Stabilizing a Bell state of two superconducting qubits by dissipation engineering

Z. Leghtas, U. Vool, S. Shankar, M. Hatridge, S. M. Girvin, M. H. Devoret, and M. Mirrahimi
Phys. Rev. A 88, 023849 – Published 27 August 2013

Abstract

We propose a dissipation-engineering scheme that prepares and protects a maximally entangled state of a pair of superconducting qubits. This is done by off-resonantly coupling the two qubits to a low-Q cavity mode playing the role of a dissipative reservoir. We engineer this coupling by applying six continuous-wave microwave drives with appropriate frequencies. The two qubits need not be identical. We show that our approach does not require any fine-tuning of the parameters and requires only that certain ratios between them be large. With currently achievable coherence times, simulations indicate that a Bell state can be maintained over arbitrary long times with fidelities above 94%. Such performance leads to a significant violation of Bell's inequality (Clauser-Horne-Shimony-Holt correlation larger than 2.6) for arbitrary long times.

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  • Received 8 April 2013

DOI:https://doi.org/10.1103/PhysRevA.88.023849

©2013 American Physical Society

Authors & Affiliations

Z. Leghtas1,2, U. Vool1, S. Shankar1, M. Hatridge1, S. M. Girvin1, M. H. Devoret1, and M. Mirrahimi1,2

  • 1Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA
  • 2INRIA Paris-Rocquencourt, Domaine de Voluceau, Boîte Postale 105, 78153 Le Chesnay Cedex, France

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Issue

Vol. 88, Iss. 2 — August 2013

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