Testing Bell’s inequality in a constantly coupled Josephson circuit by effective single-qubit operations

L. F. Wei, Yu-xi Liu, and Franco Nori
Phys. Rev. B 72, 104516 – Published 26 September 2005

Abstract

In superconducting circuits with interbit untunable (e.g., capacitive) couplings, ideal local quantum operations cannot be exactly performed on individual Josephson qubits. Here we propose an effective dynamical decoupling approach to overcome the “fixed-interaction” difficulty for effectively implementing elemental logical gates for quantum computation. The proposed single-qubit operations and local measurements should allow testing Bell’s inequality with a pair of capacitively coupled Josephson qubits. This provides a powerful approach, besides spectral-analysis [Nature 421, 823 (2003); Science 300, 1548 (2003)], to verify the existence of macroscopic quantum entanglement between two fixed-coupling Josephson qubits.

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  • Received 1 August 2005

DOI:https://doi.org/10.1103/PhysRevB.72.104516

©2005 American Physical Society

Authors & Affiliations

L. F. Wei1,2, Yu-xi Liu1, and Franco Nori1,3

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan
  • 2Institute of Quantum Optics and Quantum Information, Department of Physics, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China
  • 3Center for Theoretical Physics, Physics Department, CSCS, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA

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Vol. 72, Iss. 10 — 1 September 2005

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