Effects of damping and reamplification of pure number states

J. Janszky, T. Kobayashi

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It is shown that in accordance with the results of Ning Lu [Phys. Rev. A 40, 1707 (1989)] the photon number state and the squeezed vacuum state are much more vulnerable to small loss than the coherent state. Furthermore, unlike the coherent state, they do not recover when the loss is compensated by a subsequent amplification. It is also shown that the Wigner function retains essential information about the original photon number of a decaying number state up to a loss of 1/2 of the original energy.

Original languageEnglish
Pages (from-to)4074-4076
Number of pages3
JournalPhysical Review A
Issue number7
Publication statusPublished - Jan 1 1990


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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