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Negative Full Counting Statistics Arise from Interference Effects

Author:
  • Patrick P. Hofer
  • A. A. Clerk
Publishing year: 2016-01-07
Language: English
Publication/Series: Physical Review Letters
Volume: 116
Issue: 1
Document type: Journal article
Publisher: American Physical Society

Abstract english

The Keldysh-ordered full counting statistics is a quasiprobability distribution describing the fluctuations of a time-integrated quantum observable. While it is well known that this distribution can fail to be positive, the interpretation and origin of this negativity has been somewhat unclear. Here, we show how the full counting statistics can be tied to trajectories through Hilbert space, and how this directly connects negative quasiprobabilities to an unusual interference effect. Our findings are illustrated with the example of energy fluctuations in a driven bosonic resonator; we discuss how negative quasiprobability here could be detected experimentally using superconducting microwave circuits.

Other

Published
  • ISSN: 0031-9007
Portrait of Patrick Potts
E-mail: patrick [dot] potts [at] teorfys [dot] lu [dot] se

Postdoctoral fellow

Mathematical Physics

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Postdoctoral fellow

NanoLund

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