首页|Threshold-independent method for single-shot readout of spin qubits in semiconductor quantum dots

Threshold-independent method for single-shot readout of spin qubits in semiconductor quantum dots

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The single-shot readout data process is essential for the realization of high-fidelity qubits and fault-tolerant quan-tum algorithms in semiconductor quantum dots.However,the fidelity and visibility of the readout process are sensitive to the choice of the thresholds and limited by the experimental hardware.By demonstrating the linear dependence be-tween the measured spin state probabilities and readout visibilities along with dark counts,we describe an alternative threshold-independent method for the single-shot readout of spin qubits in semiconductor quantum dots.We can obtain the extrapolated spin state probabilities of the prepared probabilities of the excited spin state through the threshold-independent method.We then analyze the corresponding errors of the method,finding that errors of the extrapolated probabilities cannot be neglected with no constraints on the readout time and threshold voltage.Therefore,by limiting the readout time and threshold voltage,we ensure the accuracy of the extrapolated probability.We then prove that the efficiency and robustness of this method are 60 times larger than those of the most commonly used method.Moreover,we discuss the influence of the electron temperature on the effective area with a fixed external magnetic field and provide a preliminary demonstration for a single-shot readout of up to 0.7 K/1.5 T in the future.

quantum computationquantum dotquantum state readout

胡睿梓、祝圣凯、张鑫、周圆、倪铭、马荣龙、罗刚、孔真真、王桂磊、曹刚、李海欧、郭国平

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CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China

CAS Center For Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

Key Laboratory of Microelectronics Devices and Integrated Technology,Institute of Microelectronics,Chinese Academy of Sciences,Beijing 100029,China

Beijing Superstring Academy of Memory Technology,Beijing 100176,China

Origin Quantum Computing Company Limited,Hefei 230026,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaAnhui Province Natural Science Foundation

120743689216520712034018620041852108085J03

2024

10.1088/1674-1056/ace3a9

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(1)
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