基于腔衰减辅助的受激拉曼绝热跟随技术的量子计算方案（英文）

Quantum computation in decoherence-free subspace via cavity-decay-assisted adiabatic passage

提出了一个基于腔QED系统实现无退相干子空间中任意两比特纠缠逻辑门的理论方案,结合已有的单量子比特的逻辑操作,就可以完成任意的量子计算.两个相同的原子囚禁在单模光学腔中,并受到外加激光场的驱动,在腔场初态处于真空态的情况下,大的腔场衰减相当于对腔场进行频繁测量,而使之保持在真空态,这种效应就是腔场衰减协助的量子Zeno效应,它通过生成腔场的无退相干子空间而有效地抑制了腔场衰减的影响.另一方面,利用受激Raman绝热过程来克服原子自发辐射的影响,所以方案可以获得很高保真度的纠缠逻辑门.

In this work,a scheme for quantum computation based on cavity QED in a decoherence- free subspaces via using the technique of stimulated Raman adiabatic passage （STIRAP） is pro- posed. To implement universal quantum logic gates that form basic blocks of quantum computation, we suppose two atoms are trapped in a single-mode cavity with large decay rates and are driven by the laser fields. The relatively large cavity decay can be used for the continuous detection of the cavi- ty mode as so-called ＂cavity-decay-induced quantum Zeno effect＂. The results show that, decoherenee induced by the atomic spontaneous emission and cavity decay can be efficiently suppress with the STIRAP technique and the quantum Zeno effect.