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Chinese Physics, 2002, Vol. 11(4): 339-345    DOI: 10.1088/1009-1963/11/4/306
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

Continuous variable entanglement swapping in a thermal environment

Liu Jin-Ming (刘金明), Li Jian (李剑), Guo Guang-Can (郭光灿)
Laboratory of Quantum Communication and Quantum Computation, Department of Physics, University of Science and Technology of China, Hefei 230026, China
Abstract  With the application of a Wigner function description of a two-mode squeezed state, we study a protocol of continuous variable entanglement swapping in a noisy quantum channel. Assuming that the two initial entangled states are coupled with the same environment, we analyse the quantum state emerging from the swapping and obtain the inseparable condition for the output correlation. It is found that there is more noise resulting from the entanglement swapping than from the direct transmission, no matter what values of displacement gain are chosen.
Keywords:  Continuous variable      entanglement swapping      squeezed state      Wigner function  
Received:  13 August 2001      Revised:  24 November 2001      Accepted manuscript online: 
PACS:  42.50.Dv (Quantum state engineering and measurements)  
  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.Hk (Quantum communication)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 19874056).

Cite this article: 

Liu Jin-Ming (刘金明), Li Jian (李剑), Guo Guang-Can (郭光灿) Continuous variable entanglement swapping in a thermal environment 2002 Chinese Physics 11 339

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