J-C模型中与真空场相互作用的原子的偏态信息

Skew Information of an Atom Interacting with Vacuum Field in J-C model

利用约化密度矩阵及信息的定义,基于J-C模型,研究了单模真空场作用下的单个二能级原子的Wigner-Yanase偏态信息。结果表明:由于与光场的相互作用,原子的Wigner-Yanase偏态信息出现丢失与恢复的现象,随时间周期性变化;若初始时刻原子处于激发态,则在某些时刻Wigner-Yanase偏态信息会全部丢失;但合适的原子初态和较强的原子与场相互作用,都会对阻抗原子偏态信息的丢失起到积极的作用。

This paper used the reduced density matrix and the definition of information. It was based on J-C model. It studied the Wigner-Yanase skew information, in a two-level atom interacting with single mode vacuum field. The results showed that due to the interaction between atom and the vacuum field, the Wigner-Yanase skew information of atom＇s losing and reviving periodically changes through time passing by; If atom stays in excied state initially, then the Wigner-Yanas skew information in atom loses completely; But a suitable initial state of atom and strong interaction between atom and vacuum field can play a positive role in preventing loss of the Wigner-Yanas skew information.