关于多比特电路量子动力学系统中光子自由度的消除方案研究

孟建宇; 王培月; 冯伟; 杨国建; 李新奇

北京师范大学物理系,北京,100875

On the scheme of cavity photon elimination in multi-qubit circuit-quantum electrodynamics system

摘要: 基于超导传输线和超导量子比特相互耦合的电路量子电动力学（quantumelectrodynamics，QED）系统，是研究固态量子信息和量子测量与控制的理想实验平台．本文在已有工作（单比特电路QED）基础上，进一步研究多比特电路QED系统．具体通过对两比特系统的量子测量和量子控制动力学的模拟，检验了“绝热消除”和“极化子变换”两种消除微腔光子自由度方法的适用条件．和单比特情况不同，我们特别检验了两比特系统Bell纠缠态的“确定性”制备问题．在量子路径水平上模拟发现，由于反馈操作引起量子比特状态翻转，使得极化子变换方法失效，它所导出的“有效测量算符”（其中含有非平庸的“宇称项”）此时也将变得没有意义．

关键词:

Abstract: Solid-state superconducting circuit-quantum electrodynamics (QED) system is a promising candidate for quantum information processing and an ideal platform for quantum measurement and quantum control studies. As an extension to our previous simulation for single qubit circuit-QED, in this work we simulate the quantum measurement and control of multi-qubit system. Particularly, we consider the deterministic generation of a two-qubit Bell state. In this context we examine the validity conditions of two cavity- photon-elimination scheme. On the level of quantum trajectory simulation, we find that, owing to the qubit flip caused by feedback, the advanced polaron-transformation scheme is no longer applicable if the measurement is not weak, which also makes meaningless the elegant effective measurement operator.

关于多比特电路量子动力学系统中光子自由度的消除方案研究

北京师范大学物理系,北京,100875

关键词:

On the scheme of cavity photon elimination in multi-qubit circuit-quantum electrodynamics system

北京师范大学物理系,北京,100875

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