中国物理B ›› 2021, Vol. 30 ›› Issue (1): 10301-.doi: 10.1088/1674-1056/abc549

• • 上一篇    下一篇

  

  • 收稿日期:2020-09-24 修回日期:1900-01-01 接受日期:2020-10-28 出版日期:2020-12-17 发布日期:2020-12-30

Double-dot interferometer for quantum measurement of Majorana qubits and stabilizers

Kai Zhou(周凯)1, Cheng Zhang(张程)1, Lupei Qin(秦陆培)2,†, and Xin-Qi Li(李新奇)2,1,‡   

  1. 1 Department of Physics, Beijing Normal University, Beijing 100875, China; 2 Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin 300072, China
  • Received:2020-09-24 Revised:1900-01-01 Accepted:2020-10-28 Online:2020-12-17 Published:2020-12-30
  • Contact: †Corresponding author. E-mail: qinlupei@tju.edu.cn ‡Corresponding author. E-mail: xinqi.li@tju.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303304) and the National Natural Science Foundation of China (Grant Nos. 11675016, 11974011, and 61905174).

RichHTML

2

PDF (PC)

166

赞

Abstract: Motivated by the need of quantum measurement of Majorana qubits and surface-code stabilizers, we analyze the performance of a double-dot interferometer under the influence of environment noise. The double-dot setup design allows accounting for the full multiple tunneling process between the dots through the Majorana island, within a master equation approach. In the co-tunneling regime, which results in a Majorana-mediated effective coupling between the dots, the master equation approach allows us to obtain analytic solutions for the measurement currents. The measurement quality, characterized by figures of merit such as the visibility of measurement signals, is carried out in regard to the unusual decoherence effect rather than `which-path' dephasing. The results obtained in this work are expected to be useful for future experiments of Majorana qubit and stabilizer measurements.

Key words: Majorana qubits, stabilizers, quantum measurements

中图分类号:  (Foundations of quantum mechanics; measurement theory)

  • 03.65.Ta