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Phys. Rev. Lett. 91, 097906 (2003) [4 pages]

Continuous Monitoring of Rabi Oscillations in a Josephson Flux Qubit

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E. Il’ichev1, N. Oukhanski1, A. Izmalkov1,2, Th. Wagner1, M. Grajcar3,4, H.-G. Meyer1, A. Yu. Smirnov5, Alec Maassen van den Brink5, M. H. S. Amin5, and A. M. Zagoskin5,6,*
1Institute for Physical High Technology, P.O. Box 100239, D-07702 Jena, Germany
2Moscow Engineering Physics Institute (State University), Kashirskoe shosse 31, 115409 Moscow, Russia
3Department of Solid State Physics, Comenius University, SK-84248 Bratislava, Slovakia
4Friedrich Schiller University, Institute of Solid State Physics, D-07743 Jena, Germany
5D-Wave Systems Inc., 320-1985 W. Broadway, Vancouver, British Columbia, V6J 4Y3, Canada
6Physics and Astronomy Department, The University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1, Canada

Received 21 March 2003; published 28 August 2003

Under resonant irradiation, a quantum system can undergo coherent (Rabi) oscillations in time. We report evidence for such oscillations in a continuously observed three-Josephson-junction flux qubit, coupled to a high-quality tank circuit tuned to the Rabi frequency. In addition to simplicity, this method of Rabi spectroscopy enabled a long coherence time of about 2.5   μs, corresponding to an effective qubit quality factor ∼7000.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.097906
DOI:
10.1103/PhysRevLett.91.097906
PACS:
03.67.Lx, 74.50.+r, 85.25.Cp, 85.25.Dq

*Electronic address: zagoskin@dwavesys.com

 
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