Continuous-Variable Quantum Key Distribution Protocols Over Noisy Channels

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Abstract / Description of output

A continuous-variable quantum key distribution protocol based on squeezed states and heterodyne detection is introduced and shown to attain higher secret key rates over a noisy line than any other one-way Gaussian protocol. This increased resistance to channel noise can be understood as resulting from purposely adding noise to the signal that is converted into the secret key. This notion of noise-enhanced tolerance to noise also provides a better physical insight into the poorly understood discrepancies between the previously defined families of Gaussian protocols.
Original languageEnglish
Article number130501
Number of pages4
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 31 Mar 2009


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