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Quantum data locking for high-rate private communication

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Publication details

JournalNew Journal of Physics
DatePublished - 12 Mar 2015
Original languageEnglish


We show that, if the accessible information is used as a security quantifier, quantum channels with a certain symmetry can convey private messages at a tremendously high rate, as high as less than one bit below the rate of non-private classical communication. This result is obtained by exploiting the quantum data locking effect. The price to pay to achieve such a high private communication rate is that accessible information security is in general not composable. However, composable security holds against an eavesdropper who is forced to measure her share of the quantum system within a finite time after she gets it.

    Research areas

  • quantum communication, quantum data locking, quantum enigma machine

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