Protection of a Qubit via Subradiance: A Josephson Quantum Filter
Protection of a Qubit via Subradiance: A Josephson Quantum Filter
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DOI：
10.1103/physrevapplied.13.014051
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发表时间：
2019-09
影响因子：
4.6
通讯作者：
K. Koshino;S. Kono;Yasunobu Nakamura
中科院分区：
文献类型：
--
作者：
K. Koshino;S. Kono;Yasunobu Nakamura
超导量子比特与控制线之间的耦合不可避免地导致量子比特进入控制线的辐射衰减。我们提出了一种约瑟夫森量子滤波器（JQF），它在不降低DQ上的门速度的情况下，保护数据量子比特（DQ）免受控制线辐射衰减的影响。JQF由一个量子比特与DQ控制线强耦合组成，其工作原理是波导量子电动力学设置的子辐射效应特性。JQF是一种无源电路元件，因此适合集成在可扩展的超导量子比特系统中。
The coupling between a superconducting qubit and a control line inevitably results in radiative decay of the qubit into the line. We propose a Josephson quantum filter (JQF), which protects the data qubit (DQ) from radiative decay through the control line without reducing the gate speed on DQ. JQF consists of a qubit strongly coupled to the control line to DQ, and its working principle is a subradiance effect characteristic to waveguide quantum electrodynamics setups. JQF is a passive circuit element and is therefore suitable for integration in a scalable superconducting qubit system.