文献类型：期刊文献

英文题名：Analytical ground state for the Jaynes-Cummings model with ultrastrong coupling

作者：Zhang, Yuanwei[1,2];Chen, Gang[1,3];Yu, Lixian[3];Liang, Qifeng[3];Liang, J. -Q.[2];Jia, Suotang[1]

机构：[1]Shanxi Univ, State Key Lab Quantum Opt & Quantum Opt Devices, Coll Phys & Elect Engn, Taiyuan 030006, Peoples R China;[2]Shanxi Univ, Inst Theoret Phys, Taiyuan 030006, Peoples R China;[3]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China

年份：2011

卷号：83

期号：6

外文期刊名：PHYSICAL REVIEW A

收录：SCI-EXPANDED(收录号：WOS:000291726000007)、、EI(收录号：20113214212334)、Scopus(收录号：2-s2.0-79961034741)、WOS

语种：英文

外文关键词：Ground state - Photons

外文摘要：We present a generalized variational method to analytically obtain the ground-state properties of the Jaynes-Cummings model with the ultrastrong coupling. An explicit expression for the ground-state energy, which agrees well with the numerical simulation in a wide range of the experimental parameters, is given. In particular, the introduced method can successfully solve this Jaynes-Cummings model with the positive detuning (the atomic resonant level is larger than the photon frequency), which cannot be treated in the adiabatical approximation and the generalized rotating-wave approximation. Finally, we also demonstrate analytically how to control the mean photon number by means of the current experimental parameters including the photon frequency, the coupling strength, and especially the atomic resonant level.