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Phys. Rev. B 81, 134514 (2010) [5 pages]

Mesoscopic shelving readout of superconducting qubits in circuit quantum electrodynamics

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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

Received 16 November 2009; revised 8 March 2010; published 14 April 2010

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.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.134514
DOI:
10.1103/PhysRevB.81.134514
PACS:
03.65.Yz, 03.65.Wj, 03.67.Lx, 42.50.Lc

*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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