A simple fundamental modification of quantum key distribution protocols has been proposed: it is not required to protect the results of avalanche detectors from an eavesdropper, but all cryptographic properties of a protocol hold.
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Notes
To avoid misunderstanding, we note that the consideration below concerns the standard point–point configuration rather than twin-field quantum cryptography systems (see below).
The idea of interference of states from different sources in quantum key distribution was proposed as early as in 1997 in [5]; this system was called quantum key distribution based on a quantum computer.
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S.P. Kulik acknowledges the support of the Interdisciplinary Scientific Educational School “Photon and Quantum Technologies. Digital Medicine,” Moscow State University.
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Translated by R. Tyapaev
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Balygin, K.A., Kulik, S.P. & Molotkov, S.N. Quantum Key Distribution with Untrusted Detectors Accessible to an Eavesdropper. Jetp Lett. 116, 128–132 (2022). https://doi.org/10.1134/S0021364022601142
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DOI: https://doi.org/10.1134/S0021364022601142