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arXiv 1402.7310quant-phcond-mat.mes-hall
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理解无序下受保护量子线路的简并基态

Understanding degenerate ground states of a protected quantum circuit in the presence of disorder

Joshua Dempster, Bo Fu, David G. Ferguson, D. I. Schuster, Jens Koch

摘要:

最近的理论提议表明,利用两个超级电感器的简单电路可以产生具有基态简并性的量子位[P.Brooks等人,A87,052306(2013)]。我们执行一个完整的电路分析以及精确对角化的电路哈密顿阐明的频谱和低的波函数的性质,这$0-π$设备。我们表明,基态简并是强大的电荷,磁通和临界电流的无序以及电路参数的适度变化不敏感。我们的治疗是非微扰,提供了访问激发态和矩阵元素,并立即适用于中间参数制度的实验兴趣。

英文摘要:

A recent theoretical proposal suggests that a simple circuit utilizing two superinductors may produce a qubit with ground state degeneracy [P. Brooks et al., Phys. Rev. A 87, 052306 (2013)]. We perform a full circuit analysis along with exact diagonalization of the circuit Hamiltonian to elucidate the nature of the spectrum and low-lying wave functions of this $0-π$ device. We show that the ground state degeneracy is robust to disorder in charge, flux and critical current as well as insensitive to modest variations in the circuit parameters. Our treatment is non-perturbative, provides access to excited states and matrix elements, and is immediately applicable also to intermediate parameter regimes of experimental interest.

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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