Chin. Phys. Lett.  2021, Vol. 38 Issue (11): 110303    DOI: 10.1088/0256-307X/38/11/110303
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
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Zhiling Wang, Zenghui Bao, Yukai Wu  et al  2021 Chin. Phys. Lett. 38 110303
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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.
Received: 24 September 2021      Editors' Suggestion Published: 27 October 2021
PACS:  03.67.Lx (Quantum computation architectures and implementations)  
  85.25.-j (Superconducting devices)  
  03.67.-a (Quantum information)  
Fund: Supported by the Beijing Academy of Quantum Information Science, the Frontier Science Center for Quantum Information of the Ministry of Education of China through the Tsinghua University Initiative Scientific Research Program, the National Natural Science Foundation of China (Grant No. 11874235), the National Key Research and Development Program of China (Grant Nos. 2016YFA0301902 and 2020YFA0309500), Y.K.W. acknowledges support from Shuimu Tsinghua Scholar Program and the International Postdoctoral Exchange Fellowship Program.
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Zhiling Wang
Zenghui Bao
Yukai Wu 
Yan Li 
Cheng Ma 
Tianqi Cai 
Yipu Song 
Hongyi Zhang
and Luming Duan
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