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Abstract

Quantum state measurement is essential for reading-out a quantum computing outcome. Meanwhile, the readout results are always affected by the large noise of quantum measurements in physical implementation, which also hinders the large-scale expansion of quantum computing. In light of this, we present an indirect quantum state readout method based on a single ancilla qubit that can avoid the large noise of multiple-qubit measurements. The theoretical analysis and simulations indicate that our method is more robust against the measurement noise and promises to become a method of large-scale quantum error correction and high-fidelity quantum state readout.

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Authors and contacts

Corresponding author:Huang He-Liang,quanhhl@ustc.edu.cn; Bao Wan-Su,bws@qiclab.cn

Funds:Project supported by the Youth Talent Lifting Project, China (Grant No. 2020-JCJQ-QT-030), the National Natural Science Foundation of China (Grant Nos. 11905294, 11805279), the Open Research Fund from State Key Laboratory for High Performance Computing, National University of Defense Technology, China (Grant No. 201901-01), and the China Postdoctoral Science Foundation.

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Vol. 70, Issue 21 - 2021-11-05

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