General paradigm for distilling classical key from quantum states
IEEE Transactions on Information Theory
A few steps more towards NPT bound entanglement
IEEE Transactions on Information Theory
Security of quantum key distribution with state-dependent imperfections
Quantum Information & Computation
Hi-index | 754.96 |
In this paper, we prove unconditional security for a quantum key distribution (QKD) protocol based on distilling pbits (twisted ebits) from an arbitrary untrusted state that is claimed to contain distillable key. Our main result is that we can verify security using only public communication-via parameter estimation of the given untrusted state. The technique applies even to bound-entangled states, thus extending QKD to the regime where the available quantum channel has zero quantum capacity. We also show how to convert our purification-based QKD schemes to prepare/measure schemes.