中国物理B ›› 2017, Vol. 26 ›› Issue (9): 90303-090303.doi: 10.1088/1674-1056/26/9/090303

• GENERAL • 上一篇    下一篇

A high-fidelity memory scheme for quantum data buses

Bo-Yang Liu(刘博阳), Wei Cui(崔巍), Hong-Yi Dai(戴宏毅), Xi Chen(陈希), Ming Zhang(张明)   

  1. 1 College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China;
    2 School of Automation Science and Engineering, South China University of Technology, Guangzhou 510641, China;
    3 College of Science, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2017-03-07 修回日期:2017-05-16 出版日期:2017-09-05 发布日期:2017-09-05
  • 通讯作者: Ming Zhang E-mail:zhangming@nudt.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61673389, 61273202, 61134008, and 11404113).

A high-fidelity memory scheme for quantum data buses

Bo-Yang Liu(刘博阳)1, Wei Cui(崔巍)2, Hong-Yi Dai(戴宏毅)3, Xi Chen(陈希)1, Ming Zhang(张明)1   

  1. 1 College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073, China;
    2 School of Automation Science and Engineering, South China University of Technology, Guangzhou 510641, China;
    3 College of Science, National University of Defense Technology, Changsha 410073, China
  • Received:2017-03-07 Revised:2017-05-16 Online:2017-09-05 Published:2017-09-05
  • Contact: Ming Zhang E-mail:zhangming@nudt.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 61673389, 61273202, 61134008, and 11404113).

摘要:

A novel quantum memory scheme is proposed for quantum data buses in scalable quantum computers by using adjustable interaction. Our investigation focuses on a hybrid quantum system including coupled flux qubits and a nitrogen-vacancy center ensemble. In our scheme, the transmission and storage (retrieval) of quantum state are performed in two separated steps, which can be controlled by adjusting the coupling strength between the computing unit and the quantum memory. The scheme can be used not only to reduce the time of quantum state transmission, but also to increase the robustness of the system with respect to detuning caused by magnetic noises. In comparison with the previous memory scheme, about 80% of the transmission time is saved. Moreover, it is exemplified that in our scheme the fidelity could achieve 0.99 even when there exists detuning, while the one in the previous scheme is 0.75.

关键词: quantum memory, hybrid quantum system, quantum data bus

Abstract:

A novel quantum memory scheme is proposed for quantum data buses in scalable quantum computers by using adjustable interaction. Our investigation focuses on a hybrid quantum system including coupled flux qubits and a nitrogen-vacancy center ensemble. In our scheme, the transmission and storage (retrieval) of quantum state are performed in two separated steps, which can be controlled by adjusting the coupling strength between the computing unit and the quantum memory. The scheme can be used not only to reduce the time of quantum state transmission, but also to increase the robustness of the system with respect to detuning caused by magnetic noises. In comparison with the previous memory scheme, about 80% of the transmission time is saved. Moreover, it is exemplified that in our scheme the fidelity could achieve 0.99 even when there exists detuning, while the one in the previous scheme is 0.75.

Key words: quantum memory, hybrid quantum system, quantum data bus

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
42.50.Ex (Optical implementations of quantum information processing and transfer) 85.25.Hv (Superconducting logic elements and memory devices; microelectronic circuits)