Bidirectional quantum key distribution protocol with practical faint laser pulses

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Experimental quantum secure direct communication with single photons (2015, background): “32,33,34 Based on DL04N1, Deng et al constructed a circular quantum secret sharing protocol, 35 which has been experimentally demonstrated by Jin et al over 50 km in fibers.”
Advances in quantum cryptography (2019, unknown): “Quantum cryptographic protocols making a bidirectional use of quantum channels started with the introduction of deterministic protocols for the purpose of secure direct communication [118–120] and later evolved into more mature schemes of two-way QKD [121, 122].”