Continuous-variable quantum enigma machines for long-distance key distribution
Name
PhysRevA.92.062312.pdf
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384.33 KB
Format
Adobe PDF
Checksum (MD5)
adbf6935a925f316476fee310155f1e0
Author(s)
Lupo, Cosmo
Lloyd, Seth
Date Issued
December 2015
Journal
Physical Review A
Publisher
American Physical Society
Citation
Lupo, Cosmo, and Seth Lloyd. "Continuous-variable quantum enigma machines for long-distance key distribution." Phys. Rev. A 92, 062312 (December 2015). © 2015 American Physical Society
Version
Final published version
Abstract
Quantum physics allows for unconditionally secure communication through insecure communication channels. The achievable rates of quantum-secured communication are fundamentally limited by the laws of quantum physics and in particular by the properties of entanglement. For a lossy communication line, this implies that the secret-key generation rate vanishes at least exponentially with the communication distance. We show that this fundamental limitation can be violated in a realistic scenario where the eavesdropper can store quantum information for only a finite, yet arbitrarily long, time. We consider communication through a lossy bononic channel (modeling linear loss in optical fibers) and we show that it is in principle possible to achieve a constant rate of key generation of one bit per optical mode over arbitrarily long communication distances.
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/PhysRevA.92.062312
