Noiseless suppression of losses in optical quantum communication with conventional on-off photon detectors

摘要

The losses in a bosonic channel are the primary source of errors in current optic quantum communications.nAstonishingly, by combining the noiseless attenuation and noiseless linear amplification, Miˇcuda et al. showednthat the unavoidable losses in optic links can be compensated in a nondeterministically but heralded wayn(M. Micuda, I. Straka, M. Mikova, M. Dusek, N. J. Cerf, J. Fiurasek, and M. Jezek, arXiv:1206.2852). Here wenanalyze their noiseless loss suppression scheme in a more realistic scenario in which conventional on-off photonndetectors as well as the heralded single photon are involved. We use the Wigner function method and investigatenthe performance of loss suppression in all Fock state space. The noiseless loss suppression for transmitting a weakncoherent and single-mode squeezing state are investigated. All these results show that the noiseless attenuationnand noiseless linear amplification, if combined, could help to eliminate the channel loss and could be beneficialnin future quantum communication.