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• W1485726418 abstract "Computational encryption, information-theoretic secrecy and quantum cryptography offer progressively stronger security against unauthorized decoding of messages contained in communication transmissions. However, these approaches do not ensure stealth--that the mere presence of message-bearing transmissions be undetectable. We characterize the ultimate limit of how much data can be reliably and covertly communicated over the lossy thermal-noise bosonic channel (which models various practical communication channels). We show that whenever there is some channel noise that cannot in principle be controlled by an otherwise arbitrarily powerful adversary--for example, thermal noise from blackbody radiation--the number of reliably transmissible covert bits is at most proportional to the square root of the number of orthogonal modes (the time-bandwidth product) available in the transmission interval. We demonstrate this in a proof-of-principle experiment. Our result paves the way to realizing communications that are kept covert from an all-powerful quantum adversary." @default.
• W1485726418 created "2016-06-24" @default.
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• W1485726418 date "2015-10-19" @default.
• W1485726418 modified "2023-10-13" @default.
• W1485726418 title "Quantum-secure covert communication on bosonic channels" @default.
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• W1485726418 doi "https://doi.org/10.1038/ncomms9626" @default.
• W1485726418 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4667704" @default.
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• W1485726418 hasPublicationYear "2015" @default.
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