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| 1 | Dynamic generation of entangling wave packets in XY spin system with decaying long-range couplings显示文摘The dynamic generation of spin entanglement between two distant sites in a XY model with 1/r 2 decay long-range couplings was studied.Due to the linear dispersion relationε(k)~|k|of magnons in such a model,a well-located spin state can be dynamically split into two moving entangled local wave packets without changing their shapes.Interestingly,when such two wave packets meet at the diametrically opposite site after the fast periodτ=Nπ/J,the initial well-located state is completely recurrent.Numerical calculation was performed to confirm the analytical result even if the ring system of sizes N up to several thousands is considered.The truncation approximation for the coupling strengths was also studied.Numerical simulation shows that the above conclusions still hold even if the range of the coupling strength is truncated to a relatively short scale compared with the size of the spin system. | YANG Shuo SONG Zhi SUN ChangPu | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，1： | 4 |
| 2 | Thermodynamic witness of quantum probing显示文摘The thermodynamic influence of quantum probing on an object is studied.Here,quantum probing is understood to be a pre-measurement based on a non-demolition interaction,which records some information of the probed object but does not change its energy state when both the probing apparatus and the probed object are isolated from the environment.It is argued that when the probing apparatus and the probed object are immersed in the same equilibrium environment,the probing can affect the effective temperature of the object or induce a quantum isothermal process for the object to transfer its energy.This thermodynamic feature can be regarded as a witness of quantum probing. | DONG Hui LIU XuFeng SUN ChangPu | 2010 | Chinese Science Bulletin2010，55，29： | 3 |
| 3 | Dynamics of quantum zeno and anti-zeno efects in an open system显示文摘We provide a general dynamical approach for the quantum Zeno and anti-Zeno efects in an open quantum system under repeated non-demolition measurements.In our approach the repeated measurements are described by a general dynamical model without the wave function collapse postulation.Based on that model,we further study both the short-time and long-time evolutions of the open quantum system under repeated non-demolition measurements,and derive the measurement-modified decay rates of the excited state.In the cases with frequent ideal measurements at zero-temperature,we re-obtain the same decay rate as that from the wave function collapse postulation(Nature,2000,405:546).The correction to the ideal decay rate is also obtained under the non-ideal measurements.Especially,we find that the quantum Zeno and anti-Zeno efects are possibly enhanced by the non-ideal natures of measurements.For the open system under measurements with arbitrary period,we generally derive the rate equation for the long-time evolution for the cases with arbitrary temperature and noise spectrum,and show that in the long-time evolution the noise spectrum is efectively tuned by the repeated measurements.Our approach is also able to describe the quantum Zeno and anti-Zeno efects given by the phase modulation pulses,as well as the relevant quantum control schemes. | ZHANG Peng AI Qing LI Yong XU DaZhi SUN ChangPu | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，2： | 2 |
| 4 | Controlling single-photon transport in waveguides with finite crosssection显示文摘 | Huang Jinfeng Shi Tao Sun Changpu | 2013 | Phys Rev2013，88，01： | 1 |
| 5 | Waveguide quantum electrodynamics: Controllable channel from quantum interference显示文摘 | Li Qiong Zhou Lan Sun Changpu | 2014 | Phys Rev2014，89，06： | 1 |
| 6 | Evolution of the wave function in a dissipative system显示文摘 | Yu Lihua Sun Changpu | 2000 | Phys Rev2000，49，1： | 1 |
| 7 | Evolution of the wave function in a dissipative system显示文摘 | YU Lihua SUN Changpu | 1994 | Phys Rev A1994，49，1： | 1 |
| 8 | Evolution of the wave function in a dissipative system显示文摘 | SUN Changpu YU Lihao | 1994 | Phys Rev1994，49，： | 1 |
| 9 | Exact dynamics of a quantum dissipative system in a constant external field显示文摘 | YU Lihua SUN Changpu | 1995 | Phys Rev1995，1，： | 1 |
| 10 | Sudden vanishing of spin squeezing under decoherence显示文摘 | Wang Xiaoguang Adam Miranowicz Liu Yuxi Sun Changpu Franco Nori | 2010 | Phys Rev A2010，81，02： | 1 |
| 11 | Spontaneous decoherence of coupled harmonic oscillators confined in a ring显示文摘We study the spontaneous decoherence of coupled harmonic oscillators confined in a ring container, where the nearest-neighbor harmonic potentials are taken into consideration. Without any external symmetry-breaking field or surrounding environment, the quantum superposition state prepared in the relative degrees of freedom gradually loses its quantum coherence spontaneously.This spontaneous decoherence is interpreted by the gauge couplings between the center-of-mass and the relative degrees of freedoms, which actually originate from the symmetries of the ring geometry and the corresponding nontrivial boundary conditions.In particular, such spontaneous decoherence does not occur at all at the thermodynamic limit because the nontrivial boundary conditions become the trivial Born-von Karman boundary conditions when the perimeter of the ring container tends to infinity.Our investigation shows that a thermal macroscopic object with certain symmetries has a chance for its quantum properties to degrade even without applying an external symmetry-breaking field or surrounding environment. | ZhiRui Gong ZhenWei Zhang DaZhi Xu Nan Zhao ChangPu Sun | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，4： | 1 |
| 12 | Representations of quantum matrix algebra Mq (2) and its q-boson realization 显示文摘 | GE Molin LIU Xufeng SUN Changpu | 1992 | J Math Phys1992，33，7： | 1 |
| 13 | Fermion System with Quantum Group Symmetry and Usual Fermion Realizations of S1_(q)(2)显示文摘The usual fermion realizations of quantum algebra S1_(q)(2) defining higher-dimensional representations are built in this letter.Using them,we construct a usual fermion system with quantum group symmetry of S1_(q)(2) as a q-deformation of the pairing correlation model in many-body problems.Its energy spectra are exactly solved out from the representation theory of S1_(q)(2). | SUN Changpu LI Jianming | 1992 | Chinese Physics Letters1992，9，12： | 0 |
| 14 | Deflection of an Atomic Beam in a Large Period Quantized Standing Light Wave显示文摘By using the Wei-Norman's method,the deflection of an atomic beam with a large period quantized standing light wave is analyzed for the case with two-level atom and single-mode cavity field.It is concluded that after passing through the standing light wave in cavity,the atomic beam is split into infinite beams symmetrically,and each momentum shift for a split component is proportional to the interaction time.It is also shown that the output momentum distribution of atoms is sensitive to the statistical properties of the cavity field. | WANG Xiaoguang SUN Changpu | 1994 | Chinese Physics Letters1994，11，12： | 0 |
| 15 | A quantum solution to Gibbs paradox with few particles显示文摘We present a fully quantum solution to the Gibbs paradox (GP) with an illustration based on a gedanken experiment with two particles trapped in an infinite potential well. The well is divided into two cells by a solid wall, which could be removed for mixing the particles. For the initial thermal state with correct two-particle wavefunction according to their quantum statistics, the exact calculations show the entropy changes are the same for boson, fermion and non-identical particles. With the observation that the initial unmixed state of identical particles in the conventional presentations actually is not of a thermal equilibrium, our analysis reveals the quantum origin of the paradox, and confirms Jaynes' observation that entropy increase in Gibbs mixing is only due to the including more observables. To further show up the subtle role of the quantum mechanism in the GP, we study the different finite size effect on the entropy change and show the work performed in the mixing process is different for various types of particles. | DONG Hui CAI ChengYun SUN ChangPu | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，10： | 0 |
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