Capture and release of a conditional state of a cavity QED system by quantum feedback

W P Smith, J E Reiner, L A Orozco, S Kuhr, H M Wiseman

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Detection of a single photon escaping an optical cavity QED system prepares a nonclassical state of the electromagnetic field. The evolution of the state can be modified by changing the drive of the cavity. For the appropriate feedback, the conditional state can be captured (stabilized) and then released. This is observed by a conditional intensity measurement that shows suppression of vacuum Rabi oscillations for the length of the feedback pulse and their subsequent return.

Original languageEnglish
Article number133601
Number of pages4
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 23 Sep 2002


  • capture and release
  • conditional state
  • cavity QED system
  • quantum feedback
  • single photon
  • optical cavity QED system
  • electromagnetic field

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