s, having being successfully applied to many contexts. Recent developments in the concept have taken place in the emergen...

[Phys. Rev. A 104, 042215] Published Mon Oct 18, 2021

]]>We theoretically investigate how entangled atomic states generated via spin-changing collisions in a spinor Bose-Einstein condensate can be designed and controllably prepared for atom interferometry that is robust against common technical issues, such as limited detector resolution. We use analytic ...

[Phys. Rev. A 104, 042415] Published Mon Oct 18, 2021

]]>The authors developed a highly sensitive method based on a quantum-control double-resonance-spectroscopy scheme to study electronically excited states of molecular ions that do not dissociate. The method is used to study the $3d\phantom{\rule{0}{0ex}}\delta $ Rydberg state of MgAr${}^{+}$, and the results contribute to the first extensive characterization of the Rydberg states of a molecular cation.

[Phys. Rev. A 104, 042811] Published Mon Oct 18, 2021

]]>We introduce a protocol for a quantum switch in the gravitational field of a spherical mass and determine the time interval required for its realization in the gravity of Earth. One of the agents that performs operations with indefinite order is a quantum system in a path-superposition state. Entang...

[Phys. Rev. A 104, 042414] Published Fri Oct 15, 2021

]]>We scattered 0.45–5 keV ${\mathrm{Ne}}^{+}$ ions at Al surfaces, performing angle resolved measurements of electron spectra from autoionizing decay of excitations in the scattered projectiles, produced by electron promotion in close atomic encounters with target atoms. The shift and the broadening of the autoioniza...

[Phys. Rev. A 104, 042810] Published Fri Oct 15, 2021

]]>We have created quantum degenerate Fermi gases of ${}^{6}\mathrm{Li}$ atoms at unprecedented high densities exceeding $1/{\lambda \phantom{\rule{-0.5em}{0ex}}-}^{3}$ (where $\lambda $ is the wavelength of resonant light). In this regime, new optical properties are predicted. Spin-polarized Fermi gases are usually regarded as noninteracting due to the weakness of $p$-...

[Phys. Rev. A 104, 043311] Published Fri Oct 15, 2021

]]>The forces acting on an isotropic microsphere in optical tweezers are effectively conservative. However, reductions in the symmetry of the particle or trapping field can break this condition. Here we theoretically analyze the motion of a particle in a linearly nonconservative optical vacuum trap, co...

[Phys. Rev. A 104, 043518] Published Fri Oct 15, 2021

]]>We characterize the optical response of a three-level atom subjected to an incoherent pump and continuously illuminated with a weak quasiresonant probe field. To this end, we apply a wave-function approach based on QED Hamiltonian perturbation theory which allows for a reduction of the atomic dynami...

[Phys. Rev. A 104, 043704] Published Fri Oct 15, 2021

]]>We present an experimental study demonstrating the manipulation of atom-number distributions of spinor gases after nonequilibrium quantum quenches across superfluid to Mott-insulator phase transitions in cubic optical lattices. Our data indicate that atom distributions in individual Mott lobes can b...

[Phys. Rev. A 104, L041304] Published Fri Oct 15, 2021

]]>Measurement incompatibility is a distinguishing property of quantum physics and an essential resource for many quantum information processing tasks. We introduce an approach to verify the joint measurability of measurements based on phase-space quasiprobability distributions. Our results, therefore,...

[Phys. Rev. A 104, 042212] Published Thu Oct 14, 2021

]]>We introduce the Poisson bracket operator, which is an alternative quantum counterpart of the Poisson bracket. This operator is defined using the operator derivative formulated in quantum analysis and is equivalent to the Poisson bracket in the classical limit. Using this, we derive the quantum cano...

[Phys. Rev. A 104, 042213] Published Thu Oct 14, 2021

]]>Echoing classical physics, quantum electrodynamics predicts the release of a spectral continuum of electromagnetic radiation upon the sudden acceleration of charged particles in quantum matter. Despite apparent theoretical success in describing sister nuclear processes, known as internal bremsstrahl...

[Phys. Rev. A 104, 042809] Published Thu Oct 14, 2021

]]>We demonstrate that two-time correlation functions, which are generalizations of out-of-time-ordered correlators (OTOCs), can show “false flags” of chaos by exhibiting behavior predicted by random matrix theory even in a system with classically regular dynamics. In particular, we analyze a system of...

[Phys. Rev. A 104, 043308] Published Thu Oct 14, 2021

]]>We consider a fixed impurity immersed in a Fermi gas at arbitrary temperature. We take the impurity to have two internal spin states where the $\uparrow $ state is assumed to interact with the medium such that it exhibits the orthogonality catastrophe, whereas the $\downarrow $ state is a bare noninteracting particle. In...

[Phys. Rev. A 104, 043309] Published Thu Oct 14, 2021

]]>Motivated by recent experiments, we study theoretically a gas of atomic bosons confined in an elliptical harmonic trap, forming a quasi-two-dimensional atomic Bose-Einstein condensate subject to a density-dependent gauge potential which realizes an effective density-angular-momentum coupling. We pre...

[Phys. Rev. A 104, 043310] Published Thu Oct 14, 2021

]]>A detailed analysis of the stimulated parametric down-conversion (PDC) process is performed to investigate the effects of the spatiotemporal degrees of freedom. The analysis provides information that would be useful for PDC-based metrology applications. Using a Wigner functional approach, we obtain ...

[Phys. Rev. A 104, 043514] Published Thu Oct 14, 2021

]]>Interference of scattered waves is fundamental for modern light-scattering techniques, such as optical wavefront shaping. Recently, a new type of wavefront shaping was introduced where the extinction is manipulated instead of the scattered intensity. The underlying idea is that upon changing the pha...

[Phys. Rev. A 104, 043515] Published Thu Oct 14, 2021

]]>We present a theoretical study of a Berezinskii-Kosterlitz-Thouless-like phase transition in lattices of nonequilibrium photon condensates. Starting from linearized fluctuation theory and the properties of vortices, we propose an analytical formula for the critical point containing four fitting para...

[Phys. Rev. A 104, 043516] Published Thu Oct 14, 2021

]]>We theoretically investigate light scattering from an array of atoms into the guided modes of a waveguide. We observe that the scattering of a plane-wave laser field into the waveguide modes is dramatically enhanced for angles that deviate from the geometric Bragg angle. This modified Bragg conditio...

[Phys. Rev. A 104, 043517] Published Thu Oct 14, 2021

]]>[Phys. Rev. A 104, 049903] Published Thu Oct 14, 2021

]]>Dissipative systems often exhibit wavelength-dependent loss rates. One prominent example is Rydberg polaritons formed by electromagnetically induced transparency, which have long been a leading candidate for studying the physics of interacting photons and also hold promise as a platform for quantum ...

[Phys. Rev. A 104, L041303] Published Thu Oct 14, 2021

]]>One of the most important and useful entropic uncertainty relations concerns a $d$-dimensional system and two mutually unbiased measurements. In such a setting, the sum of two information entropies is lower bounded by $lnd$. It has recently been shown that projective measurements subject to operational ...

[Phys. Rev. A 104, 042210] Published Wed Oct 13, 2021

]]>We define the Wigner entropy of a quantum state as the differential Shannon entropy of the Wigner function of the state. This quantity is properly defined only for states that possess a positive Wigner function, which we name Wigner-positive states, but we argue that it is a proper measure of quantu...

[Phys. Rev. A 104, 042211] Published Wed Oct 13, 2021

]]>We analyze the task of encoding classical information into a quantum system under the restriction by symmetry. Motivated by an analogy between the resource theories of asymmetry and entanglement, we ask whether an analog of superdense coding is possible in the former. I.e., we investigate whether th...

[Phys. Rev. A 104, 042413] Published Wed Oct 13, 2021

]]>We describe methods for simulating general second-quantized Hamiltonians using the compact encoding, in which qubit states encode only the occupied modes in physical occupation number basis states. These methods apply to second-quantized Hamiltonians composed of a constant number of interactions, i....

[Phys. Rev. A 104, 042607] Published Wed Oct 13, 2021

]]>Systematic theoretical data of positron binding to atoms [C. Harabati, V. A. Dzuba, and V. V. Flambaum, Phys. Rev. A **89**, 022517 (2014)] are handled by machine learning techniques. Despite the existence of unsystematic errors in the calculations, it becomes possible to identify, through bound-unbound...

[Phys. Rev. A 104, 042808] Published Wed Oct 13, 2021

]]>The nonequilibrium dynamics of vortices in two-dimensional quantum fluids can be predicted by accounting for the way in which vortex ellipticity is coupled to the gradient in background fluid density. In the absence of nonlinear interactions, a harmonically trapped fluid can be analyzed analytically...

[Phys. Rev. A 104, 043306] Published Wed Oct 13, 2021

]]>We investigate the universal nonequilibrium dynamics of the superradiant phase transition in the anisotropic quantum Rabi model. By introducing position and momentum operators, we find the generators and the displaced operators to diagonalize the anisotropic Hamiltonian, and then obtain the ground s...

[Phys. Rev. A 104, 043307] Published Wed Oct 13, 2021

]]>Topological photonics provides a new platform to control and manipulate the flow of light in photonic devices that exhibit topological phase transitions. One way to introduce such transition of geometric phases in photonic waveguides is to modulate the structure of the photonic crystals, array waveg...

[Phys. Rev. A 104, 043513] Published Wed Oct 13, 2021

]]>[Phys. Rev. A 104, 049902] Published Wed Oct 13, 2021

]]>Verifiable blind quantum computation provides a cloud scenario for scalable quantum information processing. However, constructing one resource-efficient verification protocol is still an open problem. In this paper, the context of verification we consider is the measurement-based model, in which the...

[Phys. Rev. A 104, 042412] Published Tue Oct 12, 2021

]]>We consider the problem of discriminating quantum states, where the task is to distinguish two different quantum states with a complete classical knowledge about them, and the problem of classifying quantum states, where the task is to distinguish two classes of quantum states where no prior classic...

[Phys. Rev. A 104, 042606] Published Tue Oct 12, 2021

]]>The present paper provides a joint experimental and theoretical study of positron scattering from pyrazine. Experimental data were measured employing a low-energy positron beamline, and covered an energy range from 1 to 79 eV. Cross sections were measured for total scattering, total elastic scatteri...

[Phys. Rev. A 104, 042807] Published Tue Oct 12, 2021

]]>Photoelectron holography in strong-field tunneling ionization is an efficient way to probe the structures and the ultrafast dynamics information of atoms and molecules. Manipulating the process of photoelectron holography is important for its application. Here, we study theoretically strong-field ph...

[Phys. Rev. A 104, 043107] Published Tue Oct 12, 2021

]]>Cherenkov radiation is one of the central effects in relativistic electrodynamics, which lends its name to a vast class of optical phenomena in which a moving source emits off-axis radiation, giving rise to a signature Cherenkov emission cone. When a radiation source is confined to a finite path, ho...

[Phys. Rev. A 104, 043509] Published Tue Oct 12, 2021

]]>Parity-time $\left(\mathcal{PT}\right)$ symmetry, originally conceived for non-Hermitian open quantum systems, has opened an exciting avenue towards coherent control of light for significant applications. Here we propose a paradigm towards non-Hermitian photonics based on the charge-parity $\left(\mathcal{CP}\right)$ symmetry, in which the char...

[Phys. Rev. A 104, 043510] Published Tue Oct 12, 2021

]]>An optical ring resonator with third-order, or Kerr, nonlinearity will exhibit symmetry breaking between the two counterpropagating circulating powers when pumped with sufficient power in both the clockwise and counterclockwise directions. This is due to the effects of self- and cross-phase modulati...

[Phys. Rev. A 104, 043511] Published Tue Oct 12, 2021

]]>We propose that the Fröhlich condensate of phonons can be realized in optomechanical systems. The system consists of a one-dimensional array of membranes coupled to the cavity field via a quadratic interaction, and the cavity is pumped by an external laser. Analytical and numerical results demonstra...

[Phys. Rev. A 104, 043512] Published Tue Oct 12, 2021

]]>We apply the molecular convergent close-coupling method to the calculation of linear polarization fractions for Fulcher-band fluorescence following electron-impact excitation of the ${\mathrm{H}}_{2}$ $d\phantom{\rule{0.16em}{0ex}}{}^{3}{\mathrm{\Pi}}_{u}$ state. The results exhibit the opposite threshold behavior compared to the only previous calculations [Meneses...

[Phys. Rev. A 104, L040801] Published Tue Oct 12, 2021

]]>We introduce the notion of a reverse quantum speed limit for arbitrary quantum evolution which answers a fundamental question: How slowly can a quantum system evolve in time? Using the geometrical approach to quantum mechanics, the reverse speed limit follows from the fact that the gauge-invariant l...

[Phys. Rev. A 104, 042209] Published Mon Oct 11, 2021

]]>We generalize the scheme for detection of qubit-environment entanglement to qudit-environment systems. This is of relevance for many-qubit systems and the quantification of the operation of quantum algorithms under the influence of external noise, since only decoherence that is not entangling in its...

[Phys. Rev. A 104, 042411] Published Mon Oct 11, 2021

]]>We provide and experimentally demonstrate an accreditation protocol that upper bounds the variation distance between noisy and noiseless probability distributions of the outputs of arbitrary quantum computations. We accredit the outputs of 24 quantum circuits executed on programmable superconducting...

[Phys. Rev. A 104, 042603] Published Mon Oct 11, 2021

]]>It is well known that any quantum gate can be decomposed into the universal gate set {$T,H$, cnot}, and recent results have shown that each of these gates can be implemented using a dynamic quantum walk, which is a continuous-time quantum walk on a sequence of graphs. This procedure for converting a q...

[Phys. Rev. A 104, 042604] Published Mon Oct 11, 2021

]]>Internal states of polar molecules can be controlled by microwave-frequency electric dipole transitions. If the applied microwave electric field has a spatial gradient, these transitions also affect the motion of these dipolar particles. This capability can be used to engineer phonon-mediated quantu...

[Phys. Rev. A 104, 042605] Published Mon Oct 11, 2021

]]>Electron-impact single, double, and triple ionizations are investigated for the ${\mathrm{B}}^{+}$ ion. The direct and indirect ionization processes are studied for the single and double ionization. Good agreement with measurements for the single and double ionization is obtained when the scaled distorted-wave cros...

[Phys. Rev. A 104, 042804] Published Mon Oct 11, 2021

]]>A theoretical approach is developed for the Herman-Wallis factors describing the variation of the line intensities caused by rovibrational interaction in a linear molecule. In the case of ${\nu}_{2}$ and ${\nu}_{3}$ fundamentals and the ${\nu}_{1}+{\nu}_{3}/2{\nu}_{2}+{\nu}_{3}$ resonance combination band in a ${\mathrm{CO}}_{2}$ molecule, our theory is capable ...

[Phys. Rev. A 104, 042805] Published Mon Oct 11, 2021

]]>The scattering of ions in solids is accompanied with momentum transfer and electronic excitations resulting in the slowing down of the ion. The amount of energy transferred in a single scattering event depends on the particular trajectory which can be traced back through the scattering angle. Perfor...

[Phys. Rev. A 104, 042806] Published Mon Oct 11, 2021

]]>We design a neural network to extract and process features from absorption images taken of one-dimensional Bose gases in the quasicondensate regime. Specifically, the network is trained to predict both the temperature of single realizations of the system and the uncertainty thereof. For multiple rea...

[Phys. Rev. A 104, 043305] Published Mon Oct 11, 2021

]]>As an arising hotspot in nonlinear science, soliton molecules are found to have intriguing internal dynamics originating from the nonlinear interactions between closely spaced pulses. In dissipative systems with saturable gain and loss, the soliton molecule composed of unequal pulses is inferred to ...

[Phys. Rev. A 104, 043508] Published Mon Oct 11, 2021

]]>Taking inspiration from the human eye, the authors propose using a five-level molecule to detect up to two photons of different frequency that arrive sequentially. They use two formalisms to develop this model: a density-matrix method to achieve analytical results and characterize the proposed detector, and a Hamiltonian method that they show is well suited for numerical calculations.

[Phys. Rev. A 104, 043703] Published Mon Oct 11, 2021

]]>The condensation of Cooper pairs, originating from the Fermi-surface instability due to a weakly attractive interaction between two fermions, opened a new frontier for exploring many-body physics in interdisciplinary contexts. In this work, we discuss the possible condensation of Cooper triples, whi...

[Phys. Rev. A 104, L041302] Published Mon Oct 11, 2021

]]>Wave-particle duality is a bizarre feature at the heart of quantum mechanics which refers to the mutually exclusive dual attributes of quantum objects as the wave and the particle. Quantum eraser presents a counterintuitive aspect of the wave-particle duality. In this paper, we show that quantum era...

[Phys. Rev. A 104, 042207] Published Fri Oct 08, 2021

]]>We show that quantum absorption refrigerators, which have traditionally been studied as of three qubits, each of which is connected to a thermal reservoir, can also be constructed by using three qubits and two thermal baths, where two of the qubits, including the qubit to be locally cooled, are conn...

[Phys. Rev. A 104, 042208] Published Fri Oct 08, 2021

]]>Building on known quantum control methods, the authors propose a technique to scalably use optimal control to simulate quantum dynamics. They validate this approach with numerical simulation of a system of superconducting transmons.

[Phys. Rev. A 104, 042602] Published Fri Oct 08, 2021

]]>It is shown that variation of the one-particle dispersion in a universal many-body system enables us to obtain Tan's adiabatic sweep theorem and its generalization. The derivation is based on the Hellmann-Feynman theorem and the variational theorem for the scattering length suggested in our previous...

[Phys. Rev. A 104, 043304] Published Fri Oct 08, 2021

]]>In this paper, we investigate the light-bullet dynamics during femtosecond laser filamenation in an anomalous dispersion regime based on the experimentally observed blueshifted resonant radiation (RR) in fused silica. A numerical simulation is performed and well reproduces the pronounced asymmetric ...

[Phys. Rev. A 104, 043506] Published Fri Oct 08, 2021

]]>Dissipative cavity solitons (CSs) in a Kerr resonator have wide applications from optical communications to spectroscopy due to their broad bandwidth. Although the broadband spectrum ultrashort pulses are easy to be generated in a high-$Q$ microresonator, such kinds of solitons in the macroscopic fibe...

[Phys. Rev. A 104, 043507] Published Fri Oct 08, 2021

]]>[Phys. Rev. A 104, 049901] Published Fri Oct 08, 2021

]]>Single-shot images are the standard readout of experiments with ultracold atoms, the imperfect reflection of their many-body physics. The efficient extraction of observables from single-shot images is thus crucial. Here we demonstrate how artificial neural networks can optimize this extraction. In c...

[Phys. Rev. A 104, L041301] Published Fri Oct 08, 2021

]]>We present a general master equation, correct to second order in the system-environment coupling strength, that takes into account the initial system-environment correlations. We assume that the system and its environment are in a joint thermal equilibrium state, and thereafter, a unitary operation ...

[Phys. Rev. A 104, 042205] Published Thu Oct 07, 2021

]]>It is shown that the photon position operator $\widehat{\stackrel{\u20d7}{X}}$ with commuting components can be written in the momentum representation as $\widehat{\stackrel{\u20d7}{X}}=i\widehat{\stackrel{\u20d7}{D}}$, where $\widehat{\stackrel{\u20d7}{D}}$ is a flat connection in the tangent bundle $T({\mathbb{R}}^{3}\setminus \{(0,0,{k}_{3})\in {\mathbb{R}}^{3}:{k}_{3}\ge 0\})$ over ${\mathbb{R}}^{3}\setminus \{(0,0,{k}_{3})\in {\mathbb{R}}^{3}:{k}_{3}\ge 0\}$ equipped with the Cartesian structure. Moreover, $\widehat{\stackrel{\u20d7}{D}}$ is such...

[Phys. Rev. A 104, 042206] Published Thu Oct 07, 2021

]]>We describe a quantum-assisted machine learning method in which multivariate data are encoded into quantum states in a Hilbert space whose dimension is exponentially large in the length of the data vector. Learning in this space occurs through applying a low-depth quantum circuit with a tree-tensor-...

[Phys. Rev. A 104, 042408] Published Thu Oct 07, 2021

]]>We investigate the delocalization of quantum information in the nonequilibrium dynamics of the $XY$ spin chain with asymptotically decaying interactions $\sim 1/{r}^{\alpha}$. As a figure of merit, we employ the tripartite mutual information (TMI), the sign of which indicates if quantum information is predominantly s...

[Phys. Rev. A 104, 042409] Published Thu Oct 07, 2021

]]>Current fault-tolerant quantum computation protocols require the preparation of a large number of auxiliary qubits. In contrast, the “weight parity error correction” introduced here is a remarkably qubit-efficient technique for correcting even high-weight errors in some stabilizer codes, provided that the weight parity is known.

[Phys. Rev. A 104, 042410] Published Thu Oct 07, 2021

]]>Starting from a recently developed model based on the generalized Lorenz-Mie theory, we simulate and experimentally investigate the resonance spectrum and the scattered light field of whispering-gallery modes (WGMs) in a liquid droplet excited with a free-space visible laser beam. Depending on the i...

[Phys. Rev. A 104, 043504] Published Thu Oct 07, 2021

]]>Numerical modeling of scattering of a plane elliptically polarized monochromatic wave on a silicon spherical nanoparticle is carried out. In the resulting light field near the particle, the topology of strips, formed by the axes of the polarization ellipses and the normal vectors to their planes, is...

[Phys. Rev. A 104, 043505] Published Thu Oct 07, 2021

]]>We analyze the requirements for fault-tolerant quantum computation with atom-atom gates based on cavity quantum electrodynamics (cQED) mediated by a photon with a finite pulse length. For short photon pulses, the distorted shape of the reflected pulses from the cQED system is a serious error source....

[Phys. Rev. A 104, 043702] Published Thu Oct 07, 2021

]]>We study the geometric Uhlmann phase of entangled mixed states in a composite system made of two coupled spin-$\frac{1}{2}$ particles with a magnetic field acting on one of them. Within a uniform noisy quantum channel setup, an exact analytical expression for this geometric phase in each subsystem is derived. ...

[Phys. Rev. A 104, 042204] Published Wed Oct 06, 2021

]]>Recently, it was shown that quantum steerability is stronger than the bound set by the instrumental causal network. This implies that quantum instrumentality cannot simulate Einstein-Podolsky-Rosen (EPR) -nonlocal correlations completely. Here we show that quantum instrumentality uniquely and comple...

[Phys. Rev. A 104, 042407] Published Wed Oct 06, 2021

]]>Charge transfer processes between weakly bound entities play an important role in various chemical and biological environments. In this combined experimental and theoretical work, we investigate the nature of charge-transfer processes in homogeneous atomic and heterogeneous atomic-molecular clusters...

[Phys. Rev. A 104, 042802] Published Wed Oct 06, 2021

]]>Shell-confined atoms can serve as a generalized model to explain both the *free* and *confined* conditions. In this scenario, an atom is trapped inside two concentric spheres of inner $\left({R}_{a}\right)$ and outer $\left({R}_{b}\right)$ radii. The choice of ${R}_{a}$ and ${R}_{b}$ renders four different quantum-mechanical systems. In hydrogenic atom...

[Phys. Rev. A 104, 042803] Published Wed Oct 06, 2021

]]>The length scale separation in dilute quantum gases in quasi-one-dimensional or quasi-two-dimensional traps has spatially divided the system into two distinct regimes. Whereas universal relations defined in strict one or two dimensions apply in a scale that is much larger than the characteristic len...

[Phys. Rev. A 104, 043303] Published Wed Oct 06, 2021

]]>A simple phenomenological model, justified by rigorous electromagnetic analysis, is used to examine far-field polarization modulation introduced by a metallic screen with two subwavelength slits in uniform, partially polarized illumination. The accuracy of this intuitive model is assessed numericall...

[Phys. Rev. A 104, 043503] Published Wed Oct 06, 2021

]]>The Hong-Ou-Mandel effect lies at the heart of quantum interferometry, having multiple applications in the field of quantum information processing and no classical counterpart. Despite its popularity, only a few works have considered polarization-frequency interaction within the interferometer. In t...

[Phys. Rev. A 104, 042201] Published Tue Oct 05, 2021

]]>The quantum speed limit for open quantum systems in the non-Markovian regime is analyzed. We provide a lower bound for the time required to transform an initial state to a final state in terms of thermodynamic quantities such as the energy fluctuation, entropy production rate, and dynamical activity...

[Phys. Rev. A 104, 042202] Published Tue Oct 05, 2021

]]>We present a detailed thermodynamic analysis of a three-level quantum heat engine coupled continuously to hot and cold reservoirs. The system is driven by an oscillating external field and is described by the Markovian quantum master equation. We use the general form of the dissipator which is consi...

[Phys. Rev. A 104, 042203] Published Tue Oct 05, 2021

]]>The process of entanglement swapping showed that suitable measurements can generate nonlocal correlations even from particles that never interacted directly. This fact was generalized to the concept of bilocality for a quantum network, where there are three observers sharing two independent sources....

[Phys. Rev. A 104, 042405] Published Tue Oct 05, 2021

]]>Correlations between a system and its environment lead to errors in an open quantum system. Detecting those correlations would be valuable for avoiding and/or correcting those errors. Here we show that we can detect correlations by measuring only the system itself if we know the cause of the interac...

[Phys. Rev. A 104, 042406] Published Tue Oct 05, 2021

]]>Quantum sensors offer the capability to reach unprecedented precision by operating at the standard quantum limit (SQL) or beyond by using quantum entanglement. But an emerging class of quantum sensors that use Rydberg electromagnetically induced transparency (EIT) to detect rf electric fields have y...

[Phys. Rev. A 104, 043103] Published Tue Oct 05, 2021

]]>We present an implementation of a time-dependent multiconfiguration self-consistent-field method [R. Anzaki, T. Sato, and K. L. Ishikawa, Phys. Chem. Chem. Phys. **19**, 22008 (2017)] with the full configuration-interaction expansion for coupled electron-nuclear dynamics in diatomic molecules subject to...

[Phys. Rev. A 104, 043104] Published Tue Oct 05, 2021

]]>We study the photoionization of molecule ${\mathrm{H}}_{2}^{+}$ in an XUV pulse by numerically solving the time-dependent Schrödinger equation simulation and focus on a zeptosecond birth time delay of a photoelectron from the different cores. We propose a simple and robust method to extract accurately the zeptosecond ...

[Phys. Rev. A 104, 043105] Published Tue Oct 05, 2021

]]>Cooling down a trapped ion into its motional ground state is a central step for trapped-ion-based quantum information processing. State-of-the-art cooling schemes often work under a set of optimal cooling conditions derived analytically using a perturbative approach, in which the sideband coupling i...

[Phys. Rev. A 104, 043106] Published Tue Oct 05, 2021

]]>A semiclassical theory that describes the generation of a coherent anti-Stokes Raman scattering (CARS) signal is presented that maximizes vibrational coherence in a mode predetermined by the pump, the Stokes, and the probe chirped pulse trains and takes into account the field propagation effects in ...

[Phys. Rev. A 104, 043701] Published Tue Oct 05, 2021

]]>On the basis of an algebraic-geometric approach, the authors provide a rigorous characterization of pure states of three-qudit systems in terms of a finite number of families and subfamilies. The characterization has operational relevance for quantifying entanglement as a resource.

[Phys. Rev. A 104, 042402] Published Mon Oct 04, 2021

]]>A direct measurement protocol allows reconstructing specific elements of the density matrix of a quantum state without using quantum state tomography. However, the direct measurement protocols to date are primarily based on weak or strong measurements with an ancillary pointer, which interacts with ...

[Phys. Rev. A 104, 042403] Published Mon Oct 04, 2021

]]>Einstein-Podolsky-Rosen steering describes a quantum correlation in addition to entanglement and Bell nonlocality. However, conceptually different from entanglement and Bell nonlocality, quantum steering has an asymmetric definition. Motivated by the asymmetric definition of quantum steering, we stu...

[Phys. Rev. A 104, 042404] Published Mon Oct 04, 2021

]]>The authors present a computational analysis of dissociative recombination of CH${}^{+}$, in which both direct and indirect mechanisms are included. Good agreement with experiments is found in a wide regime while an explanation for disagreement was provided at lower energies. The theoretical method used in this study could be applicable in a wide range of diatomic cations.

[Phys. Rev. A 104, 042801] Published Mon Oct 04, 2021

]]>We study relativistic effects in photoionization of a hydrogen atom exposed to an intense laser pulse of general ellipticity. The frequency of the laser pulse resides in the ultraviolet region. To this end, the semirelativistic approach introduced in Kjellsson Lindblom *et al.* [T. Kjellsson Lindblom,...

[Phys. Rev. A 104, 043102] Published Mon Oct 04, 2021

]]>Bose-Einstein condensation, observed in either strongly interacting liquid helium or weakly interacting atomic Bose gases, is widely known to be a second-order phase transition. Here we predict a first-order Bose-Einstein condensation in a cloud of harmonically trapped bosons interacting with both a...

[Phys. Rev. A 104, 043301] Published Mon Oct 04, 2021

]]>Dynamical localization is the analog of Anderson localization in momentum space, where the system's energy saturates and the single-particle wave functions are exponentially localized in momentum space. In the presence of interactions, in the context of a periodically kicked Bose gas, it has been ar...

[Phys. Rev. A 104, 043302] Published Mon Oct 04, 2021

]]>We develop a general formalism to study laser operation in active microring resonators supporting two counterpropagating modes. Our formalism is based on the coupled-mode equations of motion for the field amplitudes in the two counterpropagating modes and a linearized analysis of the small perturbat...

[Phys. Rev. A 104, 043501] Published Mon Oct 04, 2021

]]>An approach is introduced for the nonparametric reconstruction of the statistical properties of penetrable, isotropic randomly rough surfaces from in-plane, co-polarized light scattering data. Starting from expressions within the Kirchhoff approximation for the light scattered diffusely by a two-dim...

[Phys. Rev. A 104, 043502] Published Mon Oct 04, 2021

]]>The concept of quantum discord aims at unveiling quantum correlations that go beyond those described by entanglement. Its original formulation [L. Henderson and V. Vedral, J. Phys. A: Math. Gen. **34**, 6899 (2001); H. Ollivier and W. H. Zurek, Phys. Rev. Lett. **88**, 017901 (2001)] is difficult to compute...

[Phys. Rev. A 104, 042401] Published Fri Oct 01, 2021

]]>Constructing quantum circuits for efficient state preparation are central topics in the field of quantum information and computation. As the number of qubits grows quickly, methods to derive large-scale quantum circuits are strongly desired. In this article, we propose the automatically differentiab...

[Phys. Rev. A 104, 042601] Published Fri Oct 01, 2021

]]>By numerically solving the non-Born-Oppenheimer time-dependent Schrödinger equation of ${\mathrm{H}}_{2}$ in which the dynamics is confined along the laser polarization direction, we study the electron localization in the single-photon dissociative ionization of ${\mathrm{H}}_{2}$. The single ionization of ${\mathrm{H}}_{2}$ produces a free elect...

[Phys. Rev. A 104, 043101] Published Fri Oct 01, 2021

]]>We study the optimization of the performance of arbitrary periodically driven thermal machines. Within the assumption of fast modulation of the driving parameters, we derive the optimal cycle that universally maximizes the extracted power of heat engines, the cooling power of refrigerators, and in g...

[Phys. Rev. A 104, 032226] Published Thu Sep 30, 2021

]]>For over six decades, quantum electrodynamics (QED) in multipolar form has been an invaluable tool for understanding quantum-scale atomic and molecular interactions. However, its relation to the Poincaré gauge has been a recent topic of controversy and debate. It was claimed by Rousseau and Felbacq ...

[Phys. Rev. A 104, 032227] Published Thu Sep 30, 2021

]]>When observations must come from incompatible devices and cannot be produced by compatible devices is a property that motivates two integer-valued quantifications of incompatibility, called incompatibility dimension and compatibility dimension. The first one quantifies how many states are minimally ...

[Phys. Rev. A 104, 032228] Published Thu Sep 30, 2021

]]>We present an analysis of spatial chirp in subcycle pulsed beams corroborated by spatiotemporal electro-optic sampling measurements of terahertz radiation. Modeling the subcycle pulsed beam as a superposition of monochromatic Gaussian beams, free-space propagation is shown to directly lead to latera...

[Phys. Rev. A 104, 032229] Published Thu Sep 30, 2021

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