Kerr介质腔中三能级原子与腔场相互作用系统量子保真度

Quantum fidelities for a three-level atom-field interaction system with a Kerr medium

研究了Kerr介质腔中相干态单模场与级联三能级原子共振相互作用系统中量子保真度的演化特性.结果表明,对真空初场,原子、场及系统保真度都呈现调制周期振荡;对不依赖强度的原子-场耦合系统,增大Kerr效应或增强初场强度都能提高原子的量子保真度,在原子量子保真度复苏时区同时提升场和系统的量子保真度,但对依赖强度耦合系统却无此作用.

Under the assumptions that the field was initially in a coherent state and the atom was in the most excited atomic state, this paper investigated time evolution properties of quantum fidelities for the atom, field, and compound system in the system consisting of a cascade three-level atom interacting with a single mode field in the presence of a Kerr medium. The results show that all fidelities exhibit modulated oscillations for initial vacuum field. In the case of intensity-independent field-atom coupling, enhancement of the Kerr effect or initial field intensity increases the quantum fidelity of the atom. Fidelities of the field and the compound system are also increased in the atomic fidelity revival regions. However, these effects do not occur to the intensity-dependent coupling case.