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Covert Communication over Classical-Quan...
Bullock, Michael S....

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Covert Communication over Classical-Quantum Channels by Bullock, Michael S. ( Author )
Lemonjar Open Access
N.A
25-01-2016
We investigate covert communication over general memoryless classical-quantum channels with fixed finite-size input alphabets. We show that the square root law (SRL) governs covert communication in this setting when product of n input states is used: LSRLn−−√+o(n−−√) covert bits (but no more) can be reliably transmitted in n uses of classical-quantum channel, where LSRL>0 is a channel-dependent constant that we call covert capacity. We also show that ensuring covertness requires JSRLn−−√+o(n−−√) bits secret shared by the communicating parties prior to transmission, where JSRL≥0 is a channel-dependent constant. We assume a quantum-powerful adversary that can perform an arbitrary joint (entangling) measurement on all n channel uses. We determine the single-letter expressions for LSRL and JSRL, and establish conditions when JSRL=0 (i.e., no pre-shared secret is needed). Finally, we evaluate the scenarios where covert communication is not governed by the SRL.
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Article
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36.88 KB
English
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MYR 0.01
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http://arxiv.org/abs/1601.06826
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