腔量子電動(dòng)力學(xué)中的量子隱形傳態(tài)方案

腔量子電動(dòng)力學(xué)中的量子隱形傳態(tài)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(gè)領(lǐng)域所取得的1些進(jìn)展，包括腔量子電動(dòng)力學(xué)中的量子信息，腔量子電動(dòng)力學(xué)中的共振和非共振作用，量子隱形傳態(tài)等。在正文中我們制備出糾纏W類態(tài)，并且通過(guò)單獨(dú)的原子態(tài)測(cè)量完全識(shí)別出4個(gè)糾纏W類態(tài)，從而實(shí)現(xiàn)了基于腔量子電動(dòng)力學(xué)的隱形傳態(tài)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(tài)。該方案的優(yōu)點(diǎn)在于整個(gè)過(guò)程，由于原子和腔場(chǎng)大失諧作用，原子和腔場(chǎng)腔場(chǎng)之間沒(méi)有能量的交換，因此該方案對(duì)腔的'的品質(zhì)要求大大的降低了。還且由于量子通道中多了1個(gè)原子，在傳送過(guò)程中可靠程度大大加強(qiáng)了。

關(guān)鍵詞：腔量子電動(dòng)力學(xué)；糾纏；隱形傳態(tài)；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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