Quantum Cryptography Approaching the Classical Limit
Name
Weedbrook-2010-Quantum Cryptography.pdf
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252.53 KB
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Checksum (MD5)
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Author(s)
Weedbrook, Christian
Pirandola, Stefano
Lloyd, Seth
Ralph, Timothy C.
Date Issued
September 2010
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Weedbrook, Christian et al. "Quantum Cryptography Approaching the Classical Limit." Physical Review Letters 105.11 (2010): 110501. © 2010 The American Physical Society
Version
Final published version
Abstract
We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender’s station becomes significantly noisy or thermal (even by as much as 10 (superscript 4) times greater than the variance of the vacuum mode). We show that, provided the channel transmission losses do not exceed 50%, the security of quantum cryptography is not dependent on the channel transmission, and is therefore incredibly robust against significant amounts of excess preparation noise. We extend these results to consider for the first time quantum cryptography at wavelengths considerably longer than optical and find that regions of security still exist all the way down to the microwave.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.105.110501
