Coherent dynamics of a Josephson charge qubit

Duty, T., Gunnarsson, D., Bladh, K. and Delsing, P. (2004) Coherent dynamics of a Josephson charge qubit. Physical Review B, 69 14: 140503-1-140503-4. doi:10.1103/PhysRevB.69.140503

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Author Duty, T.
Gunnarsson, D.
Bladh, K.
Delsing, P.
Title Coherent dynamics of a Josephson charge qubit
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2004
Sub-type Article (original research)
DOI 10.1103/PhysRevB.69.140503
Open Access Status File (Publisher version)
Volume 69
Issue 14
Start page 140503-1
End page 140503-4
Total pages 4
Editor Adams, P. D.
Begley, A. M.
Place of publication Ridge, New York
Publisher The American Physical Society
Language eng
Subject 240000 Physical Sciences
Abstract We have fabricated a Josephson charge qubit by capacitively coupling a single-Cooper-pair box (SCB) to an electrometer based upon a single-electron transistor (SET) configured for radio-frequency readout (rf-SET). Charge quantization of 2e is observed and microwave spectroscopy is used to extract the Josephson and charging energies of the box. We perform coherent manipulation of the SCB by using very fast dc pulses and observe quantum oscillations in time of the charge that persist to ≃10 ns. The observed contrast of the oscillations is high and agrees with that expected from the finite EJ/EC ratio and finite rise time of the dc pulses. In addition, we are able to demonstrate nearly 100% initial charge state polarization. We also present a method to determine the relaxation time T1 when it is shorter than the measurement time
Keyword single-Cooper-pair box (SCB
single-electron transistor (SET)
Josephson charge qubit
Physics, Condensed Matter
Macroscopic Quantum States
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 127 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 04 Aug 2008, 09:51:57 EST by Thelma Whitbourne on behalf of School of Mathematics & Physics