Noiseless Loss Suppression in Quantum Optical Communication
Michal Mičuda, Ivo Straka, Martina Miková, Miloslav Dušek, Nicolas J. Cerf, Jaromı́r Fiurášek, Miroslav Ježek · Physical Review Letters · 2012
We propose a protocol for conditional suppression of losses in direct quantum state transmission over a lossy quantum channel. The method works by noiselessly attenuating the input state prior to transmission through a lossy channel followed by noiseless amplification of the output state. The procedure does not add any noise; hence, it keeps quantum coherence. We experimentally demonstrate it in the subspace spanned by vacuum and single-photon states, and consider its general applicability.