腔量子電動力學中的量子隱形傳態方案

腔量子電動力學中的量子隱形傳態方案

腔量子電動力學中的量子隱形傳態方案
 
摘要：在論文的第1部分中，我們首先介紹了前人在量子信息這個領域所取得的1些進展，包括腔量子電動力學中的量子信息，腔量子電動力學中的共振和非共振作用，量子隱形傳態等。在正文中我們制備出糾纏W類態，并且通過單獨的原子態測量完全識別出4個糾纏W類態，從而實現了基于腔量子電動力學的隱形傳態方案（理論方案由Agrawal et al 在Phys. Rev. A. 74 (2006) 062320提出）。我們還把這種方法推廣到傳送未知兩原子糾纏態。該方案的優點在于整個過程，由于原子和腔場大失諧作用，原子和腔場腔場之間沒有能量的交換，因此該方案對腔的的品質要求大大的降低了。還且由于量子通道中多了1個原子，在傳送過程中可靠程度大大加強了。

關鍵詞：腔量子電動力學；糾纏；隱形傳態；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
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