Detecting highly entangled states with a joint qubit readout

J. M. Chow, L. DiCarlo, J. M. Gambetta, A. Nunnenkamp, Lev S. Bishop, L. Frunzio, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
Phys. Rev. A 81, 062325 – Published 17 June 2010

Abstract

A single-channel joint readout is used to analyze highly entangled two-qubit states in a circuit quantum electrodynamics architecture. The measurement model for the readout is fully characterized, demonstrating a large sensitivity to two-qubit correlations. We quantify the high degree of entanglement by measuring a violation of the Clauser-Horne-Shimony-Holt inequality with a value of 2.61±0.04, without optimizing the preparation of the two-qubit state. In its present form, this joint readout can resolve improvements to the fidelity of two-qubit operations and be extended to three or four qubits.

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  • Received 18 February 2010

DOI:https://doi.org/10.1103/PhysRevA.81.062325

©2010 American Physical Society

Authors & Affiliations

J. M. Chow1, L. DiCarlo1, J. M. Gambetta2, A. Nunnenkamp1, Lev S. Bishop1, L. Frunzio1, M. H. Devoret1, S. M. Girvin1, and R. J. Schoelkopf1

  • 1Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA
  • 2Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

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Vol. 81, Iss. 6 — June 2010

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