The role of squeezing in quantum key distribution based on homodyne detection and post-selection

Abstract

The role of squeezing in quantum key distribution with continuous variables based on homodyne detection and post-selection is investigated for several specific eavesdropping strategies. It is shown that amplitude squeezing creates strong correlations between the signals of the legitimate receiver and a potential eavesdropper. Post-selection of the received pulses can therefore be used to reduce the eavesdropper's knowledge of the raw key, which increases the secret key rate by orders of magnitude over large distances even for modest amounts of squeezing.

revised version: improved security analysis

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Cited by in corpus (4)

• Continuous variable B92 quantum key distribution protocol using single photon added and subtracted coherent states
• Quantum phase properties of photon added and subtracted displaced Fock states
• Quantum Key Distribution using Continuous-variable non-Gaussian States
• Quantum phase properties of a state driven by a classical field