Quantum Enigma Machines and the Locking Capacity of a Quantum Channel by Guha, Saikat, Hayden, Patrick, Krovi, Hari, Lloyd, Seth, Lupo, Cosmo, Shapiro, Jeffrey H., Takeoka, Masahiro, Wilde, Mark M.

“…The locking effect is a phenomenon that is unique to quantum information theory and represents one of the strongest separations between the classical and quantum theories of information. The Fawzi-Hayden-Sen locking protocol harnesses this effect in a cryptographic context, whereby one party can encode n bits into n qubits while using only a constant-size secret key. …”
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