Mr. Sam A. Markelon Profile

Sam A. Markelon

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Proceedings Article | 24 April 2020 Presentation + Paper

A semi-quantum extended B92 protocol and its analysis

Walter Krawec, Sam Markelon

Proceedings Volume 11391, 113910G (2020) https://doi.org/10.1117/12.2558200

KEYWORDS: Information security, Quantum communications, Quantum key distribution, Quantum information, Cryptography

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Unlike purely classical communication, unconditionally secure key distribution is possible if Alice and Bob are both equipped with quantum hardware. The degree to which a protocol needs to be quantum is not only an interesting theoretical question, but also important for practical implementations. Indeed, one may wish to construct cheaper devices, or compensate for device malfunction. In this sense, studying limited resource QKD protocols is an important problem. One direction to studying this is the semi-quantum model introduced by Boyer et al. in 2007 (PRL 99 140501). Several provably secure semi-quantum protocols were put forth. However, most of these protocols were proven secure in the perfect qubit scenario and not necessarily against practical attacks. Only recently, starting with seminal work of Boyer, Katz, Liss, and Mor in (PRA 96 062335) has research in the field of semi-quantum cryptography considered practical devices and imperfections, such as multi photon sources and imperfect detectors. In this work, we present a new SQKD protocol based on an Extended B92 protocol which is able to counter certain practical attacks. Furthermore, the techniques we use may see broad application to other limited-resource (S)QKD protocols.

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