Testing Bell’s inequality and measuring the entanglement using superconducting nanocircuits

Guang-Ping He, Shi-Liang Zhu, Z. D. Wang, and Hua-Zhong Li
Phys. Rev. A 68, 012315 – Published 15 July 2003
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Abstract

An experimental scheme is proposed to test Bell’s inequality by using superconducting nanocircuits. In this scheme, quantum entanglement of a pair of charge qubits separated by a sufficiently long distance may be created by cavity quantum electrodynamic techniques; the population of qubits is experimentally measurable by dc currents through the probe junctions, and one measured outcome may be recorded for every experiment. Therefore, both locality and detection-efficiency loopholes should be closed in the same experiment. We also propose a useful method to measure the amount of entanglement based on the concurrence between Josephson qubits. The measurable variables for Bell’s inequality as well as the entanglement are expressed in terms of a useful phase-space Q function.

  • Received 6 March 2003

DOI:https://doi.org/10.1103/PhysRevA.68.012315

©2003 American Physical Society

Authors & Affiliations

Guang-Ping He1,*, Shi-Liang Zhu2,3,†, Z. D. Wang2,4,‡, and Hua-Zhong Li1,§

  • 1Advanced Research Center, Zhongshan University, Guangzhou 510275, China
  • 2Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, China
  • 3Department of Physics, South China Normal University, Guangzhou 510631, China
  • 4Department of Material Science and Engineering, University of Science and Technology of China, Hefei, China

  • *Electronic address: puaarc02@zsu.edu.cn
  • Electronic address: slzhu@graduate.hku.hk
  • Electronic address: zwang@hkucc.hku.hk
  • §Electronic address: puaarc@zsu.edu.cn

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Vol. 68, Iss. 1 — July 2003

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