Kerr效应对依赖强度耦合J-C模型中纠缠交换的影响

Influence of Kerr effect on entanglement transfer in the Jaynes-Cummings model via intensity-dependent coupling

在多个原子分别与多个腔场发生依赖强度耦合的相互作用系统中,运用全量子理论,研究了Kerr介质对纠缠信息在原子与腔场之间周期性可逆交换传递过程的影响。结果表明:Kerr介质对初始腔场为真空态或最低Fock态组成的纠缠态等一些特殊情形不产生任何影响。而对一般Fock态|n_k〉(n_k≠0)都会改变其纠缠信息转换的相位和周期。Kerr效应越强烈转换周期就越短,相反,可以利用选取不同Kerr介质来控制纠缠信息交换传递的快慢。另外,相位的改变也与腔场中光子数n_k(k=1,2,3,…,M)有关。

In the system of many atoms interacting with many cavity fields respectively via intensity- dependent coupling, the influence of Kerr medium on process of entangled information periodic transfer between the atoms and the cavity fields is studied by means of the complete quantum theory. It is found that Kerr medium does not influence on special cases which the initial cavity fields are vacuum states or entangled states superposing of the lowest Fock states, but the phase and period of entanglement information transfer are changed obviously for the general Fock states [nk〉 （nk ≠ 0） in the presence of Kerr effect. The stronger the Kerr effect, the shorter the transfer period. The Speed of the entangled information transfer can be controlled by choosing different Kerr medium. In the other hand, the alteration of the transfer phase has also close relation with the photon number nk （k = 1, 2, 3, …, M） in the cavity fields.