Gaussian Operations and Privacy

Abstract

We consider the possibilities offered by Gaussian states and operations for two honest parties, Alice and Bob, to obtain privacy against a third eavesdropping party, Eve. We first extend the security analysis of the protocol proposed in M. Navascues et al., Phys. Rev. Lett. 94, 010502 (2005). Then, we prove that a generalized version of this protocol does not allow to distill a secret key out of bound entangled Gaussian states.

References in corpus (3)

• Non-gaussian statistics from individual pulses of squeezed light
• Relating quantum privacy and quantum coherence: an operational approach
• Key distillation from Gaussian states by Gaussian operations

Cited by in corpus (5)

• Quantum entanglement
• Additivity and multiplicativity properties of some Gaussian channels for Gaussian inputs
• Multipartite secret key distillation and bound entanglement
• Fundamental limitations to key distillation from Gaussian states with Gaussian operations
• Noisy dynamics of Gaussian entanglement: a transient bound entangled phase before separability