Quantum Physics
New submissions
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New submissions for Thu, 23 Nov 17
 [1] arXiv:1711.07982 [pdf, other]

Title: Symmetryenriched topological order in tensor networks: Defects, gauging and anyon condensationComments: 76 + 2 pages, many figures, many tables, comments welcomeSubjects: Quantum Physics (quantph); Strongly Correlated Electrons (condmat.strel)
We study symmetryenriched topological order in twodimensional tensor network states by using graded matrix product operator algebras to represent symmetry induced domain walls. A close connection to the theory of graded unitary fusion categories is established. Tensor network representations of the topological defect superselection sectors are constructed for all domain walls. The emergent symmetryenriched topological order is extracted from these representations, including the symmetry action on the underlying anyons. Dual phase transitions, induced by gauging a global symmetry, and condensation of a bosonic subtheory, are analyzed and the relationship between topological orders on either side of the transition is derived. Several examples are worked through explicitly.
 [2] arXiv:1711.07994 [pdf, other]

Title: Continuous phasespace representations for finitedimensional quantum states and their tomographyComments: 6 pages, 3 figuresSubjects: Quantum Physics (quantph)
Continuous phase spaces have become a powerful tool for describing, analyzing, and tomographically reconstructing quantum states in quantum optics and beyond. A plethora of these phasespace techniques are known, however a thorough understanding of their relations was still lacking for finitedimensional quantum states. We present a unified approach to continuous phasespace representations which highlights their relations and tomography. The quantumoptics case is then recovered in the largespin limit. Our results will guide practitioners to design robust innovative tomography schemes.
 [3] arXiv:1711.08017 [pdf, other]

Title: Continuous variable entanglement of counterpropagating twin beamsComments: 14 pages, 8 figuresSubjects: Quantum Physics (quantph)
This work describes the continuousvariable entanglement of the counterpropagating twin beams generated in a Mirrorless Optical Parametric Oscillator below threshold, encompassing both their quadrature and photonnumber correlation. In the first case, a comparison with the singlepass copropagating geometry outlines the huge difference of the bandwidth involved and a completely different stability of the two sources with respect to the phaseangle. In the second case, stimulated by the critical divergence of the correlation time evidenced by Corti et al., we address the issue of the temporal bandwidth of the intensity squeezing.
 [4] arXiv:1711.08066 [pdf, other]

Title: Measurement Contextuality and Planck's ConstantSubjects: Quantum Physics (quantph)
Contextuality is a necessary resource for universal quantum computation and noncontextual quantum mechanics can be simulated efficiently by classical computers in many cases. Orders of Planck's constant, $\hbar$, can also be used to characterize the classicalquantum divide by expanding quantities of interest in powers of $\hbar$all orders higher than $\hbar^0$ can be interpreted as quantum corrections to the order $\hbar^0$ term. We show that contextual measurements in finitedimensional systems have formulations within the WignerWeylMoyal (WWM) formalism that require higher than order $\hbar^0$ terms to be included in order to violate the classical bounds on their expectation values. As a result, we show that contextuality as a resource is equivalent to orders of $\hbar$ as a resource within the WWM formalism. This explains why qubits can only exhibit stateindependent contextuality under Pauli observables as in the PeresMermin square while odddimensional qudits can also exhibit statedependent contextuality. In particular, we find that qubit Pauli observables lack an order $\hbar^0$ contribution in their Weyl symbol and so exhibit contextuality regardless of the state being measured. On the other hand, odddimensional qudit observables generally possess nonzero order $\hbar^0$ terms, and higher, in their WWM formulation, and so exhibit contextuality depending on the state measured: odddimensional qudit states that exhibit measurement contextuality have an order $\hbar^1$ contribution that allows for the violation of classical bounds while states that do not exhibit measurement contextuality have insufficiently large order $\hbar^1$ contributions.
 [5] arXiv:1711.08098 [pdf, ps, other]

Title: Randomized Benchmarking Using Unitary tDesign for Fidelity Estimation of Practical Quantum CircuitComments: 15 pages, 3 figuresSubjects: Quantum Physics (quantph)
Randomized benchmarking is a useful scheme for characterizing the noise in quantum system. However, it is insensitive to practical unitary errors. We propose a method of applying unitary tdesign in quantum process tomography with local random unitary operator, which is constructed by a lot of nearest neighboring twoqubit unitary operators, to estimate average fidelity. This method converts the estimation of unitary errors to the analysis of pseudorandomness about a set of unitary operators. We then give a upper bound of a diamond norm between arbitrary and invariant Haar distribution to form an \epsilonapproximate unitary tdesign. We apply \epsilonapproximate unitary tdesign to a largescale quantum circuit to analysis the errors caused by practical implementation.
 [6] arXiv:1711.08112 [pdf, other]

Title: Strong unitary and overlap uncertainty relations: theory and experimentAuthors: KokWei Bong, Nora Tischler, Raj B. Patel, Sabine Wollmann, Geoff J. Pryde, Michael J. W. HallComments: 5 pages of main text, 4 pages of Supplemental MaterialSubjects: Quantum Physics (quantph)
We theoretically and experimentally investigate a strong uncertainty relation valid for any $n$ unitary operators, which implies the standard uncertainty relation as a special case, and which can be written in terms of geometric phases. It is saturated by every pure state of any $n$dimensional quantum system, generates a tight overlap uncertainty relation for the transition probabilities of any $n+1$ pure states, and gives an upper bound for the outoftimeorder correlation function. We test these uncertainty relations experimentally for photonic polarisation qubits, including the minimum uncertainty states of the overlap uncertainty relation, via interferometric measurements of generalised geometric phases.
 [7] arXiv:1711.08196 [pdf, other]

Title: Strictly local onedimensional topological quantum error correction with symmetryconstrained cellular automataComments: Submission to SciPostSubjects: Quantum Physics (quantph); Cellular Automata and Lattice Gases (nlin.CG)
Active quantum error correction on topological codes is one of the most promising routes to longterm qubit storage. In view of future applications, the scalability of the used decoding algorithms in physical implementations is crucial. In this work, we focus on the onedimensional Majorana chain and construct a strictly local decoder based on a selfdual cellular automaton. We study numerically and analytically its performance and exploit these results to contrive a scalable decoder with exponentially growing decoherence times in the presence of noise. Our results pave the way for scalable and modular designs of actively corrected onedimensional topological quantum memories.
 [8] arXiv:1711.08249 [pdf, ps, other]

Title: Vacuum fluctuations and radiation reaction contributions to the resonance dipoledipole interaction between two atoms near a reflecting boundaryComments: 12 pages, 12 figuresSubjects: Quantum Physics (quantph)
We investigate the resonance dipoledipole interaction energy between two identical atoms, one in the ground state and the other in the excited state, interacting with the electromagnetic field in the presence of a perfectly reflecting plane boundary. The atoms are prepared in a correlated (symmetric or antisymmetric) Belltype state. Following a procedure due to Dalibard, DupontRoc, and CohenTannoudji, we separate the contributions of vacuum fluctuations and radiation reaction (source) field to the resonance interaction energy between the two atoms, and show that only the source field contributes to the interatomic interaction, while vacuum field fluctuations do not. By considering specific geometric configurations of the twoatomsystem with respect to the mirror and specific choices of dipole orientations, we show that the presence of the mirror significantly affects the resonance interaction energy, and that new features appear with respect to the case of atoms in free space, for example a change in the spatial dependence of the interaction. Our findings also suggest that the presence of a boundary can be exploited to tailor and control the resonance interaction between two atoms, as well as the related energy transfer process. Possibility to observe these phenomena is also discussed.
 [9] arXiv:1711.08255 [pdf, other]

Title: Highspeed and highperformance polarizationbased quantum key distribution system without side channel effects caused by multiple lasersSubjects: Quantum Physics (quantph)
Side channel effects such as temporal disparity and intensity fluctuation of photon pulses caused by random bit generation with multiple laser diodes in highspeed polarizationbased BB84 quantum key distribution (QKD) systems can be eliminated by increasing DC bias current condition. However, background photons caused by the spontaneous emission process under high DC bias current degrade the performance of the QKD systems. In this study, we investigated, for the first time, the effects of spontaneously emitted photons on the system performance in a highspeed QKD system at a clock rate of 400 MHz. Also, we further show improvements of system performance without side channel effects by utilizing temporal filtering technique with realtime FPGA signal processing.
 [10] arXiv:1711.08276 [pdf, ps, other]

Title: Optimization of Quantum Key Distribution ProtocolsComments: 29 pages and 10 figuresSubjects: Quantum Physics (quantph)
Quantum Key Distribution is a practically implementable informationtheoretic secure method for transmitting keys to remote partners performing quantum communication. After examining various protocols from the simplest such as QC and BB84 we move on to describe BBM92, DPSK, SARG04 and finally MDI from the largest possible communication distance and highest secret key bitrate. We discuss how any protocol can be optimized by reviewing the various steps and underlying assumptions proper to every protocol with the corresponding consequence in each case.
 [11] arXiv:1711.08281 [pdf, ps, other]

Title: Analysis of atmospheric effects on satellite based quantum communication: A comparative studySubjects: Quantum Physics (quantph); Information Theory (cs.IT)
Quantum Key Distribution (QKD) is a key exchange protocol which is implemented over free space optical links and optical fiber cable. When direct communication is not possible, QKD is performed over fiber cables, but the imperfections in detectors used at receiver side and also the material properties of fiber cables limit the long distance communication. Free space based quan tum key distribution is free from such limitations, and can pave way for satellite based quantum communication to set up a global network for sharing secret messages. To implement free space optical (FSO) links, it is essential to study the effect of atmospheric turbulence. Here, an analysis is made for satellite based quantum communication using QKD protocols. The results obtained indicate that SARG04 protocol is an effective approach for satellite based quantum communication.
 [12] arXiv:1711.08302 [pdf, other]

Title: Generation of short hard Xray pulses of tailored duration using a Mössbauer sourceComments: 8 pages, 6 figuresSubjects: Quantum Physics (quantph)
We theoretically investigate a scheme for generations of single hard Xray pulses of controllable duration in the range of 1 ns  100 ns from a radioactive M\"ossbauer source. The scheme uses a magnetically perturbed $^{57}$FeBO$_3$ crystal illuminated with recoilless 14.4 keV photons from a radioisotope $^{57}$Co nuclide. Such compact Xray source is useful for the extension of quantum optics to 10 keV energy scale which has been spotlighted in recent years. So far, experimental achievements are mostly performed in synchrotron radiation facilities. However, tabletop and portable hard Xray sources are still limited for timeresolved measurements and for implementing coherent controls over nuclear quantum optics systems. The availability of compact hard Xray sources may become the engine to apply schemes of quantum information down to the subatomic scale. We demonstrate that the present method is versatile and provides an economic solution utilizing a M\"ossbauer source to perform timeresolved nuclear scattering, to produce suitable pulses for photon storage and to flexibly generate Xray singlephoton entanglement.
 [13] arXiv:1711.08318 [pdf, ps, other]

Title: Local boxcounting dimensions of discrete quantum eigenvalue spectra: Analytical connection to quantum spectral statisticsSubjects: Quantum Physics (quantph); Chaotic Dynamics (nlin.CD)
Two decades ago, Wang and Ong [Phys. Rev. A 55, 1522 (1997)] hypothesized that the local boxcounting dimension of a discrete quantum spectrum should depend exclusively on the nearestneighbor spacing distribution (NNSD) of the spectrum. In this paper, we validate their hypothesis by deriving an explicit formula for the local boxcounting dimension of a countablyinfinite discrete quantum spectrum. This formula expresses the local boxcounting dimension of a spectrum in terms of single and double integrals of the NNSD of the spectrum. As applications, we derive an analytical formula for Poisson spectra and closedform approximations to the local boxcounting dimension for spectra having Gaussian orthogonal ensemble (GOE), Gaussian unitary ensemble (GUE), and Gaussian symplectic ensemble (GSE) spacing statistics. In the Poisson and GOE cases, we compare our theoretical formulas with the published numerical data of Wang and Ong and observe excellent agreement between their data and our theory. We also study numerically the local boxcounting dimensions of the Riemann zeta function zeros and the alternate levels of GOE spectra, which are often used as numerical models of spectra possessing GUE and GSE spacing statistics, respectively. In each case, the corresponding theoretical formula is found to accurately describe the numericallycomputed local boxcounting dimension.
 [14] arXiv:1711.08320 [pdf, other]

Title: Distribution of OffDiagonal Cross Sections in Quantum Chaotic Scattering: Exact Results and Data ComparisonSubjects: Quantum Physics (quantph)
The recently derived distributions for the scatteringmatrix elements in quantum chaotic systems are not accessible in the majority of experiments, whereas the cross sections are. We analytically compute distributions for the offdiagonal cross sections in the Heidelberg approach, which is ap plicable to a wide range of quantum chaotic systems. We thus eventually fully solve a problem which already arose more than half a century ago in compoundnucleus scattering. We compare our results with data from microwave and compoundnucleus experiments, particularly addressing the transition from isolated resonances towards the Ericson regime of strongly overlapping ones.
 [15] arXiv:1711.08351 [pdf, ps, other]

Title: Efficient decoding of random errors for quantum expander codesComments: 31 pagesSubjects: Quantum Physics (quantph); Information Theory (cs.IT)
We show that quantum expander codes, a constantrate family of quantum LDPC codes, with the quasilinear time decoding algorithm of Leverrier, Tillich and Z\'emor can correct a constant fraction of random errors with very high probability. This is the first construction of a constantrate quantum LDPC code with an efficient decoding algorithm that can correct a linear number of random errors with a negligible failure probability. Finding codes with these properties is also motivated by Gottesman's construction of fault tolerant schemes with constant space overhead.
In order to obtain this result, we study a notion of $\alpha$percolation: for a random subset $W$ of vertices of a given graph, we consider the size of the largest connected $\alpha$subset of $W$, where $X$ is an $\alpha$subset of $W$ if $X \cap W \geq \alpha X$.  [16] arXiv:1711.08399 [pdf, ps, other]

Title: Completely subradiant multiatom architectures through 2D photonic crystalsSubjects: Quantum Physics (quantph)
Inspired by recent advances in the manipulation of atoms trapped near 1D waveguides and pro posals to use surface acoustic waves on piezoelectric substrates for the same purpose, we show the potential of twodimensional platforms. We exploit the directional emission of atoms near photonic crystal slabs with square symmetry to build perfect subradiant states of 2 distant atoms, possible in 2D only for finite lattices with reflecting boundaries. We also show how to design massively parallel 1D arrays of atoms above a single crystal, useful for multiport output of nonclassical light, by ex ploiting destructive interference of guided resonance modes due to finite size effects. Directionality of the emission is shown to be present whenever a linear isofrequency manifold is present in the dispersion relation of the crystal. Multiatom radiance properties can be obtained from a simple crosstalk coefficient of a master equation, which we compare with exact atomcrystal dynamics, showing its predictive power.
 [17] arXiv:1711.08427 [pdf, ps, other]

Title: Generalized Formalism for Information Backflow in assessing Markovianity and its equivalence to DivisibilityAuthors: Sagnik ChakrabortyComments: 7 pages including appendices, 1 figure, comments and suggestions are welcomeSubjects: Quantum Physics (quantph)
We present a general framework for the information backflow (IB) approach of Markovianity, that not only includes a large number, if not all, of IB prescriptions proposed so far, but also is equivalent to CPdivisibility for invertible evolutions. Following the common approach of IB, where monotonic decay of some physical property is seen as the definition of Markovianity, we propose, in our framework, a general description of what should be called a proper `physicality quantifier' to define Markovianity. We elucidate different properties of our framework and use it to show that generalized tracedistance measure in $2$ dimension and quantum mutual information, for invertible dynamics, in any dimension serve as sufficient criteria for IBMarkovianity for a number of prescriptions, suggested earlier in literature.
Crosslists for Thu, 23 Nov 17
 [18] arXiv:1711.07988 (crosslist from condmat.quantgas) [pdf, other]

Title: Coupling two order parameters in a quantum gasComments: 8 pages, 7 figuresSubjects: Quantum Gases (condmat.quantgas); Materials Science (condmat.mtrlsci); Strongly Correlated Electrons (condmat.strel); Quantum Physics (quantph)
Controlling matter to simultaneously support multiple coupled properties is of fundamental and technological importance. For example, the simultaneous presence of magnetic and ferroelectric orders in multiferroic materials leads to enhanced functionalities. In hightemperature superconductors, intertwining between charge and spinorder can form superconducting states at high transition temperatures. However, pinning down the microscopic mechanisms responsible for the simultaneous presence of different orders is difficult, making it hard to predict the phenomenology of a material or to experimentally modify its properties. Here we use a quantum gas to engineer an adjustable interaction at the microscopic level between two orders, and demonstrate scenarios of competition, coexistence and coupling between them. In the latter case, intriguingly, the presence of one order lowers the critical point of the other. Our system is realized by a BoseEinstein condensate which can undergo selforganization phase transitions in two optical resonators, resulting in two distinct crystalline density orders. We characterize the intertwining between these orders by measuring the composite order parameter and the elementary excitations. We explain our results with a meanfield free energy model, which is derived from a microscopic Hamiltonian. Our system is ideally suited to explore properties of quantum tricritical points as recently realized in and can be extended to study the interplay of spin and density orders also as a function of temperature.
 [19] arXiv:1711.08027 (crosslist from condmat.statmech) [pdf, ps, other]

Title: Understanding Quantum Tunneling using Diffusion Monte Carlo SimulationsComments: 9 pages, 7 figuresSubjects: Statistical Mechanics (condmat.statmech); Quantum Physics (quantph)
In simple ferromagnetic quantum Ising models characterized by an effective doublewell energy landscape the characteristic tunneling time of pathintegral Monte Carlo (PIMC) simulations has been shown to scale as the incoherent quantumtunneling time, i.e., as $1/\Delta^2$, where $\Delta$ is the tunneling gap. Since incoherent quantum tunneling is employed by quantum annealers (QAs) to solve optimization problems, this result suggests there is no quantum advantage in using QAs w.r.t. quantum Monte Carlo (QMC) simulations. A counterexample is the recently introduced shamrock model, where topological obstructions cause an exponential slowdown of the PIMC tunneling dynamics with respect to incoherent quantum tunneling, leaving the door open for potential quantum speedup, even for stoquastic models. In this work, we investigate the tunneling time of projective QMC simulations based on the diffusion Monte Carlo (DMC) algorithm without guiding functions, showing that it scales as $1/\Delta$, i.e., even more favorably than the incoherent quantumtunneling time, both in a simple ferromagnetic system and in the more challenging shamrock model. However a careful comparison between the DMC groundstate energies and the exact solution available for the transversefield Ising chain points at an exponential scaling of the computational cost required to keep a fixed relative error as the system size increases.
 [20] arXiv:1711.08039 (crosslist from cs.CC) [pdf, other]

Title: Alternating minimization, scaling algorithms, and the nullcone problem from invariant theoryComments: 48 pagesSubjects: Computational Complexity (cs.CC); Mathematical Physics (mathph); Algebraic Geometry (math.AG); Quantum Physics (quantph)
Alternating minimization heuristics seek to solve a (difficult) global optimization task through iteratively solving a sequence of (much easier) local optimization tasks on different parts (or blocks) of the input parameters. While popular and widely applicable, very few examples of this heuristic are rigorously shown to converge to optimality, and even fewer to do so efficiently.
In this paper we present a general framework which is amenable to rigorous analysis, and expose its applicability. Its main feature is that the local optimization domains are each a group of invertible matrices, together naturally acting on tensors, and the optimization problem is minimizing the norm of an input tensor under this joint action. The solution of this optimization problem captures a basic problem in Invariant Theory, called the nullcone problem.
This algebraic framework turns out to encompass natural computational problems in combinatorial optimization, algebra, analysis, quantum information theory, and geometric complexity theory. It includes and extends to high dimensions the recent advances on (2dimensional) operator scaling.
Our main result is a fully polynomial time approximation scheme for this general problem, which may be viewed as a multidimensional scaling algorithm. This directly leads to progress on some of the problems in the areas above, and a unified view of others. We explain how faster convergence of an algorithm for the same problem will allow resolving central open problems.
Our main techniques come from Invariant Theory, and include its rich noncommutative duality theory, and new bounds on the bitsizes of coefficients of invariant polynomials. They enrich the algorithmic toolbox of this very computational field of mathematics, and are directly related to some challenges in geometric complexity theory (GCT).  [21] arXiv:1711.08120 (crosslist from physics.optics) [pdf, other]

Title: Sorting photons by radial quantum numberAuthors: Yiyu Zhou, Mohammad Mirhosseini, Dongzhi Fu, Jiapeng Zhao, Seyed Mohammad Hashemi Rafsanjani, Alan E. Willner, Robert W. BoydSubjects: Optics (physics.optics); Quantum Physics (quantph)
The LaguerreGaussian (LG) modes constitute a complete basis set for representing the transverse structure of a {paraxial} photon field in free space. Earlier workers have shown how to construct a device for sorting a photon according to its azimuthal LG mode index, which describes the orbital angular momentum (OAM) carried by the field. In this paper we propose and demonstrate a mode sorter based on the fractional Fourier transform (FRFT) to efficiently decompose the optical field according to its radial profile. We experimentally characterize the performance of our implementation by separating individual radial modes as well as superposition states. The reported scheme can, in principle, achieve unit efficiency and thus can be suitable for applications that involve quantum states of light. This approach can be readily combined with existing OAM mode sorters to provide a complete characterization of the transverse profile of the optical field.
 [22] arXiv:1711.08259 (crosslist from condmat.meshall) [pdf, ps, other]

Title: Dynamics of quantum collapse in coupled quantum dotsAuthors: H. CruzSubjects: Mesoscale and Nanoscale Physics (condmat.meshall); Quantum Physics (quantph)
In this letter, we have considered an electron in a coupled quantum dot system interacting with a detector represented by a point contact. We present a dynamical model for wave function collapse in the strong coupling to the detector limit. In our model, the electron in the double quantum dot makes a fast transition minimizing the emission of electromagnetic radiation. In this way, a principle of leats emitted radiation can provide a possible description of wave function collapse.
Replacements for Thu, 23 Nov 17
 [23] arXiv:1506.02910 (replaced) [pdf, other]

Title: Cavitymediated collective lasercooling of a noninteracting atomic gas inside an asymmetric trap to very low temperaturesComments: 12 pages, 3 figures, final versionSubjects: Quantum Physics (quantph)
 [24] arXiv:1602.03783 (replaced) [src]

Title: Nosignaling versus quantum constraints for spatiotemporal correlations caused by weak measurementComments: The paper is superseded by arXiv:1702.00078Journalref: Phys. Rev. A 96, 012124 (2017)Subjects: Quantum Physics (quantph)
 [25] arXiv:1607.02094 (replaced) [pdf, other]

Title: Magnetooptic effects of the Cosmic Microwave BackgroundAuthors: Damian EjlliComments: Additional references added. More details have been added in the introduction and discussion sections. Slightly reduced version with respect to previous one. Unchanged final resultsSubjects: Cosmology and Nongalactic Astrophysics (astroph.CO); General Relativity and Quantum Cosmology (grqc); High Energy Physics  Phenomenology (hepph); Quantum Physics (quantph)
 [26] arXiv:1609.06528 (replaced) [pdf, other]

Title: Quantum model for mode locking in pulsed semiconductor quantum dotsComments: 20.1 pages, including appendices; 7 figures; with Erratum and corrected Figs. 2 and 3Journalref: Phys. Rev. B 94, 245308 (2016); Erratum: Phys. Rev. B 96, 199904 (2017)Subjects: Mesoscale and Nanoscale Physics (condmat.meshall); Quantum Physics (quantph)
 [27] arXiv:1609.09060 (replaced) [pdf, other]

Title: Machine Learning Topological StatesComments: 12 pages, 7 figures, accepted for publication in Phys. Rev. BJournalref: Phys. Rev. B 96, 195145 (2017)Subjects: Disordered Systems and Neural Networks (condmat.disnn); Statistical Mechanics (condmat.statmech); Strongly Correlated Electrons (condmat.strel); Quantum Physics (quantph)
 [28] arXiv:1703.07673 (replaced) [pdf, other]

Title: Quantum dynamics of two coupled spins under controllable and fluctuating magnetic fieldsComments: 11 pages, 5 figuresSubjects: Quantum Physics (quantph)
 [29] arXiv:1704.08291 (replaced) [pdf, other]

Title: Dynamics and thermodynamics of a central spin immersed in a spin bathComments: Close to published versionJournalref: Phys. Rev. A 96, 052125 (2017)Subjects: Quantum Physics (quantph)
 [30] arXiv:1705.05982 (replaced) [pdf, ps, other]

Title: Understanding Quality Factor Degradation in Superconducting Niobium Cavities at Low Microwave Field AmplitudesComments: final versionSubjects: Accelerator Physics (physics.accph); Superconductivity (condmat.suprcon); Quantum Physics (quantph)
 [31] arXiv:1705.06901 (replaced) [pdf, other]

Title: Topological networks for quantum communication between distant qubitsComments: 11 pages, 7 figures; supplement: 27 pages, 9 figures; updated to published versionJournalref: npj Quantum Information 3, 47 (2017)Subjects: Quantum Physics (quantph); Other Condensed Matter (condmat.other)
 [32] arXiv:1705.10953 (replaced) [pdf, other]

Title: The effects of filtering on the purity of heralded single photons from parametric sourcesComments: 9 pages, 9 figuresJournalref: Phys. Rev. A 96, 053842 (2017)Subjects: Quantum Physics (quantph)
 [33] arXiv:1706.04793 (replaced) [pdf, other]

Title: Husimi function and phasespace analysis of bilayer quantum Hall systems at $ν=2/λ$Comments: 13 pages, 6 figures. New section added. Novel results and insights further highlightedSubjects: Mesoscale and Nanoscale Physics (condmat.meshall); Quantum Physics (quantph)
 [34] arXiv:1706.09543 (replaced) [pdf, ps, other]

Title: Absence of replica symmetry breaking in the transverse and longitudinal random field Ising modelAuthors: C. ItoiComments: 17 pagesSubjects: Mathematical Physics (mathph); Disordered Systems and Neural Networks (condmat.disnn); Quantum Physics (quantph)
 [35] arXiv:1707.07859 (replaced) [pdf, other]

Title: Wigner Function Reconstruction in Levitated OptomechanicsComments: 9 pages, 3 figuresJournalref: Quantum Measurements and Quantum Metrology, 4(1), pp. 1725 (2017)Subjects: Quantum Physics (quantph); Optics (physics.optics)
 [36] arXiv:1708.01392 (replaced) [pdf, ps, other]

Title: Phonon antibunching effect in coupled nonlinear micro/nanomechanical resonator at finite temperatureComments: 7 pages, 7 figureJournalref: EPL, 119 (2017) 58001Subjects: Quantum Physics (quantph); Mesoscale and Nanoscale Physics (condmat.meshall)
 [37] arXiv:1708.05103 (replaced) [pdf, other]

Title: Completeness and Nonclassicality of Coherent States for Generalized Oscillator AlgebrasComments: 26 pages, 10 figures, minor changes, misprints correctedSubjects: Quantum Physics (quantph)
 [38] arXiv:1708.06507 (replaced) [pdf, other]
 [39] arXiv:1709.03276 (replaced) [pdf, ps, other]

Title: Quantum neural networks driven by information reservoirComments: 10 Pages, 4 FiguresSubjects: Quantum Physics (quantph)
 [40] arXiv:1709.03348 (replaced) [pdf, other]

Title: Relativity, Anomalies and Objectivity Loophole in Recent Tests of Local RealismAuthors: Adam BednorzComments: 6 pages, 3 figures, submitted to the special issue of De Gruyter Open Physics, EverNew "Loopholes" in Bell's Argument and Experimental TestsJournalref: Open Physics 15, 692 (2017)Subjects: Quantum Physics (quantph)
 [41] arXiv:1710.02813 (replaced) [pdf, other]

Title: EinsteinPodolskyRosen steering and Bell nonlocality of two macroscopic mechanical oscillators in optomechanical systemsComments: More references added. To appear in PRASubjects: Quantum Physics (quantph)
 [42] arXiv:1710.09053 (replaced) [pdf, other]

Title: Controlled Quantum SearchComments: 7 pages, 2 figuresSubjects: Quantum Physics (quantph)
 [43] arXiv:1711.00732 (replaced) [pdf, ps, other]

Title: Experimental and theoretical comparison of the cooling performance between standard and doublebright EIT coolingAuthors: Nils Scharnhorst, Javier Cerrillo, Johannes Kramer, Ian D. Leroux, Jannes B. Wübbena, Alex Retzker, Piet O. SchmidtComments: 15 pages, 13 figures. Minor changes in the text, new title, and supplementary material moved to the appendix. Results unchanged from first versionSubjects: Quantum Physics (quantph); Atomic Physics (physics.atomph)
 [44] arXiv:1711.04771 (replaced) [pdf, other]

Title: Next Generation Dynamical MeanField Theory Simulations with the Adaptive Sampling Configuration Interaction MethodComments: 4+ pages, 4 figures, supplemental informationSubjects: Strongly Correlated Electrons (condmat.strel); Materials Science (condmat.mtrlsci); Quantum Physics (quantph)
 [45] arXiv:1711.06676 (replaced) [pdf, ps, other]

Title: Sidebands suppression of 852 nm Cesium Faraday anomalous dispersion optical filter by argon gasSubjects: Atomic Physics (physics.atomph); Quantum Physics (quantph)
 [46] arXiv:1711.07665 (replaced) [pdf, other]

Title: Superconducting Gatemon Qubit based on a Proximitized TwoDimensional Electron GasAuthors: Lucas Casparis, Malcolm R. Connolly, Morten Kjaergaard, Natalie J. Pearson, Anders Kringhøj, Thorvald W. Larsen, Ferdinand Kuemmeth, Tiantian Wang, Candice Thomas, Sergei Gronin, Geoffrey C. Gardner, Michael J. Manfra, Charles M. Marcus, Karl D. PeterssonSubjects: Mesoscale and Nanoscale Physics (condmat.meshall); Quantum Physics (quantph)
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