ua nt - p h / 05 06 10 8 v 1 1 4 Ju n 20 05 Squeezed Fock state by inconclusive photon subtraction
نویسنده
چکیده
We analyze in details the properties of the conditional state recently obtained by J. Wenger et al. [Phys. Rev. Lett. 92, 153601 (2004)] by means of inconclusive photon subtraction (IPS) on a squeezed vacuum state S(r)|0〉. The IPS process can be characterized by two parameters: the IPS transmissivity τ and the photodetection quantum efficiency η. We found that the conditional state approaches the squeezed Fock state S(r)|1〉 when τ, η → 1, i.e., in the limit of singlephoton subtraction. For non-unit IPS transmissivity and efficiency, the conditioned state remains close to the target state, i.e. shows a high fidelity for a wide range of experimental parameters. The nonclassicality of the conditional state is also investigated and a nonclassicality threshold on the IPS parameters is derived.
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