Quantum field state measurement and reconstruction in a cavity by quantum nondemolition photon counting

M. Brune, I. Dotsenko, S. Deleglise, C. Sayrin, X. Zhou, S. Gleyzes, C. Guerlin, S. Kuhr, J. M. Raimond, S. Haroche, H Katori (Editor), H Yoneda (Editor), K Nakagawa (Editor), F Shimizu (Editor)

Research output: Contribution to conferencePaperpeer-review


Quantum nondemolition photon (QND) counting in a high Q cavity is performed by using circular Rydberg atoms. The atoms behave as clocks whose ticking rate is affected by light shifts induced by the cavity field. Measurning the atoms projects the field on non-classical states such as number states or Schrodinger cat states. We also use the QND measurement method for reconstructing the Wigner function of these states and to monitor their decoherence. These field manipulation methods can be applied to state preparation by quantum feedback and to demonstrate non locality with two fields located in separated cavities.
Original languageEnglish
Number of pages10
Publication statusPublished - 2010
Event19th International Conference on Laser Spectroscopy - Kussharo, Japan
Duration: 7 Jun 200912 Jun 2009


Conference19th International Conference on Laser Spectroscopy


  • quantum measurement
  • decohernence
  • Rydberg atoms
  • Cavity QED
  • schrodinger-cat states
  • generation
  • decoherence

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