相位协变量子克隆的腔-超导量子干涉仪实现  

Implementation of Phase-covariant Quantum Cloning with Superconducting Quantum-interference Devices in Cavity QED

作　　者：江秀梅[1] 刘大明[1] 郑亦庄[1] 

机构地区：[1]温州大学物理与电子信息工程学院,浙江温州325035

出　　处：《量子光学学报》2010年第4期276-282,共7页Journal of Quantum Optics

基　　金：国家自然科学基金(批准号:11074190);浙江省自然科学基金(批准号:Y6090529)

摘　　要：在腔-超导量子干涉仪(SQUID)体系中提出了两个实现1→2最优相位协变量子克隆的方案。在这两个方案中,三能级SQUID通过拉曼转换与量子化腔场和微波脉冲相作用。在大失谐的条件下,激发态被绝热消去。腔场始终处于真空态,在腔和SQUID之间没有信息转移,腔的衰退得到很好的抑制。用这种方法,相位协变量子克隆可以通过四步来实现。We propose two schemes for realizing 1→2 economical phase-covariant quantum cloning with superconducting quantum-interference devices （SQUID） in cavity QED. In our schemes, the SQUIDs with three levels act with a quantized cavity field and classical microwave pluses via Raman transition. On the condition of large detuning, the excited state would be eliminated adiabaticly. During the whole operation, the cavity field is in the vacuum state at all times, so there is no transfer of quantum information between the SQUIDs and cavity, thus the cavity decay is largely suppressed. By using this method, we can realize the phase-covariant quantum cloning by four steps.

关 键 词：超导量子干涉仪 相位协变量子克隆 拉曼转换 

分 类 号：O431[机械工程—光学工程]