Coherent Temporal Oscillations of Macroscopic Quantum States in a Josephson Junction

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Science  03 May 2002:
Vol. 296, Issue 5569, pp. 889-892
DOI: 10.1126/science.1069452

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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.

  • * To whom correspondence and requests should be addressed. E-mail: han{at}

  • 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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