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Results for "Zhi-Xiang Zhang"

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Possible correlations between the emission properties of short GRBs and their offsets from the host galaxiesJun 21 2017Short Gamma-Ray Bursts(SGRBs) are widely believed to be from mergers of binary compact objects involving at least one neutron star and hence have a broad range of spatial offsets from their host galaxies. In this work we search for possible correlations ... More
Security of decoy-state quantum key distribution with inexactly controlled sourceDec 14 2006Feb 08 2008We show the unconditional security of decoy-state method quantum cryptography with whatever intensity error pattern provided that the error is not too large. Our result immediately applies to the existing experimental data. Our result is not limitted ... More
A note on local integrability of differential systemsDec 27 2017For an $n$--dimensional local analytic differential system $\dot x=Ax+f(x)$ with $f(x)=O(|x|^2)$, the Poincar\'e nonintegrability theorem states that if the eigenvalues of $A$ are not resonant, the system does not have an analytic or a formal first integral ... More
Inverse Jacobian multipliers and Hopf bifurcation on center manifoldsJul 30 2014In this paper we consider a class of higher dimensional differential systems in $\mathbb R^n$ which have a two dimensional center manifold at the origin with a pair of pure imaginary eigenvalues. First we characterize the existence of either analytic ... More
The embedding flows of $C^\infty$ hyperbolic diffeomorphismsJul 30 2014In [{\it American J. Mathematics}, 124(2002), 107--127] we proved that for a germ of $C^\infty$ hyperbolic diffeomorphisms $F(x)=Ax+f(x)$ in $(\mathbb R^n,0)$, if $A$ has a real logarithm with its eigenvalues weakly nonresonant, then $F(x)$ can be embedded ... More
Global structure of quaternion polynomial differential equationsJul 30 2014In this paper we mainly study the global structure of the quaternion Bernoulli equations $\dot q=aq+bq^n$ for $q\in \mathbb H$ the quaternion field and also some other form of cubic quaternion differential equations. By using the Liouvillian theorem of ... More
A class of chemotaxis systems with growth source and nonlinear secretionOct 25 2015In this paper, we are concerned with a class of parabolic-elliptic chemotaxis systems encompassing the prototype $$\left\{\begin{array}{lll} &u_t = \nabla\cdot(\nabla u-\chi u\nabla v)+f(u), & x\in \Omega, t>0, \\[0.2cm] &0= \Delta v -v+u^\kappa, & x\in ... More
Generalized Migdal-Kadanoff Bond-moving Renormalization Recursion Procedure I: Symmetrical Half-length Bond Operation on Translational Invariant LatticesOct 27 2011We report in a series of papers two types of generalized Migdal-Kadanoff bond-moving renormalization group transformation recursion procedures. In this first part the symmetrical operation of half length bonds on translational invariant lattices are considered. ... More
Generalized Migdal-Kadanoff Bond-moving Renormalization Recursion Procedure II: Symmetrical Half-length Bond Operation on FractalsOct 27 2011In this second part of the series of two papers we report another type of generalized Migdal-Kadanoff bond-moving renormalization group transformation recursion procedures considering symmetrical single bond operations on fractals. The critical behavior ... More
Implications of the Tentative Association between GW150914 and a {\it Fermi}-GBM TransientFeb 14 2016Aug 11 2016The merger-driven Gamma-ray Bursts (GRBs) and their associated gravitational wave (GW) radiation, if both successfully detected, have some far-reaching implications, including for instance: (i) The statistical comparison of the physical properties of ... More
Late afterglow emission statistics: a clear link between GW170817 and bright short GRBsJan 06 2019GW170817, the first neutron star merger event detected by advanced LIGO/Virgo detectors, was associated with an underluminous short duration GRB 170817A. In this work we compare the forward shock afterglow emission of GW170817/GRB 170817A to other luminous ... More
Storing High-Dimensional Quantum States in a Cold Atomic EnsembleOct 11 2013The reversible transfer of the quantum information between a photon, an information carrier, and a quantum memory with high fidelity and reliability is the prerequisite for realizing a long-distance quantum communication and a quantum network. Encoding ... More
Electric Field Induced Patterns and their Temperature Dependence in a Bent-Core Liquid CrystalNov 30 2014Two kinds of electroconvection (EC) patterns in an ether-bridged bent-core nematic liquid crystal material (BCN), which appear in different frequency ranges, are examined and compared in this paper. One is a longitudinal pattern with the stripes parallel ... More
Exterior algebras and two conjectures on finite abelian groupsAug 20 2008Apr 13 2011Let G be a finite abelian group with |G|>1. Let a_1,...,a_k be k distinct elements of G and let b_1,...,b_k be (not necessarily distinct) elements of G, where k is a positive integer smaller than the least prime divisor of |G|. We show that there is a ... 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
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
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
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
Monogamy relations of all quantum correlation measures for multipartite quantum systemsMay 05 2019The monogamy relations of quantum correlation restrict the sharability of quantum correlations in multipartite quantum states. We show that all measures of quantum correlations satisfy some kind of monogamy relations for arbitrary multipartite quantum ... 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
Proof of a conjectural supercongruenceJan 12 2015Apr 28 2015Let $m>2$ and $q>0$ be integers with $m$ even or $q$ odd. We show the supercongruence $$\sum_{k=0}^{p-1}(-1)^{km}\binom{p/m-q}{k}^m\equiv0\pmod{p^3}.$$ for any prime $p>mq$. This confirms a conjecture of Sun.
Sums of four polygonal numbers with coefficientsAug 08 2016Oct 05 2017Let $m\ge3$ be an integer. The polygonal numbers of order $m+2$ are given by $p_{m+2}(n)=m\binom n2+n$ $(n=0,1,2,\ldots)$. A famous claim of Fermat proved by Cauchy asserts that each nonnegative integer is the sum of $m+2$ polygonal numbers of order $m+2$. ... More
Online Maximizing Weighted Throughput In A Fading ChannelApr 29 2009We consider online scheduling weighted packets with time constraints over a fading channel. Packets arrive at the transmitter in an online manner. Each packet has a value and a deadline by which it should be sent. The fade state of the channel determines ... More
A new technique for finding conservation laws of partial differential equationsSep 22 2014We propose a new technique to construct conservation laws of partial differential equations (PDEs), where the whole computations can be fully implemented on a computer. The result is obtained by proving that any adjoint symmetry of PDEs is a differential ... More
Early soft X-ray to UV emission from double neutron star mergers: implications from the long-term radio and X-ray emissions of GW 170817Dec 11 2017Jan 08 2018Recent long-term radio follow-up observations of GW 170817 reveals a simple power-law rising light curve, with a slope of $t^{0.78}$, up to 93 days after the merger. The latest X-ray detection at 109 days is also consistent with such a temporal slope. ... More
Tighter monogamy relations of quantum entanglement for multiqubit W-class statesDec 16 2017Monogamy relations characterize the distributions of entanglement in multipartite systems. We investigate monogamy relations for multiqubit generalized W-class states. We present new analytical monogamy inequalities for the concurrence of assistance, ... More
Identification and classification of TCM syndrome types among patients with vascular mild cognitive impairment using latent tree analysisJan 26 2016Feb 24 2016Objective: To treat patients with vascular mild cognitive impairment (VMCI) using TCM, it is necessary to classify the patients into TCM syndrome types and to apply different treatments to different types. We investigate how to properly carry out the ... More
An silicon nanocrystal laserSep 30 2017Silicon lasers have been the most challenging element for the monolithic integrated Si photonics. Here we report the first successful all-Si laser at room temperature based on silicon nanocrystals (Si NCs) with high optical gains. The active Si NC layer ... More
Direct Measurement of the Two-dimensional Spatial Quantum Wavefunction via Strong MeasurementsNov 05 2018Wavefunction is the foundation of quantum theory, which is assumed to give a complete description of a quantum system. For a long time, wavefunction is introduced as an abstract element of the theory and there lacks effective ways to measure it directly. ... More
Structures and dynamics of glass-forming colloidal liquids under spherical confinementDec 09 2015Mar 02 2016Recent theories predict that when a supercooled liquid approaches the glass transition, particle clusters with a special "amorphous order" nucleate within the liquid, which lead to static correlations dictating the dramatic slowdown of liquid relaxation. ... More
Ladder Chains: A Variation of Random WalksDec 07 2018The authors propose a new variation of random walks called ladder chains $L(r,s,p)$. We extend concepts such as ruin probability, hitting time, transience and recurrence of random walks to ladder chain. Take $L(2,2,p)$ for instance, we find the linear ... More
Existence of Metrics with Prescribed Scalar Curvature on the Volume Element Preserving DeformationDec 22 2006In this paper,we obtain two results on closed Reimainnian manifold $M\times [0,T]$.When $T$ is small enough,to any prescribed scalar curvature, the existence and uniqueness of metrics are obtained on the volume element preserving deformation.When $T$ ... More
Long-wavelength fluctuations and static correlations in quasi-2D colloidal suspensionsApr 29 2019Dimensionality strongly affects thermal fluctuations and critical dynamics of equilibrium systems. These influences persist in amorphous systems going through the nonequilibrium glass transition. Here, we experimentally study the glass transition of quasi-2D ... More
Central Configurations Formed By Two Twisted Regular PolygonsMay 19 2014In this paper, we study the necessary conditions and sufficient conditions for the central configurations formed by two twisted regular polygons (one N-regular polygon and one L-regular polygon). We wish to extend the results of the symmetrical central ... More
Global dynamics of planar quasi-homogeneous differential systemsAug 11 2017In this paper we provide a new method to study global dynamics of planar quasi--homogeneous differential systems. We first prove that all planar quasi--homogeneous polynomial differential systems can be translated into homogeneous differential systems ... More
Action Minimizing Solutions of The One-Dimensional $N$-Body Problem With Equal MassesJan 06 2014Feb 14 2015When we use variational methods to study the Newtonian $N$-body problem, the main problem is how to avoid collisions. C.Marchal got a remarkable result, that is, a path minimizing the Lagrangian action functional between two given configurations is always ... More
Saari's Conjecture for Elliptical Type $N$-Body Problem and An ApplicationAug 11 2013Nov 18 2013By using an arithmetic fact, we will firstly prove Saari's conjecture in a particular case, which is called the Elliptical Type N-Body Problem, and then we apply it to prove that the variational minimal solution of the planar Newtonian N-body problem ... More
Analytic normalization of analytically integrable differential systems near a periodic orbitJul 30 2014For an analytic differential system in $\mathbb R^n$ with a periodic orbit, we will prove that if the system is analytically integrable around the periodic orbit, i.e. it has $n-1$ functionally independent analytic first integrals defined in a neighborhood ... More
The LAMOST Survey of Background Quasars in the Vicinity Fields of the M 31 and M 33 - III. Results from the 2013 Regular SurveyMay 29 2015In this work, we report new quasars discovered in the vicinity fields of the Andromeda (M31) and Triangulum (M33) galaxies with the LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope, also named Guoshoujing Telescope) during the 2013 observational ... More
Experimental Long-Distance Decoy-State Quantum Key Distribution Based On Polarization EncodingJul 19 2006Jan 09 2007We demonstrate the decoy-state quantum key distribution (QKD) with one-way quantum communication in polarization space over 102km. Further, we simplify the experimental setup and use only one detector to implement the one-way decoy-state QKD over 75km, ... More
Quantum Storage of Orbital Angular Momentum Entanglement in an Atomic EnsembleApr 02 2014Constructing a quantum memory for a photonic entanglement is vital for realizing quantum communication and network. Besides enabling the realization of high channel capacity communication, entangled photons of high-dimensional space are of great interest ... More
GRB 111005A at Z = 0.0133 and the Prospect of Establishing Long-short GRB/GW AssociationOct 13 2017Jan 10 2018GRB 111005A, one long duration gamma-ray burst (GRB) occurred within a metal-rich environment that lacks massive stars with $M_{\rm ZAMS}\geq 15M_\odot$, is not coincident with supernova emission down to stringent limit and thus should be classified as ... More
Experimentally Robust Self-testing for Bipartite and Tripartite Entangled StatesApr 04 2018Self-testing refers to a method with which a classical user can certify the state and measurements of quantum systems in a device-independent way. Especially, the self-testing of entangled states is of great importance in quantum information process. ... More
$ρ$ Meson Decays of Heavy Hybrid MesonsJan 13 2015Mar 16 2016We calculate the $\rho$ meson couplings between the heavy hybrid doublets H^h/S^h/M^h/T^h and the ordinary q\bar{Q} doublets in the framework of the light-cone QCD sum rule. The sum rules obtained rely mildly on the Borel parameters in their working regions. ... More
Binomial coefficients and the ring of p-adic integersDec 16 2008Jan 25 2011Let k>1 be an integer and let p be a prime. We show that if $p^a\le k<2p^a$ or $k=p^aq+1$ (with 2q<p) for some a=1,2,..., then the set {\binom{n}{k}: n=0,1,2,...} is dense in the ring Z_p of p-adic integers, i.e., it contains a complete system of residues ... More
Analysis of Spreading Speeds with an Application to Cellular Neural NetworksAug 07 2017In this paper, we focus on some properties of the spreading speeds which can be estimated by linear operators approach, such as the sign, the continuity and a limiting case which admits no spreading phenomenon. These theoretical results are well applied ... More
Unprecedentedly Wide Curie-Temperature Windows as Phase-Transition Design Platform for Tunable Magneto-Multifunctional MaterialsJul 21 2015A series of unprecedentedly wide Curie-temperature windows (CTWs) between 40 and 450 K are realized by employing the isostructural alloying principle for the strongly coupled magnetostructural phase transitions in a single host system. The CTWs provide ... More
Quasars in the Galactic Anti-Center Area from the LAMOST DR3Feb 06 2017We present a sample of quasars discovered in the area of Galactic Anti-Center (GAC) of $150^{\circ} \leq l \leq 210^{\circ}$ and $|b| \leq 30^{\circ}$, based on the LAMOST Data Release 3 (DR3). The sample contains 151 spectroscopically confirmed quasars. ... More
Stability and Generalization of Graph Convolutional Neural NetworksMay 03 2019Inspired by convolutional neural networks on 1D and 2D data, graph convolutional neural networks (GCNNs) have been developed for various learning tasks on graph data, and have shown superior performance on real-world datasets. Despite their success, there ... 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
Stochastic Approximation of Smooth and Strongly Convex Functions: Beyond the $O(1/T)$ Convergence RateJan 27 2019Stochastic approximation (SA) is a classical approach for stochastic convex optimization. Previous studies have demonstrated that the convergence rate of SA can be improved by introducing either smoothness or strong convexity condition. In this paper, ... More
Polygamy relations of multipartite systemsFeb 20 2019We investigate the polygamy relations of multipartite quantum states. General polygamy inequalities are given in the $\alpha$th $(\alpha\geq 2)$ power of concurrence of assistance, $\beta$th $(\beta \geq1)$ power of entanglement of assistance, and the ... More
Tighter monogamy relations in multipartite systemsMar 30 2018Monogamy relations characterize the distributions of entanglement in multipartite systems. We investigate monogamy relations related to the concurrence C, the entanglement of formation E, negativity Nc and Tsallis-q entanglement Tq. Monogamy relations ... More
Categorizing resonances X(1835), X(2120) and X(2370) in the pseudoscalar meson familyApr 15 2011May 20 2011Inspired by the newly observed three resonances X(1835), X(2120) and X(2370), in this work we systematically study the two-body strong decays and double pion decays of $\eta(1295)/\eta(1475)$, $\eta(1760)/X(1835)$ and $X(2120)/X(2370)$ by categorizing ... More
Variational Symplectic Particle-in-cell Simulation of Nonlinear Mode Conversion from Extraordinary waves to Bernstein WavesJun 12 2015Sep 29 2015In this paper, the nonlinear mode conversion of extraordinary waves in nonuniform magnetized plasmas is studied using the variational symplectic particle-in-cell simulation. The accuracy of the nonlinear simulation is guaranteed by the long-term accuracy ... More
Geometric field theory and weak Euler-Lagrange equation for classical relativistic particle-field systemsOct 17 2016Nov 21 2017A manifestly covariant, or geometric, field theory for relativistic classical particle-field system is developed. The connection between space-time symmetry and energy-momentum conservation laws for the system is established geometrically without splitting ... More
Quantifying quantum coherence based on the generalized $α-z-$relative R$\acute{e}$nyi entropyMay 06 2019We present a family of coherence quantifiers based on the generalized $\alpha-z-$relative R$\acute{e}$nyi entropy. These quantifiers satisfy all the standard criteria for well-defined measures of coherence, and include some existing coherence measures ... More
$\bar{K}Λ$ molecular explanation to the newly observed $Ξ(1620)^0$Jun 13 2019The newly observed $\Xi(1620)^0$ by the Belle Collaboration inspires our interest in performing a systematic study on the interaction of an anti-strange meson $(\bar{K}^{(*)})$ with a strange or doubly strange ground octet baryon $\mathcal{B}$ ($\Lambda$, ... More
Low-energy $D^{*+}D^0_1$ Scattering and the Resonance-like Structure $Z^+(4430)$May 06 2009Low-energy scattering of $D^*$ and $D_1$ meson are studied using quenched lattice QCD with improved lattice actions on anisotropic lattices. The calculation is performed within L\"uscher's finite-size formalism which establishes the relation between the ... More
The single-mode description of the integer quantum Hall state with dipole-dipole interactionApr 10 2013Jan 31 2014A topological phase can often be represented by a corresponding wavefunction (exact eigenstate of a model Hamiltonian) that has a higher underlying symmetry than necessary. When the symmetry is explicitly broken in the Hamiltonian, the model wavefunction ... More
Improved monogamy relations with concurrence of assistance and negativity of assistance for multiqubit W-class statesJul 18 2018Monogamy relations characterize the distributions of entanglement in multipartite systems. We investigate the monogamy relations satisfied by the concurrence of assistance and the negativity of assistance for multiqubit generalized $W$-class states. Analytical ... More
Simple protocol for secure decoy-state quantum key distribution with a loosely controlled sourceSep 18 2006Jan 16 2008The method of decoy-state quantum key distribution (QKD) requests different intensities of light pulses. Existing theory has assumed exact control of intensities. Here we propose a simple protocol which is secure and efficient even there are errors in ... More
Strong LHCb evidence for supporting the existence of hidden-charm molecular pentaquarksMar 26 2019In 26 March 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of new pentaquarks, namely $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. Within the framework of one-boson-exchange (OBE) model, our study indicates ... More
Hadronic molecules with both open charm and bottomMar 06 2012Apr 30 2012With the one-boson-exchange model, we study the interaction between the S-wave $D^{(*)}/D^{(*)}_s$ meson and S-wave $B^{(*)}/B^{(*)}_s$ meson considering the S-D mixing effect. Our calculation indicates that there may exist the $B_c$-like molecular states. ... More
A systematic study on the binding energy of $Λ$ hypernucleiMar 04 2009Jul 30 2009In this paper, we calculated the binding energy per baryon of the $\Lambda$ hypernuclei systemically, using the relativistic mean field theory (RMF) in a statistic frame. Some resemble properties are found among most of the hypernuclei found in experiments. ... More
On the Possible Variations of the Hubble Constant with DistanceApr 12 1996Current measurements of the Hubble constant $H_0$ on scale less than $\sim100$ Mpc appear to be controversial, while the observations made at high redshift seem to provide a relatively low value. On the other hand, the Hubble expansion is driven by the ... More
The Lx-T and Lx-sigma Relationships for Galaxy Clusters RevisitedMay 10 1999The relationships between the X-ray determined bolometric luminosity Lx, the temperature T of the intracluster gas, and the optical measured velocity dispersion sigma of the cluster galaxies are updated for galaxy clusters using the largest sample of ... More
Scale Invariance of Rich Cluster Abundance: A Possible Test for Models of Structure FormationJun 26 1998We investigate the dependence of cluster abundance $n(>M,r_{cl})$, i.e., the number density of clusters with mass larger than $M$ within radius $r_{cl}$, on scale parameter $r_{cl}$. Using numerical simulations of clusters in the CDM cosmogonic theories, ... More
Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarksMar 26 2019Mar 28 2019On March 26th, 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of three new pentaquarks, namely $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$, which are consistent with the loosely bound molecular hidden-charm ... More
Triangle-like inequalities related to coherence and entanglement negativityNov 20 2018Quantum coherence and entanglement are two key features in quantum mechanics and play important roles in quantum information processing and quantum computation. We provide a general triangle-like inequality satisfied by the $l_1$-norm measure of coherence ... More
Relaxed 2-D Principal Component Analysis by $L_p$ Norm for Face RecognitionMay 15 2019A relaxed two dimensional principal component analysis (R2DPCA) approach is proposed for face recognition. Different to the 2DPCA, 2DPCA-$L_1$ and G2DPCA, the R2DPCA utilizes the label information (if known) of training samples to calculate a relaxation ... More
Room-temperature chiral charge pumping in Dirac semimetalsApr 29 2015Nov 01 2016Chiral anomaly, a non-conservation of chiral charge pumped by the topological nontrivial gauge fields, has been predicted to exist in Weyl semimetals. However, until now, the experimental signature of this effect exclusively relies on the observation ... More
Reverberation mapping of narrow-line Seyfert 1 galaxy I Zwicky 1: black hole massApr 12 2019We report results of the first reverberation mapping campaign of I Zwicky 1 during $2014$-$2016$, which showed unambiguous reverberations of the broad H$\beta$ line emission to the varying optical continuum. From analysis using several methods, we obtain ... More
A Method of Alignment of the Plastic Scintillator Detector of DAMPEAug 17 2018Aug 20 2018The Plastic Scintillator Detector (PSD) of the DArk Matter Particle Explorer (DAMPE) is designed to measure cosmic ray charge (Z) and to act as a veto detector for gamma-ray identification. In order to fully exploit the charge identification potential ... More
$Z_b(10610)^\pm$ and $Z_b(10650)^\pm$ as the $B^*\bar{B}$ and $B^*\bar{B}^{*}$ molecular statesJun 15 2011In the framework of the one-boson-exchange model, we have studied the interaction of the $B^*\bar{B}$ and $B^*\bar{B}^{*}$ system. After considering the S-wave and D-wave mixing, we notice that both $Z_b(10610)^\pm$ and $Z_b(10650)^\pm$ can be interpreted ... More
Review on Requirements Modeling and Analysis for Self-Adaptive Systems: A Ten-Year PerspectiveApr 03 2017Context: Over the last decade, software researchers and engineers have developed a vast body of methodologies and technologies in requirements engineering for self-adaptive systems. Although existing studies have explored various aspects of this field, ... More
Studies of LL-type 500MHz 5-cell superconducting cavity at SINAPJul 11 2014Aug 22 2014A low loss (LL) type 500 MHz 5-cell superconducting niobium prototype cavity with large beam aperture has been developed successfully including the optimization, the deep drawing and electron beam welding, the surface treatment and the vertical testing. ... More
Image Stitching by Line-guided Local Warping with Global Similarity ConstraintFeb 25 2017Oct 30 2017Low-textured image stitching remains a challenging problem. It is difficult to achieve good alignment and it is easy to break image structures due to insufficient and unreliable point correspondences. Moreover, because of the viewpoint variations between ... More
An efficient quantum circuits optimizing scheme compared with QISKitJul 04 2018Recently, the development of quantum chips has made great progress-- the number of qubits is increasing and the fidelity is getting higher. However, qubits of these chips are not always fully connected, which sets additional barriers for implementing ... More
GW170817/GRB 170817A/AT2017gfo association: some implications for physics and astrophysicsOct 16 2017Dec 04 2017On 17 August 2017, a gravitational wave event (GW170817) and an associated short gamma-ray burst (GRB 170817A) from a binary neutron star merger had been detected. The followup optical/infrared observations also identified the macronova/kilonova emission ... More
Kinematics of the Broad-line Region of 3C 273 from a Ten-year Reverberation Mapping CampaignNov 09 2018Mar 13 2019Despite many decades of study, the kinematics of the broad-line region of 3C~273 are still poorly understood. We report a new, high signal-to-noise, reverberation mapping campaign carried out from November 2008 to March 2018 that allows the determination ... More
A large area plastic scintillation detector with 4-corner-readoutAug 23 2015Aug 26 2015A 760 $\times$ 760 $\times$ 30 mm$^3$ plastic scintillation detector viewed by photomultiplier tubes (PMTs) from four corners has been developed, and the detector has been tested with cosmic rays and $\gamma$ rays. A position-independent effective time ... More
Spectroscopic Indication for a Centi-parsec Supermassive Black Hole Binary in the Galactic Center of NGC 5548Feb 16 2016Mar 04 2016As a natural consequence of cosmological hierarchical structure formation, sub-parsec supermassive black hole binaries (SMBHBs) should be common in galaxies but thus far have eluded spectroscopic identification. Based on four decades of optical spectroscopic ... More
Radiative transitions in charmonium from $N_f=2$ twisted mass lattice QCDApr 14 2011We present a study for charmonium radiative transitions: $J/\psi\rightarrow\eta_c\gamma$, $\chi_{c0}\rightarrow J/\Psi\gamma$ and $h_c\rightarrow\eta_c\gamma$ using $N_f=2$ twisted mass lattice QCD gauge configurations. The single-quark vector form factors ... More
Nearly Tri-bimaximal Neutrino Mixing and CP Violation from mu-tau Symmetry BreakingJul 09 2006Aug 14 2006Assuming the Majorana nature of massive neutrinos, we generalize the Friedberg-Lee neutrino mass model to include CP violation in the neutrino mass matrix $M^{}_\nu$. We show that a favorable neutrino mixing pattern (with $\theta^{}_{12} \approx 35.3^\circ$, ... More
Flavor Quantum Dots and Artificial Quark Model in Transition Metal DichalcogenidesMar 05 2019We show that the triply degenerate Q valleys in few-layer transition metal dichalcogenides provide a unique platform for exploring the rare flavor SU(3) symmetry in quantum dot geometry. The single and double dots are reminiscent of the quark model and ... More
Visibility of ultra-cold Bose system in triangular optical latticesMay 31 2012Jun 05 2012In this paper, by treating the hopping parameter in Bose-Hubbard model as a perturbation, with the help of the re-summed Green's function method and cumulants expansion, the momentum distribution function of the ultra-cold Bose system in triangular optical ... More
Quantum phase transitions of ultra-cold Bose system in non-rectangular optical latticesDec 18 2011In this paper, we investigate systematically the Mott-insulator-Superfluid quantum phase transitions for ultracold scalar bosons in triangular, hexagonal, as well as Kagom\'e optical lattices. With the help of field-theoretical effective potential, by ... More
A logarithmic generalization of tensor product theory for modules for a vertex operator algebraNov 14 2003Sep 28 2006We describe a logarithmic tensor product theory for certain module categories for a ``conformal vertex algebra.'' In this theory, which is a natural, although intricate, generalization of earlier work of Huang and Lepowsky, we do not require the module ... More
Equivalent spin-orbit interaction in two-polariton Jaynes-Cummings-Hubbard modelSep 25 2014A hybrid quantum system combines two or more distinct quantum components, exhibiting features not seen in these individual systems. In this work, we study the one-dimensional Jaynes-Cummings- Hubbard model in the two-excitation subspace. We find that ... More
Majorana flat band edge modes of topological gapless phase in 2D Kitaev square latticeNov 19 2018We study a Kitaev model on a square lattice, which describes topologically trivial superconductor when gap opens, while supports topological gapless phase when gap closes. The degeneracy points are characterized by two vortices in momentum space, with ... More
Complexity of Substitutive Sequences - Calculation of the Complexities of Substitutive Sequences Over a Binary AlphabetJul 11 2015We consider the complexities of substitutive sequences over a binary alphabet. By studying various types of special words, we show that, knowing some initial values, its complexity can be completely formulated via a recurrence formula determined by the ... More
On Designs of Full Diversity Space-Time Block Codes for Two-User MIMO Interference ChannelsSep 26 2012In this paper, a design criterion for space-time block codes (STBC) is proposed for two-user MIMO interference channels when a group zero-forcing (ZF) algorithm is applied at each receiver to eliminate the inter-user interference. Based on the design ... More
High-Rate and Full-Diversity Space-Time Block Codes with Low Complexity Partial Interference Cancellation Group DecodingApr 16 2010In this paper, we propose a systematic design of space-time block codes (STBC) which can achieve high rate and full diversity when the partial interference cancellation (PIC) group decoding is used at receivers. The proposed codes can be applied to any ... More
Sharp global regularity for the 2+1-dimensional equivariant Faddeev modelJul 17 2013The aim of this article is to prove that for the 2+1-dimensional equivariant Faddeev model, which is a quasilinear generalization of the corresponding nonlinear sigma model, small initial data in critical Besov spaces evolve into global solutions which ... More
Logarithmic tensor category theory, IV: Constructions of tensor product bifunctors and the compatibility conditionsDec 19 2010May 11 2012This is the fourth part in a series of papers in which we introduce and develop a natural, general tensor category theory for suitable module categories for a vertex (operator) algebra. In this paper (Part IV), we give constructions of the P(z)- and Q(z)-tensor ... More
Logarithmic tensor category theory, V: Convergence condition for intertwining maps and the corresponding compatibility conditionDec 19 2010May 11 2012This is the fifth part in a series of papers in which we introduce and develop a natural, general tensor category theory for suitable module categories for a vertex (operator) algebra. In this paper (Part V), we study products and iterates of intertwining ... More
Flavor Symmetry and Ferroelectric Nematics in Transition Metal DichalcogenidesMay 16 2018Recent magneto-transport experiments have provided compelling evidence for the presence of an energetically isolated threefold Q-valley degeneracy in few-layer transition metal dichalcogenides. We study the flavor SU(3) symmetry breaking when each Landau ... More
Photon Berry phases, Instantons, Quantum chaos and quantum analog of Kolmogorov-Arnold-Moser (KAM) theorem in Dicke modelsMar 06 2019The quantum analog of Lyapunov exponent has been discussed in the Sachdev-Ye-Kitaev (SYK) model and its various generalizations. Here we investigate possible quantum analog of Kolmogorov-Arnold-Moser (KAM) theorem in the $ U(1)/Z_2 $ Dicke model which ... More
Secant planes of a general curve via degenerationsJan 18 2019Feb 23 2019We study linear series on a general curve of genus g, whose images are exceptional with respect to their secant planes. Each such exceptional secant plane is algebraically encoded by an included linear series, whose number of base points computes the ... More