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Generating entanglement of photon-number states with coherent light via cross-Kerr nonlinearityApr 12 2007We propose a scheme for generating entangled states of light fields. This scheme only requires the cross-Kerr nonlinear interaction between coherent light-beams, followed by a homodyne detection. Therefore, this scheme is within the reach of current technology. ... More

Pure spin current and perfect valley filter by designed separation of the chiral states in two-dimensional honeycomb latticesOct 08 2016We propose a realization of pure spin currents and perfect valley filter based on a quantum anomalous Hall insulator, around which edge states with up-spin and down-spin circulate. By applying staggered sublattice potential on the strips along the edges ... More

Decoherence-free quantum memory for photonic state using atomic ensemblesNov 04 2008Large scale quantum information processing requires stable and long-lived quantum memories. Here, using atom-photon entanglement, we propose an experimentally feasible scheme to realize decoherence-free quantum memory with atomic ensembles, and show one ... More

Anomalous spatial shifts in interface electronic scatteringJan 02 2019The anomalous spatial shifts at interface scattering, first studied in geometric optics, recently found their counterparts in the electronic context. It was shown that both longitudinal and transverse shifts, analogous to the Goos-Hanchen and Imbert-Fedorov ... More

Trigonal warping induced terraced spin texture and nearly perfect spin polarization in graphene with Rashba effectOct 24 2017Electrical tunability of spin polarization has been a focus in spintronics. Here, we report that the trigonal warping (TW) effect, together with spin-orbit coupling (SOC), can lead to two distinct magnetoelectric effects in low-dimensional systems. Taking ... More

Two-qubit controlled phase gate based on two nonresonant quantum dots trapped in a coupled-cavity arrayApr 13 2011We propose a scheme for realizing quantum controlled phase gates with two nonidentical quantum dots trapped in two coupled photonic crystal cavities and driven by classical laser fields under the condition of non-small hopping limit. During the gate operation, ... More

Scalable quantum information processing with atomic ensembles and flying photonsOct 04 2009We present a scheme for scalable quantum information processing (QIP) with atomic ensembles and flying photons. Using the Rydberg blockade, we encode the qubits in the collective atomic states, which could be manipulated fast and easily due to the enhanced ... More

An unconventional geometric phase gate with two nonresonant quantum dots trapped in a photonic crystal cavityNov 28 2010Jun 23 2011We propose a scheme for realizing a two-qubit controlled phase gate via an unconventional geometric phase with two nonresonant quantum dots trapped in a photonic crystal cavity. In this system, the quantum dots simultaneously interact with a large detuned ... More

Controllable single-photon nonreciprocal transmission in a cavity optomechanical system with a weak coherent drivingMar 27 2018Apr 10 2018We study the nonreciprocal transmission of a single-photon in a cavity optomechanical system, in which the cavity supports a clockwise and a counter-clockwise circulating optical modes, the mechanical resonator (MR) is excited by a weak coherent driving, ... More

Goos-Hänchen-like shifts at metal/superconductor interfaceMar 26 2018At a normal-metal/superconductor interface, an incident electron from the normal-metal (N) side can be normally reflected as an electron or Andreev reflected as a hole. We show that pronounced lateral shifts along the interface between the incident and ... More

Predicted Unusual Magnetoresponse in Type-II Weyl SemimetalsApr 14 2016Aug 19 2016We show several distinct signatures in the magneto-response of type-II Weyl semimetals. The energy tilt tends to squeeze the Landau levels (LLs), and for a type-II Weyl node, there always exists a critical angle between the B-fileld and the tilt, at which ... More

Nonreciprocal transmission and fast-slow light effects in a cavity optomechanical systemJan 04 2019We study the nonreciprocal transmission and the fast-slow light effects in a cavity optomechanical system, in which the cavity supports a clockwise and a counter-clockwise circulating optical modes, both the two modes are driven simultaneously by a strong ... More

A single-photon router based on a modulated cavity optomechanical systemApr 19 2018Apr 26 2018We investigate the routing of a single-photon in a modulated cavity optomechanical system, in which the cavity is driven by a strong coupling field, and the mechanical resonator (MR) is modulated with a weak coherent field. We show that, when there is ... More

Realization of universal quantum cloning with SQUID qubits in a cavityJul 04 2007Jul 05 2007We propose a scheme to realize $1\to 2$ universal quantum cloning machine (UQCM) with superconducting quantum interference device (SQUID) qubits, embeded in a high-Q cavity. CNOT operations are derived to present our scheme, and the two-photon Raman resonance ... More

Transverse Shift in Andreev ReflectionJun 12 2017An incoming electron is reflected back as a hole at a normal-metal-superconductor interface, a process known as Andreev reflection. We predict that there exists a universal transverse shift in this process due to the effect of spin-orbit coupling in the ... More

Unconventional pairing induced anomalous transverse shift in Andreev reflectionAug 23 2017Sep 20 2018Superconductors with unconventional pairings have been a fascinating subject of research, for which a central issue is to explore effects that can be used to characterize the pairing. The process of Andreev reflection--the reflection of an electron as ... More

$d$-Orbital Topological Insulator and Semimetal in Antifluorite Cu$_2$S Family: Contrasting Spin Helicities, Nodal Box, and Hybrid Surface StatesMar 27 2017We reveal a class of three-dimensional $d$-orbital topological materials in the antifluorite Cu$_2$S family. Derived from the unique properties of low-energy $t_{2g}$ states, their phases are solely determined by the sign of spin-orbit coupling (SOC): ... More

Neutral Carbon Emission in luminous infrared galaxies The \CI\ Lines as Total Molecular Gas TracersApr 25 2017We present a statistical study on the [C I]($^{3} \rm P_{1} \rightarrow {\rm ^3 P}_{0}$), [C I] ($^{3} \rm P_{2} \rightarrow {\rm ^3 P}_{1}$) lines (hereafter [C I] (1$-$0) and [C I] (2$-$1), respectively) and the CO (1$-$0) line for a sample of (ultra)luminous ... More

Generalized effective-potential Landau theory for the two-dimensional extended Bose-Hubbard modelOct 24 2018We analytically study the quantum phase diagrams of ultracold dipolar Bose gases in an optical square lattice at zero temperature by using the generalized effective-potential Landau theory (GEPLT). For a weak nearest-neighbor repulsion, our analytical ... More

Homotopy theory of presheaves of simplicial groupoidsJan 21 2004We show that the category of presheaves of simplicial groupoids on a site $\mathcal{C}$ is a right proper simplicial model category. We define $G$-torsor of presheaf of 2-groupoids $G$, presheaf of simplicial groups $G$ and presheaf of simplicial groupoids ... More

The Lie Group Structure of the $η-ξ$ Space-time and its Physical SignificanceDec 08 2004The $\eta-\xi$ space-time is suggested by Gui for the quantum field theory in 1988. This paper consists of two parts. The first part is devoted to the discussion of the global properties of the $\eta-\xi$ space-time. The result contains a proof which ... More

A primal-dual algorithm with optimal stepsizes and its application in decentralized consensus optimizationNov 18 2017We consider a primal-dual algorithm for minimizing $f(x)+h(Ax)$ with differentiable $f$. The primal-dual algorithm has two names in literature: Primal-Dual Fixed-Point algorithm based on the Proximity Operator (PDFP$^2$O) and Proximal Alternating Predictor-Corrector ... More

Covering groupoidsDec 12 2004Topos properties of the category of covering groupoids over a fixed groupoid are discussed. A classification result for connected covering groupoids over a fixed groupoid analogous to the fundamental theorem of Galois theory is given.

The scalable quantum computation based on quantum dot systemsJan 10 2011Jan 20 2011We propose a scheme for realizing the scalable quantum computation based on nonidentical quantum dots trapped in a single-mode waveguide. In this system, the quantum dots simultaneously interact with a large detuned waveguide and classical light fields. ... More

Transverse shift in crossed Andreev reflectionSep 07 2018Nov 30 2018Crossed Andreev reflection (CAR) is an intriguing effect that occurs in a normal-superconductor-normal junction. In CAR, an incoming electron from one terminal is coherently scattered as an outgoing hole into the other terminal. Here, we reveal that there ... More

Asynchronous Stochastic Proximal Optimization Algorithms with Variance ReductionSep 27 2016Regularized empirical risk minimization (R-ERM) is an important branch of machine learning, since it constrains the capacity of the hypothesis space and guarantees the generalization ability of the learning algorithm. Two classic proximal optimization ... More

Three-dimensional Pentagon Carbon with a genesis of emergent fermionsJun 11 2017Carbon, the basic building block of our universe, enjoys a vast number of allotropic structures. Owing to its bonding characteristic, most carbon allotropes possess the motif of hexagonal rings. Here, with first-principles calculations, we discover a ... More

Coexistence of four-band nodal rings and triply-degenerate nodal points in centrosymmetric metal diboridesApr 12 2017Topological metals with protected band-crossing points have been attracting great interest. Here we report novel topological band features in a family of metal diboride materials. Using first- principles calculations, we show that these materials are ... More

Two-dimensional Spin-Orbit Dirac Point in Monolayer HfGeTeJun 27 2017Oct 12 2017Dirac points in two-dimensional (2D) materials have been a fascinating subject of research, with graphene as the most prominent example. However, the Dirac points in existing 2D materials, including graphene, are vulnerable against spin-orbit coupling ... More

The SYSU System for the Interspeech 2015 Automatic Speaker Verification Spoofing and Countermeasures ChallengeJul 24 2015Jul 29 2015Many existing speaker verification systems are reported to be vulnerable against different spoofing attacks, for example speaker-adapted speech synthesis, voice conversion, play back, etc. In order to detect these spoofed speech signals as a countermeasure, ... More

Valley-Layer Coupling: A New Design Principle for ValleytronicsApr 13 2019We introduce the concept of valley-layer coupling (VLC) in two-dimensional materials, where the low-energy electronic states in the emergent valleys have valley-contrasted layer polarization such that each state is spatially localized on the top or bottom ... More

Magic wavelengths for the $6s^2\,^1S_0-6s6p\,^3P_1^o$ transition in ytterbium atomDec 24 2017The static and dynamic electric-dipole polarizabilities of the $6s^2\,^1S_0$ and $6s6p\,^3P_1^o$ states of Yb are calculated by using the relativistic ab initio method. Focusing on the red detuning region to the $6s^2\,^1S_0-6s6p\,^3P_1^o$ transition, ... More

Quantum controlled phase gate based on two nonresonant quantum dots trapped in two coupled photonic crystal cavitiesDec 04 2010Jan 15 2011We propose a scheme for realizing two-qubit quantum phase gates with two nonidentical quantum dots trapped in two coupled photonic crystal cavities and driven by classical laser fields. During the gate operation, neither the cavity modes nor the quantum ... More

From Type-II Triply Degenerate Nodal Points and Three-Band Nodal Rings to Type-II Dirac Points in Centrosymmetric Zirconium OxideOct 21 2017Nov 13 2017Using first-principles calculations, we report that ZrO is a topological material with the coexistence of three pairs of type-II triply degenerate nodal points (TNPs) and three nodal rings (NRs), when spin-orbit coupling (SOC) is ignored. Noticeably, ... More

Sharp Bounds for Neuman Means in Terms of Geometric, Arithemtic and Quadratic MeansMay 17 2014In this paper, we find the greatest values $\alpha_{1}$, $\alpha_{2}$, $\alpha_{3}$, $\alpha_{4}$, $\alpha_{5}$, $\alpha_{6}$, $\alpha_{7}$, $\alpha_{8}$ and the least values $\beta_{1}$, $\beta_{2}$, $\beta_{3}$, $\beta_{4}$, $\beta_{5}$, $\beta_{6}$, ... More

Almost ideal nodal-loop semimetal in monoclinic CuTeO$_3$ materialMar 12 2018Jun 28 2018Nodal-loop semimetals are materials in which the conduction and valence bands cross on a one-dimensional loop in the reciprocal space. For the nodal-loop character to manifest in physical properties, it is desired that the loop is close to the Fermi level, ... More

Hourglass Weyl loops in two dimensions: Theory and material realization in monolayer GaTeI familyFeb 25 2019Nodal loops in two-dimensional (2D) systems are typically vulnerable against spin-orbit coupling (SOC). Here, we explore 2D systems with a type of doubly degenerate nodal loops that are robust under SOC and feature an hourglass type dispersion. We present ... More

Three dimensional ring vortex solitons and their stability in Bose-Einstein condensates under magnetic confinementAug 03 2012The three-dimensional study of the ring vortex solitons is conducted for both attractive and repulsive BECs subject to harmonic potential confinement. A family of stationary ring vortex solitons, which is defined by the radial excitation number and the ... More

Early thermalization of quark-gluon matter with the elastic scattering of ggq and ggqbarMay 22 2013Elastic gluon-gluon-quark (gluon-gluon-antiquark) scattering is studied in perturbative QCD with 123 Feynman diagrams at the tree level. Individually squared amplitudes and interference terms of the Feynman diagrams are derived. With the elastic gluon-gluon-quark ... More

Quantum entanglement distribution with hybrid parity gateFeb 22 2019We propose a scheme for entanglement distribution among different single atoms trapped in separated cavities. In our scheme, by reflecting an input coherent optical pulse from a cavity with a single trapped atom, a controlled phase-shift gate between ... More

Hybrid Nodal Loop Metal: Unconventional Magnetoresponse and Material RealizationFeb 03 2018A nodal loop is formed by band crossing along a one-dimensional closed manifold, with each point on the loop a linear nodal point in the transverse dimensions and can be classified as type-I or type-II depending on the band dispersion. Here, we propose ... More

Hourglass Dirac Chain Metal in Rhenium DioxideMay 03 2017Nonsymmorphic symmetries, which involve fractional lattice translations in crystalline materials, can generate exotic types of fermionic excitations that are robust against spin-orbit coupling. Here we report on a hourglass-type dispersion in the bulk ... More

Experimental Investigation of Longitudinal Space-Time Correlations of the Velocity Field in Turbulent Rayleigh-Bénard ConvectionDec 01 2010Jan 19 2011We report an experimental investigation of the longitudinal space-time cross-correlation function of the velocity field, $C(r,\tau)$, in a cylindrical turbulent Rayleigh-B\'{e}nard convection cell using the particle image velocimetry (PIV) technique. ... More

Quadratic and Cubic Nodal Lines Stabilized by Crystalline SymmetryJul 07 2018In electronic band structures, nodal lines may arise when two (or more) bands contact and form a one-dimensional manifold of degeneracy in the Brillouin zone. Around a nodal line, the dispersion for the energy difference between the bands is typically ... More

Weyl-loop half metal in Li$_3$(FeO$_3$)$_2$Nov 13 2018Nodal-line metals and semimetals, as interesting topological states of matter, have been mostly studied in nonmagnetic materials. Here, based on first-principles calculations and symmetry analysis, we predict that fully spin-polarized Weyl loops can be ... More

Fair Efficiency Comparisons of Decoy-state Quantum Key Distribution ProtocolsMar 11 2018Secure key rate of decoy-state quantum key distribution protocols has been improved with biased basis choice, however, the security standards and parameters of current protocols are different. As a result, we cannot give an accurate key rate comparison ... More

Asynchronous Stochastic Gradient Descent with Delay CompensationSep 27 2016Jun 14 2017With the fast development of deep learning, it has become common to learn big neural networks using massive training data. Asynchronous Stochastic Gradient Descent (ASGD) is widely adopted to fulfill this task for its efficiency, which is, however, known ... More

The simplest massive S-matrix: from minimal coupling to Black HolesDec 20 2018Jan 16 2019In this paper, we explore the physics of electromagnetically and gravitationally coupled massive higher spin states from the on-shell point of view. Starting with the three-point amplitude, we focus on the simplest amplitude which is characterized by ... More

Mirror Protected Multiple Nodal Line Semimetals and Material RealizationApr 19 2018The conventional k.p method fails to capture the full and essential physics of many symmetry enriched multiple nodal line structures in the three dimensional Brillouin zone. Here we present a new and systematical method to construct the effective lattice ... More

Composite Dirac SemimetalApr 12 2019Weak topological insulators and Dirac semimetals are gapped and nodal phases with distinct topological properties, respectively. Here, we propose a novel topological phase that exhibits features of both and is dubbed composite Dirac semimetal (CDSM). ... More

A scheme for generating entangled cluster state of atomic ensemblesDec 27 2008It was shown in Ref.[Phys.Rev.A 77,045802(2008)] that the dynamics of a control atom and an atomic sample interacting dispersively with a cavity can be discribed by the Jaynes-Cummings model and the collective mode of the atomic sample can be analogous ... More

Circumventing the no-go theorem: A single Weyl point surrounded by nodal wallsMar 21 2019Despite of a rapidly expanding inventory of possible crystalline Weyl semimetals, all of them are constrained by the Nielsen-Ninomiya no-go theorem, namely, that left- and right-handed Weyl points appear in pairs. With time-reversal (T) symmetry, an even ... More

Composite Dirac SemimetalApr 12 2019Apr 16 2019Weak topological insulators and Dirac semimetals are gapped and nodal phases with distinct topological properties, respectively. Here, we propose a novel topological phase that exhibits features of both and is dubbed composite Dirac semimetal (CDSM). ... More

Improving the efficiency of joint remote state preparation in noisy environment with weak measurementDec 19 2016Quantum secure communication provides a new way for protecting the security of information. As an important component of quantum secure communication, remote state preparation (RSP) can securely transmit a quantum state from a sender to a remote receiver. ... More

Effect of quantum noise on deterministic joint remote state preparation of a qubit state via a GHZ channelJun 08 2016Sep 08 2016Quantum secure communication brings a new direction for information security. As an important component of quantum secure communication, deterministic joint remote state preparation (DJRSP) could securely transmit a quantum state with 100\% success probability. ... More

A lower bound of concurrence for multipartite quantum statesMar 18 2009We study the concurrence of arbitrary multipartite mixed quantum states. An explicit lower bound of the concurrence is derived, which detects quantum entanglement of some states better than some separability criteria, and gives sufficient conditions for ... More

Artificial gravity field, astrophysical analogues, and topological phase transitions in strained topological semimetalsSep 02 2016May 10 2017Effective gravity and gauge fields are emergent properties intrinsic for low-energy quasiparticles in topological semimetals. Here, taking two Dirac semimetals as examples, we demonstrate that applied lattice strain can generate warped spacetime, with ... More

Multi-wavelength study of the supernova remnant Kes 79 (G33.6+0.1): On its supernova properties and expansion into a molecular environmentDec 11 2016Kes 79 (G33.6+0.1) is an aspherical thermal composite supernova remnant (SNR) observed across the electromagnetic spectrum and showing an unusual highly-structured morphology, in addition to harboring a central compact object (CCO). Using the CO J=1-0, ... More

The cosmic ray muon tomography facility based on large scale MRPC detectorApr 18 2015Cosmic ray muon tomography is a novel technology to detect high-Z material. A prototype of TUMUTY with 73.6 cm x 73.6 cm large scale position sensitive MRPC detectors has been developed and is introduced in this paper. Three test kits have been tested ... More

Two-dimensional nodal-loop half metal in monolayer MnNMar 12 2019Two-dimensional (2D) materials with nodal-loop band crossing have been attracting great research interest. However, it remains a challenge to find 2D nodal loops that are robust against spin-orbit coupling (SOC) and realized in magnetic states. Here, ... More

Nodal surface semimetals: Theory and material realizationDec 28 2017Mar 13 2018We theoretically study the three-dimensional topological semimetals with nodal surfaces protected by crystalline symmetries. Different from the well-known nodal-point and nodal-line semimetals, in these materials, the conduction and valence bands cross ... More

Adiabatic approximation in the ultrastrong-coupling regime of a system consisting of an oscillator and two qubitsMar 02 2012We present a system composed of two flux qubits and a transmission-line resonator. Instead of using the rotating wave approximation (RWA), we analyse the system by the adiabatical approximation methods under two opposite extreme conditions. Basic properties ... More

A general correspondence between Dirichlet forms and right processesApr 01 1992The theory of Dirichlet forms as originated by Beurling-Deny and developed particularly by Fukushima and Silverstein, is a natural functional analytic extension of classical (and axiomatic) potential theory. Although some parts of it have abstract measure ... More

Monolayer Mg$_{2}$C: Negative Poisson's ratio and unconventional 2D emergent fermionsJun 21 2018Novel two-dimensional (2D) emergent fermions and negative Poisson's ratio in 2D materials are fascinating subjects of research. Here, based on first-principles calculations and theoretical analysis, we predict that the hexacoordinated Mg$_{2}$C monolayer ... More

Nonsymmorphic-symmetry-protected hourglass Dirac loop, nodal line, and Dirac point in bulk and monolayer $X_3$SiTe$_6$ ($X=$ Ta, Nb)Oct 23 2017Jan 17 2018Nonsymmorphic space group symmetries can generate exotic band-crossings in topological metals and semimetals. Here, based on symmetry analysis and first-principles calculations, we reveal rich band-crossing features in the existing layered compounds Ta$_3$SiTe$_6$ ... More

Hybrid Dirac Semimetal in CaAgBi Materials FamilyJun 13 2017Based on their formation mechanisms, Dirac points in three-dimensional systems can be classified as accidental or essential. The former can be further distinguished into type-I and type-II, depending on whether the Dirac cone spectrum is completely tipped ... More

Type-II nodal loops: theory and material realizationMay 05 2017Aug 22 2017Nodal loop appears when two bands, typically one electron-like and one hole-like, are crossing each other linearly along a one-dimensional manifold in the reciprocal space. Here we propose a new type of nodal loop which emerges from crossing between two ... More

Topological types of 3-dimensional small coversOct 24 2007Apr 16 2009In this paper we study the (equivariant) topological types of a class of 3-dimensional closed manifolds (i.e., 3-dimensional small covers), each of which admits a locally standard $(\mathbb{Z}_2)^3$-action such that its orbit space is a simple convex ... More

On 3-manifolds with locally-standard (Z_2)^3-actionsJul 21 2008Sep 01 2008As a generalization of Davis-Januszkiewicz theory, there is an essential link between locally standard $(\Z_2)^n$-actions (or $T^n$-actions) actions and nice manifolds with corners, so that a class of nicely behaved equivariant cut-and-paste operations ... More

A supra-massive magnetar central engine for short GRB 130603BNov 28 2013We show that the peculiar early optical and in particular X-ray afterglow emission of the short duration burst GRB 130603B can be explained by continuous energy injection into the blastwave from a supra-massive magnetar central engine. The observed energetics ... More

Nodal Loop and Nodal Surface States in Ti3Al Family MaterialsMay 04 2018May 09 2018Topological metals and semimetals are new states of matter which attract great interest in current research. Here, based on first-principles calculations and symmetry analysis, we propose that the family of titanium-based compounds Ti3X (X=Al, Ga, Sn, ... More

Angular Reconstruction of a Lead Scintillating-Fiber Sandwiched Electromagnetic CalorimeterAug 26 2013A new method called Neighbor Cell Deposited Energy Ratio (NCDER) is proposed to reconstruct incidence position in a single layer for a 3-dimensional imaging electromagnetic calorimeter (ECAL).This method was applied to reconstruct the ECAL test beam data ... More

Mapping and Measuring Large-scale Photonic Correlation with Single-photon ImagingJun 25 2018Quantum correlation and its measurement are essential in exploring fundamental quantum physics problems and developing quantum enhanced technologies. Quantum correlation may be generated and manipulated in different spaces, which demands different measurement ... More

Silicon nitride metalenses for unpolarized high-NA visible imagingSep 02 2017As one of nanoscale planar structures, metasurface has shown excellent superiorities on manipulating light intensity, phase and/or polarization with specially designed nanoposts pattern. It allows to miniature a bulky optical lens into the chip-size metalens ... More

A decentralized proximal-gradient method with network independent step-sizes and separated convergence ratesApr 25 2017This paper considers the problem of decentralized optimization with a composite objective containing smooth and non-smooth terms. To solve the problem, a proximal-gradient scheme is studied. Specifically, the smooth and nonsmooth terms are dealt with ... More

Finer Distribution of Quantum Correlations among Multiqubit SystemsDec 01 2018We study the distribution of quantum correlations characterized by monogamy relations in multipartite systems. By using the Hamming weight of the binary vectors associated with the subsystems, we establish a class of monogamy inequalities for multiqubit ... More

New approach for normalization and photon-number distributions of photon-added (-subtracted) squeezed thermal statesDec 05 2011Using the thermal field dynamics theory to convert the thermal state to a "pure" state in doubled Fock space, it is found that the average value of e^{fa^{{\dag}}a} under squeezed thermal state (STS) is just the generating function of Legendre polynomials, ... More

Polygamy relations of multipartite entanglement beyond qubitsMar 27 2019We investigate the polygamy relations related to the concurrence of assistance for any multipartite pure states. General polygamy inequalities given by the $\alpha$th $(0\leq \alpha\leq 2)$ power of concurrence of assistance is first presented for multipartite ... More

Quantifying quantum coherence and non-classical correlation based on Hellinger distanceJun 28 2018Quantum coherence and non-classical correlation are key features of quantum world. Quantifying coherence and non-classical correlation are two key tasks in quantum information theory. First, we present a bona fide measure of quantum coherence by utilizing ... More

Tighter entanglement monogamy relations of qubit systemsFeb 11 2017Monogamy relations characterize the distributions of entanglement in multipartite systems. We investigate monogamy relations related to the concurrence $C$ and the entanglement of formation $E$. We present new entanglement monogamy relations satisfied ... More

Superactivation of monogamy relations for nonadditive quantum correlation measuresMar 27 2019We investigate the general monogamy and polygamy relations satisfied by quantum correlation measures. We show that there exist two real numbers $\alpha$ and $\beta$ such that for any quantum correlation measure $Q$, $Q^x$ is monogamous if $x\geq \alpha$ ... More

Superconformal Algebras in Light-cone Gauge Quantization of String Theories on $AdS_3Sep 15 2000Motivated by superstring theories on $AdS_3$, we construct spacetime superconformal algebras (SCAs) living on the $AdS_3$ boundary in terms of the transversal physical degrees of freedom. The SCAs constructed are N=4 large, middle algebras, and N=3 algebra, ... More

Supersymmetric Hamiltonian Approach to Edge Excitations in $ν= 5/2$ Fractional Quantum Hall EffectJun 11 2007Sep 10 2007A supersymmetric Hamiltonian is constructed for the edge excitations of the Moore-Read (Pfaffian) like state, which is a realization of the N=2 supersymmetric CS model. Fermionic generators and their conjugates are introduced to deal with the fermion ... More

A Note on Normal Forms of Quantum States and SeparabilityDec 12 2008We study the normal form of multipartite density matrices. It is shown that the correlation matrix (CM) separability criterion can be improved from the normal form we obtained under filtering transformations. Based on CM criterion the entanglement witness ... More

On Local Unitary Equivalence of Two and Three-qubit StatesJul 12 2017We study the local unitary equivalence for two and three-qubit mixed states by investigating the invariants under local unitary transformations. For two-qubit system, we prove that the determination of the local unitary equivalence of 2-qubits states ... More

Light-Cone Gauge Quantization of String Theories on $AdS_3$ SpaceDec 23 1998Light-cone gauge quantization procedures are given, for superstring theory on $AdS_3$ space charged with NS-NS background, both in NSR and GS formalism. The spacetime (super)conformal algebras are constructed in terms of the transversal physical degrees ... More

Nonclassicality and decoherence of photon-added squeezed thermal state in thermal environmentOct 30 2011Theoretical analysis is given of nonclassicality and decoherence of the field states generated by adding any number of photons to the squeezed thermal state (STS). Based on the fact that the squeezed number state can be considered as a single-variable ... More

Epidemic Variability in Hierarchical Geographical Networks with Human Activity PatternsApr 03 2012Recently, some studies have revealed that non-Poissonian statistics of human behaviors stem from the hierarchical geographical network structure. On this view, we focus on epidemic spreading in the hierarchical geographical networks, and study how two ... More

Markov jump processes in modeling coalescent with recombinationJul 01 2014Aug 28 2014Genetic recombination is one of the most important mechanisms that can generate and maintain diversity, and recombination information plays an important role in population genetic studies. However, the phenomenon of recombination is extremely complex, ... More

Quasi regular Dirichlet forms and the stochastic quantization problemApr 10 2014Apr 30 2014After recalling basic features of the theory of symmetric quasi regular Dirichlet forms we show how by applying it to the stochastic quantization equation, with Gaussian space-time noise, one obtains weak solutions in a large invariant set. Subsequently, ... More

Constraints on Bose-Einstein-condensed Axion Dark Matter from The HI Nearby Galaxy Survey dataJun 05 2014Aug 01 2014One of the leading candidates for dark matter is axion or axion-like particle in a form of Bose-Einstein condensate (BEC). In this paper, we present an analysis of 17 high-resolution galactic rotation curves from "The H{\footnotesize I} Nearby Galaxy ... More

Fukushima's decomposition for diffusions associated with semi-Dirichlet formsApr 15 2011Aug 15 2011Diffusion processes associated with semi-Dirichlet forms are studied in the paper. The main results are Fukushima's decomposition for the diffusions and a transformation formula for the corresponding martingale part of the decomposition. The results are ... More

Message spreading in networks with stickiness and persistence: Large clustering does not always facilitate large-scale diffusionAug 16 2014Aug 19 2014Recent empirical studies have confirmed the key roles of complex contagion mechanisms such as memory, social reinforcement, and decay effects in information diffusion and behaviour spreading. Inspired by this fact, we here propose a new agent--based model ... More

Investigation of homogeneity and matter distribution on large scales using large quasar groupsDec 09 2014We use 12 large quasar group (LQG) samples to investigate the homogeneity of $0.5\lesssim z \lesssim 2$ Universe ($z$ denotes the redshift). We calculate the bias factor $b$ and the two-point correlation function $\xi_{{\rm LQG}}$ for such groups for ... More

Distribution flows associated with positivity preserving coercive formsAug 21 2017For a given quasi-regular positivity preserving coercive form, we construct a family of ($\sigma$-finite) distribution flows associated with the semigroup of the form. The canonical cadlag process equipped with the distribution flows behaves like a strong ... More

Deadlock Detection in Basic Models of MPI Synchronization Communication ProgramsSep 24 2007Jan 28 2008A model of MPI synchronization communication programs is presented and its three basic simplified models are also defined. A series of theorems and methods for deciding whether deadlocks will occur among the three models are given and proved strictly. ... More

Design of Differentially Private Dynamic ControllersJan 22 2019As a quantitative criterion for privacy of "mechanisms" in the form of data-generating processes, the concept of differential privacy was first proposed in computer science and has later been applied to linear dynamical systems. However, differential ... More

Upper bound of the fully entangled fractionOct 06 2008We study the fully entangled fraction of quantum states. An upper bound is obtained for arbitrary dimensional bipartite systems. This bound is shown to be exact for the case of two-qubit systems. An inequality related the fully entangled fraction of two ... More

Bounds for multipartite concurrenceMay 19 2010We study the entanglement of a multipartite quantum state. An inequality between the bipartite concurrence and the multipartite concurrence is obtained. More effective lower and upper bounds of the multipartite concurrence are obtained. By using the lower ... More

Separability and Entanglement of Quantum States Based on Covariance MatricesMay 12 2008We investigate the separability of quantum states based on covariance matrices. Separability criteria are presented for multipartite states. The lower bound of concurrence proposed in Phys. Rev. A. 75, 052320 (2007) is improved by optimizing the local ... More