腔量子电动力学中的量子隐形传态方案

腔量子电动力学中的量子隐形传态方案
 
摘要：在的第1部分中，我们首先介绍了前人在量子信息这个领域所取得的1些进展，包括腔量子电动力学中的量子信息，腔量子电动力学中的共振和非共振作用，量子隐形传态等。在正文中我们制备出纠缠W类态，并且通过单独的原子态测量完全识别出4个纠缠W类态，从而实现了基于腔量子电动力学的隐形传态方案（理论方案由Agrawal et al 在Phys. Rev. A. 74 (2006) 062320提出）。我们还把这种方法推广到传送未知两原子纠缠态。该方案的优点在于整个过程，由于原子和腔场大失谐作用，原子和腔场腔场之间没有能量的交换，因此该方案对腔的的品质要求大大的降低了。还且由于量子通道中多了1个原子，在传送过程中可靠程度大大加强了。

关键词：腔量子电动力学；纠缠；隐形传态；量子信息

Scheme for quantum teleportation in cavity quantum electrodynamics
 
Abstract:  In the first part of this paper, we have reviewed some progresses in the quantum information theory, such as cavity quantum electrodynamics (QED), resonant or non-resonant interaction between atoms and the cavity, quantum teleportation.  We have prepared the three-atom W-class entangled state, distinguished four mutually orthogonal W-class entangled state and then realized the teleportation scheme with W-class entangled state in the context of cavity quantum electrodynamics (which were proposed by Agrawal et al Phys. Rev. A. 74 (2006) 062320). We also generalize this idea to teleport unknown two-atom entangled state. The main advantage is that there is no energy exchange between the atoms and the cavity due to the large detuning interaction between them, thus the requirement of the quality of the cavity is greatly loosened. .The reliability of the scheme has been greatly enhanced due to increasing one atom in the quantum channel.

Key words: cavity QED; entanglement; teleportation; quantum information