Continuous-Variable Entanglement Generation from a Four-State Atom under Raman Excitation

We investigate the generation and the evolution of continuous-variable （CV） entanglement from a laser- driven four-state atom inside a doubly resonant cavity under Raman excitation. Two transitions in the four-state atom independently interact with the two cavity modes, while two other transitions a...

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Published inCommunications in theoretical physics Vol. 56; no. 12; pp. 1097 - 1104
Main Author 查婷婷 陈爱喜 杨文星
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.12.2011
Subjects
Atomic properties
Entanglement
Evolution
Excitation
Holes
Joining
Lasers
Photons
共振激发
原子跃迁
拉曼
模式耦合
激光驱动
纠缠光子
连续变量
频率失谐
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Summary:We investigate the generation and the evolution of continuous-variable （CV） entanglement from a laser- driven four-state atom inside a doubly resonant cavity under Raman excitation. Two transitions in the four-state atom independently interact with the two cavity modes, while two other transitions are driven by coupling laser fields. By including the atomic relaxation as well as cavity losses, we show that the CV entanglement with large mean number of photons can be generated in our scheme. We also show that the intensity of the coupling laser fields can influence effectively the entanglement period of the cavity field. Different from the conventional resonant excitation scheme where zero one-photon detuning are required, it is found that the intensity and period of entanglement between the two cavity modes as well as the total mean photon number of the cavity field can be adjusted by properly modulating the frequency detuning.
Bibliography:ZHA Ting-Ting , CHEN Ai-Xi , YANG Wen-Xing （1 Department of Physics, Southeast University, Nanjing 210096, China 2Department of Applied Physics, School of Basic Science, East China Jiaotong University, Nanchang 330013, China）
continuous-variable entanglement, quantum computing, raman excitation
11-2592/O3
We investigate the generation and the evolution of continuous-variable （CV） entanglement from a laser- driven four-state atom inside a doubly resonant cavity under Raman excitation. Two transitions in the four-state atom independently interact with the two cavity modes, while two other transitions are driven by coupling laser fields. By including the atomic relaxation as well as cavity losses, we show that the CV entanglement with large mean number of photons can be generated in our scheme. We also show that the intensity of the coupling laser fields can influence effectively the entanglement period of the cavity field. Different from the conventional resonant excitation scheme where zero one-photon detuning are required, it is found that the intensity and period of entanglement between the two cavity modes as well as the total mean photon number of the cavity field can be adjusted by properly modulating the frequency detuning.
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ISSN:0253-6102
DOI:10.1088/0253-6102/56/6/22