文献类型：期刊文献

英文题名：Quantifying micro-macro entanglement of a single-photon entangled state by virtue of Wigner function method

作者：Yuan, Hong-Chun[1,2];Wang, Zhen[3];Chen, Qin-Miao[4];Dou, Xiao-Ming[1,4]

机构：[1]Univ Shanghai Sci & Technol, Engn Res Ctr Opt Instrument & Syst, Shanghai 200093, Peoples R China;[2]Changzhou Inst Technol, Coll Optoelect Engn, Changzhou 213002, Peoples R China;[3]Changzhou Inst Technol, Sch Sci, Changzhou 213002, Peoples R China;[4]E China Univ Sci & Technol, Sch Sci, Shanghai 200237, Peoples R China

年份：2015

卷号：30

期号：23

外文期刊名：MODERN PHYSICS LETTERS A

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000358259500003)】；

基金：The project was supported by the National Natural Science Foundation of China (Nos. 11447002 and 11447202), the Research Foundation for Changzhou Institute of Modern Optoelectronic Technology (No. CZGY15), the Innovation Program of Shanghai Municipal Education Commission (No. 13YZ073) and the Leading Academic Discipline Project of Shanghai Municipal Government (No. S30502).

语种：英文

外文关键词：Single-photon entangled state; Wigner function; concurrence; micro-macro entanglement

摘要：In this paper, using Wigner function (WF) method in phase space, we re-investigate micro-macro entanglement of a single-photon entangled state after one-sided amplification and de-amplification proposed by Simon's group, and discuss the effects of the amplification and the loss. For the input-output process, we first build the relation between the input WF and the output WF. Next, the analytical expression of the output WF is derived related to the factors of the amplification and the loss. Finally, based on the above results, using the trace rule we also obtain the exact expressions of the detected probability and concurrence to quantify micro-macro entanglement, and analyze numerically the results. The results show that it is possible to detect micro-macro photon-number entanglement for reasonable values of photon loss.