利用两能级原子与腔场相互作用实现纠缠压缩态的纠缠浓缩

根据大失谐条件下原子-腔场相互作用的特点，讨论了一个制备纠缠压缩态的方法，提出了一个利用两能级原子与腔场相互作用实现纠缠压缩态纠缠浓缩的方案。在这个方案中，两束具有相同振幅但有着 相位差的压缩光 和 构成的纠缠态光场被用来作为量子信道。通过利用两能级原子与腔场的相互作用以及两模正交态测量实现了这个纠缠浓缩的过程。结果表明：对于纠缠压缩态，无论其初始的纠缠是多么微弱，利用这种方法总有一定的几率可以从部分纠缠态中提取出最大纠缠态。

Entanglement Concentration of the Entangled Squeezed State

Base on the dispersive atom-cavity field interaction, the scheme for preparing the entangled squeezed state is discussed. An experimentally feasible protocol for realizing entanglement concentration of the entangled squeezed states by using a two-level atom interacting with caving fields is proposed. In this protocol, the entanglement between two squeezed states, and , with the same amplitude but a phase difference is utilized as the quantum channel. The process of the entanglement concentration is implemented by using a two-level atom interacting with caving fields and two-mode orthogonal states measurement. With the present development of cavity quantum electrodynamics (QED) techniques, the scheme can be achieved.