物理学报2013，Vol.62Issue(1)：212-219,8.DOI:10.7498/aps.62.014208
光子增减叠加相干态在热环境中的退相干
Decoherence of a photon-subtraction-addition coherent state in a thermal environment
摘要
Abstract
We investigate the nonclassicality and decoherence of a photon-subtraction-addition coherent state (a+ +a)m∣a) in a thermal environment. Its nonclassicality is discussed by deriving analytically Mandel's Q parameter, photon number distribution, and Wigner function. It is shown that if the condition ∣2z* + a - a* ∣2 < 1 is satisfied, the Wigner function always presents the negativity for the one-order photon-subtraction-addition coherent state (m = 1). Based on the evolution formula of Wigner function, we derive a compact expression for Wigner function in the thermal environment. It is found that when kt < (l/2)ln[((n) + 2)/(2(n)+ 1)] there is no negativity for the case of m = 1. In addition, the evolution of nonclassicality is discussed in terms of the negative volume of Wigner function.关键词
光子增减叠加操作/Q-参数/Wigner函数/退相干Key words
photon-subtraction-addition operation/ Q-parameter/ Wigner function/ decoherence引用本文复制引用
张浩亮,贾芳,徐学翔,郭琴,陶向阳,胡利云..光子增减叠加相干态在热环境中的退相干[J].物理学报,2013,62(1):212-219,8.基金项目
国家自然科学基金(批准号:11264018)、江西省自然科学基金(批准号:2010GQW0027,2009GZW0006)、江西省教育厅科技项目(批准号:GJJ12171)和江西师范大学青年英才培养计划资助的课题. （批准号:11264018）
