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Nonclassicality and decoherence of the coherent superposition operation of photon subtraction and addition on the squeezed state

Nonclassicality and decoherence of the coherent superposition operation of photon subtraction and addition on the squeezed state
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摘要 The statistical properties of m-coherent superposition operation(μa + νa)^m on the single-mode squeezed vacuum state(M-SSVS) and its decoherence in a thermal environment are studied.Converting the M-SSVS to a squeezed Hermite polynomial excitation state,we obtain a compact expression for the normalization factor of M-SSVS,which is the Legendre polynomial of the squeezing parameter.We also derive the explicit expression of the Wigner function(WF) of the M-SSVS,and find the negative region of the WF in phase space.The decoherence effect on this state is then discussed by deriving the time evolution of the WF.Using the negativity of the WF,the loss of nonclassicality is then discussed. The statistical properties of m-coherent superposition operation(μa + νa)^m on the single-mode squeezed vacuum state(M-SSVS) and its decoherence in a thermal environment are studied.Converting the M-SSVS to a squeezed Hermite polynomial excitation state,we obtain a compact expression for the normalization factor of M-SSVS,which is the Legendre polynomial of the squeezing parameter.We also derive the explicit expression of the Wigner function(WF) of the M-SSVS,and find the negative region of the WF in phase space.The decoherence effect on this state is then discussed by deriving the time evolution of the WF.Using the negativity of the WF,the loss of nonclassicality is then discussed.
出处 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期163-168,共6页 中国物理B(英文版)
基金 Project supported by the National Natural Science Foundation of China (Grant No. 11047133) the Natural Science Foundation of Jiangxi Province,China (Grant Nos. 20114BAB202004 and 2009GZW0006) the Research Foundation of the Education Department of Jiangxi Province,China (GrantNo. GJJ11390)
关键词 NONCLASSICALITY DECOHERENCE coherent superposition of photon subtraction and addition Wigner function nonclassicality,decoherence,coherent superposition of photon subtraction and addition,Wigner function
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