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Science 3 May 2002:
Vol. 296. no. 5569, pp. 889 - 892
DOI: 10.1126/science.1069452
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Reports

Coherent Temporal Oscillations of Macroscopic Quantum States in a Josephson Junction

Yang Yu,1 Siyuan Han,1* Xi Chu,2dagger Shih-I Chu,2 Zhen Wang3

We report the generation and observation of coherent temporal oscillations between the macroscopic quantum states of a Josephson tunnel junction by applying microwaves with frequencies close to the level separation. Coherent temporal oscillations of excited state populations were observed by monitoring the junction's tunneling probability as a function of time. From the data, the lower limit of phase decoherence time was estimated to be about 5 microseconds.

1 Department of Physics and Astronomy,
2 Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA.
3 Kansai Advanced Research Center, Communication Research Laboratory, Ministry of Posts and Telecommunications, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe, 651-24 Japan.
*   To whom correspondence and requests should be addressed. E-mail: han{at}ku.edu

dagger    Present address: Institute for Theoretical Atomic and Molecular Physics, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.

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