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Patrick Potts

Postdoctoral fellow

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Negative Full Counting Statistics Arise from Interference Effects

Author

  • Patrick P. Hofer
  • A. A. Clerk

Summary, in 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.

Publishing year

2016-01-07

Language

English

Publication/Series

Physical Review Letters

Volume

116

Issue

1

Document type

Journal article

Publisher

American Physical Society

Status

Published

ISBN/ISSN/Other

  • ISSN: 0031-9007