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Macroscopic Quantum Coherence and Decoherence in Squids

In: Macroscopic Quantum Coherence and Quantum Computing

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  • A. J. Leggett

    (University of Illinois at Urbana-Champaign, Department of Physics)

Abstract

I consider the general problem of decoherence in Josephson systems, with particular reference to the question of how far we can reliably infer the degree of such decoherence, in an experiment of the MQC type, either by a priori order-of-magnitude arguments or from other types of experiment which may be easier at the initial stages of the program, such as measurements of dissipation in the quasiclassical regime or of tunnelling rates out of a metastablestate. Potential sources of decoherence which will be considered include normal electrons, phonons, nuclear spins, the radiation field and the “passing truck.” It is concluded that the effects of all but the last can be reaosnably estimated, and that there are good prospects (confirmed by recent experiments) of reducing them to manageable levels. The implications for the use of suchsystems for practical quantum computation are briefly considered.

Suggested Citation

  • A. J. Leggett, 2001. "Macroscopic Quantum Coherence and Decoherence in Squids," Springer Books, in: Dmitri V. Averin & Berardo Ruggiero & Paolo Silvestrini (ed.), Macroscopic Quantum Coherence and Quantum Computing, pages 1-6, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4615-1245-5_1
    DOI: 10.1007/978-1-4615-1245-5_1
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