Tunable Coupling in Circuit Quantum Electrodynamics Using a Superconducting Charge Qubit with a V-Shaped Energy Level Diagram

S. J. Srinivasan, A. J. Hoffman, J. M. Gambetta, and A. A. Houck
Phys. Rev. Lett. 106, 083601 – Published 22 February 2011

Abstract

We introduce a new type of superconducting charge qubit that has a V-shaped energy spectrum and uses quantum interference to provide independently tunable qubit energy and coherent coupling to a superconducting cavity. Dynamic access to the strong coupling regime is demonstrated by tuning the coupling strength from less than 200 kHz to greater than 40 MHz. This tunable coupling can be used to protect the qubit from cavity-induced relaxation and avoid unwanted qubit-qubit interactions in a multiqubit system.

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  • Received 29 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.083601

© 2011 American Physical Society

Authors & Affiliations

S. J. Srinivasan1, A. J. Hoffman1, J. M. Gambetta2, and A. A. Houck1

  • 1Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 2Institute for Quantum Computing and Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

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Issue

Vol. 106, Iss. 8 — 25 February 2011

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