Mesoscopic shelving readout of superconducting qubits in circuit quantum electrodynamics

B. G. U. Englert, G. Mangano, M. Mariantoni, R. Gross, J. Siewert, and E. Solano
Phys. Rev. B 81, 134514 – Published 14 April 2010

Abstract

We present a method for measuring the internal state of a superconducting qubit inside an on-chip microwave resonator. We show that one qubit state can be associated with the generation of an increasingly large cavity coherent field, while the other remains associated with the vacuum. By measuring the outgoing resonator field with conventional devices, an efficient single-shot QND-like qubit readout can be achieved, enabling a high-fidelity measurement in the spirit of the electron-shelving technique for trapped ions. We expect that the proposed ideas can be adapted to different superconducting qubit designs and contribute to the further improvement of qubit readout fidelity.

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  • Received 16 November 2009

DOI:https://doi.org/10.1103/PhysRevB.81.134514

©2010 American Physical Society

Authors & Affiliations

B. G. U. Englert1,2,3,*, G. Mangano4,5, M. Mariantoni1,3,†, R. Gross1,3, J. Siewert5,6,7, and E. Solano6,7

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meißner-Str. 8, D-85748 Garching, Germany
  • 2Physik Department, ASC and CeNS, Ludwig-Maximilians-Universität, Theresienstr. 37, D-80333 München, Germany
  • 3Physik Department, Technische Universität München, D-85748 Garching, Germany
  • 4MATIS-INFM and Dipartimento di Metodologie Fisiche e Chimiche (DMFCI), viale A. Doria 6, 95125 Catania, Italy
  • 5Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 6Departamento de Química Física, Universidad del País Vasco–Euskal Herriko Unibertsitatea, Apdo. 644, 48080 Bilbao, Spain
  • 7IKERBASQUE, Basque Foundation for Science, Alameda Urquijo 36, 48011 Bilbao, Spain

  • *Present address: Max-Planck-Institut für Quantenoptik, Hans- Kopfermann-Str. 1, D-85748 Garching, Germany.
  • Present address: Department of Physics, University of California, Santa Barbara, California 93106, USA.

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Vol. 81, Iss. 13 — 1 April 2010

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