超欧姆型热库环境下互感效应对磁通量子比特退相干的影响  

Mutual inductance's influence on flux qubits decoherence under super-Ohm thermal reservoir environment

作　　者：邹雄[1] 冯斌斌[1] 嵇英华[1,2] 

机构地区：[1]江西师范大学物理与通信电子学院,江西南昌330022 [2]江西省光电子与通信重点实验室,江西南昌330022

出　　处：《量子电子学报》2012年第6期714-722,701,共9页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(11164009)资助项目

摘　　要：在二能级近似下运用Bloch-Redfield方程,研究了超导量子电路中的磁通量子比特退相干在超欧姆热库环境下受互感效应的影响。研究结果表明:1)在超欧姆热库环境下,提高环境指标系数有利于延长超导磁通量子比特的退相干时间;2)构建超欧姆型热库环境可以改进固态量子比特的退相干;3)电感元件间的互感耦合对量子电路系统退相干的影响是比较复杂的,调控好电感元件间的互感耦合有利于提高退相干时间。Using two-level approximation with the Bloch-Redfield equation, the flux quantum qubit decoherence was investigated in superconducting qubit circuit affected by the mutual inductance＇s influence under super-Ohm thermal reservoir environment. The results show that, firstly under the super-Ohm thermal reservoir environment, the improvement of the environmental indicator coefficient can help to extend the decoherence time of the superconducting flux qubits, thus improving the magnetic flux qubits decoherence. Secondly, building super-Ohm thermal reservoir environment can improve the solid-state qubit decoherence. Finally, the effects of the mutual inductance coupling between the inductive elements on quantum circuit system＇s decoherence are more complicat% good regulation of the mutual inductance between the inductive coupling elements can help to improve the decoherence time.

关 键 词：量子光学 退相干 磁通量子比特 超欧姆型热库 

分 类 号：O431[机械工程—光学工程]