腔量子电动力学中的密集编码方案研究

腔量子电动力学中的密集编码方案研究
 
摘要  在的前言中我们简单介绍了腔量子电动力学和量子密集编码的基本原理，在正文中我们首先提出1种基于腔量子电动力学制备W类纠缠态的方案，并且识别出4个互相正交的3原子W类纠缠态，从而实现了1个基于腔量子电动力学的密集编码实验方案（理论方案是由Agrawal等人在Phys. Rev. A. 74 (2006) 062320中提出来的）。在这个方案中所有原子同时和大失谐腔场作用，腔场只是被虚激发，因此该方案对腔场的消相干不敏感，而且具备实验可行性。
关键词：量子密集编码；W类态；腔量子电动力学
Schemes for implementing perfect dense coding in cavity QED
 
Abstract: In the introduction we review the concept of cavity quantum electrodynamics (QED) and quantum dense coding. We propose an experimentally feasible scheme of preparing W-class entangled state, distinguishing four mutually orthogonal W-class entangled state and then implementing perfect quantum dense coding with three-atom W-class entangled state, which was proposed by Agrawal et al (Phys. Rev. A. 74 (2006) 062320), in cavity QED. In the scheme the atoms interact simultaneously with a highly detuned cavity field and the cavity is only virtually excited, thus the scheme is insensitive to the cavity decay，and it can be carried out in the experiment.
Keywords: Dense coding； W-class state； cavity QED