Quantum Key Distillation from Gaussian States by Gaussian Operations
Quantum Key Distillation from Gaussian States by Gaussian Operations
We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with nonpositive partial transposition. Moreover, all such states allow for key …