Quantum-Locked Key Distribution at Nearly the Classical Capacity Rate
Name
PhysRevLett.113.160502.pdf
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143.91 KB
Format
Adobe PDF
Checksum (MD5)
e9796e6cd6267b3ec4fcbd87c484e29d
Author(s)
Lupo, Cosmo
Lloyd, Seth
Date Issued
October 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Lupo, Cosmo, and Seth Lloyd. "Quantum-Locked Key Distribution at Nearly the Classical Capacity Rate." Phys. Rev. Lett. 113, 160502 (October 2014). © 2014 American Physical Society
Version
Final published version
Abstract
Quantum data locking is a protocol that allows for a small secret key to (un)lock an exponentially larger amount of information, hence yielding the strongest violation of the classical one-time pad encryption in the quantum setting. This violation mirrors a large gap existing between two security criteria for quantum cryptography quantified by two entropic quantities: the Holevo information and the accessible information. We show that the latter becomes a sensible security criterion if an upper bound on the coherence time of the eavesdropper’s quantum memory is known. Under this condition, we introduce a protocol for secret key generation through a memoryless qudit channel. For channels with enough symmetry, such as the d-dimensional erasure and depolarizing channels, this protocol allows secret key generation at an asymptotic rate as high as the classical capacity minus one bit.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.160502
