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arXiv 1608.04849quant-ph
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一种快速CNOT门的Dressed State方案

Dressed-state scheme for a fast CNOT gate

Jin-Lei Wu, Xin Ji, Shou Zhang

摘要:

利用一种高可行性的缀饰态方案,在腔QED系统中实现了一个快速CNOT门,该方案大大加快了量子系统的绝热布居转移。腔QED系统由两个完全相同的五能级原子组成,它们分别被囚禁在由光纤连接的两个光学腔中。利用量子芝诺动力学原理,采用三步六脉冲构造了CNOT门。由于不需要考虑绝热条件,而且所有脉冲的开关都是平滑的,因此该方案在实验上是快速可行的。数值模拟表明,构造CNOT门的平均保真度相当高,门操作时间相对较短。利用主方程讨论了该方案对原子自发发射保真度和腔中光子泄漏的影响,结果表明该方案对退相干具有较强的鲁棒性。

英文摘要:

A highly feasible dressed-state scheme, which greatly speeds up the adiabatic population transfer of a quantum system, is applied for implementing a fast CNOT gate in a cavity QED system. The cavity QED system consists of two identical five-level atoms which are respectively trapped in two optical cavities connected by a fiber. With the help of quantum Zeno dynamics, the CNOT gate is constructed by three steps with six pulses. Because the adiabatic condition is not necessary to be considered and all of the pulses are smoothly turned on and off, the scheme is fast and feasible in experiment. Numerical simulations indicate that the average fidelity for constructing the CNOT gate is quite high and the gate operation time is relatively short. Moreover, the effects on the fidelity of the atomic spontaneous emission and the photon leakages from the cavities are discussed by the master equation and the result shows the scheme is robust against the decoherence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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