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Aharonov-Bohm-Type Electron Interference in a Two-Mode Squeezed Vacuum Field

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Chinese Physics Letters 1998年第6期15卷 393-394页

作者： shao bin zou jian Department of Applied Physics Beijing Institute of TechnologyBeijing 100081

Electron interference related to Aharonov-Bohm effect in the presence of the two-mode quantized radiation field is *** of the temporal behavior of electron interference are *** is shown that for the two-mode squeezed vacuum field the time evolution of the intensity of electron interference can exhibit very interesting periodic spontaneous collapse and revival(CR).In addition,the relation between CR and the quantum fluctuation in electron interference is also discussed.

关键词： Electron vacuum quantum

Periodic Revivals of Squeezing in a Mesoscopic Josephson Junction

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Chinese Physics Letters 1999年第6期16卷 449-451页

作者： zou jian shao bin Department of Applied Physics Beijing Institute of TechnologyBeijing 100081

The fraction between a mesoscopic Josephson junction and a quantized electromagnetic field is discussed quantum *** the external field approximation,it is shown that if the Held is prepared in a coherent state and the... 详细信息

关键词： Josephson Periodic initially

Entropy Exchange and Entanglement in Superconducting Charge Qubit Inside a Resonant Cavity with Intrinsic Decoherence

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Communications in Theoretical Physics 2008年第6期49卷 1463-1467页

作者： ZHANG jian shao bin zou jian Department of Physics Beijing Institute of Technology Beijing 100081 China

By considering the intrinsic decoherence effect, we investigate the entropy exchange and entanglement in the interacting system of a superconducting charge qubit coupled to a single-mode optical cavity. We found that although the intrinsic decoherence leads to an irreversible evolution of the interacting system due to a suppression of coherent quantum features through the decay of off-diagonal matrix elements of the density operator, and has an apparently influence on the partial entropies of the two-component subsystems, it dose not destroy entropy exchange behavior. In addition, the lower bound of the concurrence, as the measure of entanglement of the coupling system, is calculated. It is shown that the evolution of entanglement is sensitive to the change of the intrinsic decoherence.

关键词： intrinsic decoherence entropy exchange entanglement the lower bound of concurrence

Entanglement Transfer from Two-Mode Squeezed Vacuum State Field to Two Spatially Separated Atoms in Two-Photon Processes

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Communications in Theoretical Physics 2008年第5期49卷 1182-1186页

作者： CUI Hui-Ping zou jian li jian shao bin Department of Physics School of Science Beijing Institute of Technology Beijing 100081 China

We investigate the influence of the Stark shift on the entanglement transfer from the two-mode squeezed vacuum state field to two spatially separated atoms in two-photon processes. Our results show that the Stark shift plays an important role in such entanglement transfer. We find that when the Stark shift parameter r is small, the degree of entanglement between the two atoms increases with the increasing of the squeezing parameter ξ first, and after achieving its maximal value, the degree of entanglement will decrease to zero with the increasing of ξ; while for big r, E will increase with the increasing of ξ.

关键词： entanglement transfer two-mode squeezed vacuum state two-photon JCM

Generation of Entanglement Between Two Noninteracting Qubits via Interaction with Nonclassical Radiation Field

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Communications in Theoretical Physics 2005年第2X期44卷 259-268页

作者： zou jian CAI Jin-Fang shao bin li Qian-Shu Department of Physics Beijing Institute of Technology Beijing 100081 China Department of Chemistry Beijing Institute of Technology Beijing 100081 China

We study the interaction between a single-mode quantized field and a quantum system composed of two qubits. We suppose that two qubits initially be prepared in the mixed and separable state, and study how entanglement between two qubits arises in the course of evolution according to the Jaynes-Cummings type interaction with nonclassical radiation field. We also investigate the relation between entanglement and purity of qubit subsystem. We show that different photon statistics have different effects on the dynamical behavior of the qubit subsystem. When the qubits are initially prepared in the maximally mixed and separable state, for coherent state field we cannot find entanglement between two qubits; for squeezed state field entanglement between two qubits exists in several short period of time; for even and odd coherent state fields of large photon number, the dynamical behavior of the entanglement between two qubits shows collapse and revival phenomenon. For odd coherent state field of small photon number, the entanglement with both qubits initially prepared in maximally mixed state can be stronger than that with both qubits initially prepared in pure states. For fields of small photon number, the entanglement strongly depends on the states they are initially prepared in. For coherent state field, and odd and even coherent state fields of large photon number, the entanglement only depends on the purity of the initial state of qubit subsystem. We also show that during the evolution the unentangled state may be purer than the entangled state, and the maximum degree of entanglement may not occur at the time when the qubit subsystem is in the purist state.

关键词： entanglement mixed state purity nonclassical state field

Influence of Intrinsic Decoherence on Entanglement in Two-Qubit Quantum Heisenberg XYZ Chain

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Communications in Theoretical Physics 2005年第2X期44卷 255-258页

作者： shao bin ZENG Tian-Hai zou jian Department of Physics Beijing Institute of Technology Beijing 100081 China

Taking the intrinsic decoherence effect into account, we investigate the time evolution of entanglement for two-qubit XYZ Heisenberg model in an external uniform magnetic field. Concurrence, the measurement of entanglement,is calculated. We show how the intrinsic decoherence modifies the time evolution of the entanglement and find that at short-time case, concurrence is oscillating as increasing magnetic field, which implies that entanglement may be enhanced or weakened in some time regions.

关键词： entanglement intrinsic decoherence Heisenberg chain

Entanglement of Non-symmetric Two Atomic Qubits Induced by a Coherent State Field

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Communications in Theoretical Physics 2006年第1期45卷 67-70页

作者： li Jun-Gang zou jian CAI Jin-Fang shao bin Department of Physics School of Science Beijing Institute of Technology Beijing 100081 China

The entanglement of two atomic qubits, which are coupled to a coherent state field with different couplings, is studied. The dynamical evolution of the concurrence, which measures the degree of the entanglement between the two qubits, is plotted versus the scaled time gt. It is found that the two qubits can be entangled by the coherent state field even when they are initially prepared in the most mixed state, and for very weak field, the most mixed state can be; more easily entangled than some pure states. It is also found that the entanglement between the qubits sensitively depends on the relative difference of the atomic couplings and the mean photon number of the field.

关键词： entanglement mixed state coherent state field

Superposition of Coherent States in a Mesoscopic Josephson Junction with Dissipation

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Communications in Theoretical Physics 2001年第10期36卷 473-476页

作者： zou jian shao bin SU Wen-Yong Department of Applied Physics Beijing Institute of Technology Beijing 100081 China Department of Applied Physics Beijing Institute of Technology Beijing 100081 China Department of Applied Physics Beijing Institute of Technology Beijing 100081 China

A mesoscopic Josephson junction with dissipation is considered. Usually the dissipation in the system is described as a consequence of its coupling to a reservoir. By solving the master equation we show that the state... 详细信息

关键词： mesoscopic Josephson junction, superposition of coherent states, dissipation

Entanglement Transfer Between Cavity Fields and Excitons in a Driven Quantum Dot System

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Communications in Theoretical Physics 2007年第4X期48卷 645-648页

作者： ZENG Tian-Hai shao bin zou jian Department of PhysiCs Beijing Institute of Technology Beijing 100081 China

We investigate entanglement transfer from two separate cavities to the excitons in two quantum dots separately placed in the two cavities. The cavity fields and the excitons are treated as two continuous-variable （CV） subsystems. The time-dependent characteristic functions in the Wigner representation for the two subsystems are analytically obtained. Under the conditions that one of the two CV subsystems is initially prepared in a two-mode squeezed vacuum state and the other in its lowest energy state, we show that the entanglement reciprocation between the cavity fields and the excitons is realizable.

关键词： entanglement transfer quantum dot logarithmic negativity