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Covert communication offers a method to transmit messages in such a way thatit is not possible to detect that the communication is happening at all. Inthis work, we report an experimental demonstration of covert communication thatis provably secure against unbounded quantum adversaries. The covertcommunication is carried out over 10 km of optical fiber, addressing thechallenges associated with transmission over metropolitan distances. We deploythe protocol in a dense wavelength-division multiplexing infrastructure, whereour system has to coexist with a co-propagating C-band classical channel. Thenoise from the classical channel allows us to perform covert communication in aneighbouring channel. We perform an optimization of all protocol parameters andreport the transmission of three different messages with varying levels ofsecurity. Our results showcase the feasibility of secure covert communicationin a practical setting, with several possible future improvements from boththeory and experiment.

Experimental unconditionally secure covert communication in dense wavelength-division multiplexing networks