Process tomography of field damping and measurement of fock state lifetimes by quantum nondemolition photon counting in a cavity

M. Brune, J. Bernu, C. Guerlin, S. Deleglise, C. Sayrin, S. Gleyzes, S. Kuhr, I. Dotsenko, J. M. Raimond, S. Haroche

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)
64 Downloads (Pure)


The relaxation of a quantum field stored in a high-Q superconducting cavity is monitored by nonresonant Rydberg atoms. The field, subjected to repetitive quantum nondemolition photon counting, undergoes jumps between photon number states. We select ensembles of field realizations evolving from a given Fock state and reconstruct the subsequent evolution of their photon number distributions. We realize in this way a tomography of the photon number relaxation process yielding all the jump rates between Fock states. The damping rates of the n photon states (0
Original languageEnglish
Number of pages4
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 12 Dec 2008


  • quantum process tomography
  • process tomography
  • field damping
  • fock state lifetimes
  • measurement

Cite this