Improved Superconducting Qubit State Readout by Path Interference
Zhiling Wang† , Zenghui Bao† , Yukai Wu , Yan Li , Cheng Ma , Tianqi Cai , Yipu Song , Hongyi Zhang* , and Luming Duan*
Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China
Abstract ：High fidelity single shot qubit state readout is essential for many quantum information processing protocols. In superconducting quantum circuit, the qubit state is usually determined by detecting the dispersive frequency shift of a microwave cavity from either transmission or reflection. We demonstrate the use of constructive interference between the transmitted and reflected signal to optimize the qubit state readout, with which we find a better resolved state discrimination and an improved qubit readout fidelity. As a simple and convenient approach, our scheme can be combined with other qubit readout methods based on the discrimination of cavity photon states to further improve the qubit state readout.
收稿日期: 2021-09-24
Editors' Suggestion
出版日期: 2021-10-27
:
03.67.Lx
(Quantum computation architectures and implementations)
85.25.-j
(Superconducting devices)
03.67.-a
(Quantum information)
引用本文:
. [J]. 中国物理快报, 2021, 38(11): 110303-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/11/110303
或
https://cpl.iphy.ac.cn/CN/Y2021/V38/I11/110303
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2021, Vol. 38 
