Alexander Semenovich Holevo

Bosonic Quantum Communication Across Arbitrarily High Loss Channels

2020 · Physical Review Letters

A general attenuator ${\mathrm{\ensuremath{\Phi}}}_{\ensuremath{\lambda},\ensuremath{\sigma}}$ is a bosonic quantum channel that acts by combining the input with a fixed environment state $\ensuremath{\sigma}$ in a beam splitter of transmissivity $\ensuremath{\lambda}$. If $\ensuremath{\sigma}$ is a thermal state, the …