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continuous-variable entanglement Generation from a Four-State Atom under Raman Excitation

Communications in Theoretical Physics 2011年第12期56卷 1097-1104页

作者：查婷婷陈爱喜杨文星 Department of Physics Southeast University Department of Applied Physics School of Basic ScienceEast China Jiaotong University

We investigate the generation and the evolution of continuous-variable(CV) entanglement from a laserdriven four-state atom inside a doubly resonant cavity under Raman *** transitions in the four-state atom independently interact with the two cavity modes,while two other transitions are driven by coupling laser *** including the atomic relaxation as well as cavity losses,we show that the CV entanglement with large mean number of photons can be generated in our *** also show that the intensity of the coupling laser fields can influence effectively the entanglement period of the cavity *** from the conventional resonant excitation scheme where zero one-photon detuning are required,it is found that the intensity and period of entanglement between the two cavity modes as well as the total mean photon number of the cavity field can be adjusted by properly modulating the frequency detuning.

关键词： continuous-variable entanglement quantum computing raman excitation

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continuous-variable entanglement in Tunnel-Coupled Double Quantum Wells

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Communications in Theoretical Physics 2009年第5期51卷 831-838页

作者： Lü Xin-You LIU Ji-Bing HAO Xiang-Ying HUANG Pei YANG Xiao-Xue School of Physics Huazhong University of Science and Technology Wuhan 430074 China

This paper investigates the generation and evolution of continuous-variable entanglement in an asymmetric coupled-quantum well （CQW） system. Our numerical results show that this CQW system can be regarded as a source of macroscopic entangled light over a wide range of initial states of the cavity field. This investigation can be used for achieving the macroscopic entangled light in the CQW solid-state medium, which is much more praeticaJ than that in an atomic medium because of its flexible design and the controllable interference strength.

关键词： continuous-variable entanglement semiconductor quantum well

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Tripartite continuous-variable entanglement of NOPA system

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Chinese Physics B 2018年第8期27卷 261-264页

作者： Chao-Ying Zhao Cheng-Mei Zhang College of Science Hangzhou Dianzi UniversityHangzhou 310018China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Nokia Solutions and Networks Han gzhou 310053China

We investigate the fundamental limits to the achievable tripartite continuous-variable （CV） entanglement criterion of a generalized Vl criterion. Our numerical simulation results show that the non-degenerate eigenvalues do effect the performances of the estimated minimum variances. From below the threshold to above the threshold, with the increase of the pump parameter, the tripartite CV entanglement gradually disappears. The different off-diagonal elements seriously distort the weights for entanglement. We can obtain a good tripartite CV entanglement by appropriately controlling the values of off-diagonal elements eij.

关键词： continuous-variable entanglement generalized V1 criterion, non-degenerate eigenvalues

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