Secrecy of Bipartite Quantum Channels with Local Environment Assistance
Joonwoo Bae · arXiv (Cornell University) · 2008
We investigate secrecy properties of bipartite quantum channels when local environment called shield system is assisted. Two honest parties apply either the classical distillation such as the standard one-way postprocessing followed by the advantage distillation (AD), or the quantum distillation applying the recurrence protocol. We then identify those entangled states that can be converted to secrecy by either the quantum or the classical distillation. Remarkably much wider range of bound entangled states are shown to be distilled to secrecy.