Experimental Semi-quantum Key Distribution With Classical Users

Francesco Massa1, Preeti Yadav2,3, Amir Moqanaki1, Walter O. Krawec4, Paulo Mateus2,3, Nikola Paunković2,3, André Souto2,5, and Philip Walther1

1University of Vienna, Faculty of Physics, Vienna Center for Quantum Science and Technology (VCQ), Boltzmanngasse 5, Vienna A-1090, Austria
2Instituto de Telecomunicações, 1049-001 Lisbon, Portugal
3Departamento de Matemática, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
4Computer Science and Engineering Department, University of Connecticut, Storrs, CT 06269, USA
5LASIGE, Departamento de Informática, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal

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Abstract

Quantum key distribution, which allows two distant parties to share an unconditionally secure cryptographic key, promises to play an important role in the future of communication. For this reason such technique has attracted many theoretical and experimental efforts, thus becoming one of the most prominent quantum technologies of the last decades. The security of the key relies on quantum mechanics and therefore requires the users to be capable of performing quantum operations, such as state preparation or measurements in multiple bases. A natural question is whether and to what extent these requirements can be relaxed and the quantum capabilities of the users reduced. Here we demonstrate a novel quantum key distribution scheme, where users are fully classical. In our protocol, the quantum operations are performed by an untrusted third party acting as a server, which gives the users access to a superimposed single photon, and the key exchange is achieved via interaction-free measurements on the shared state. We also provide a full security proof of the protocol by computing the secret key rate in the realistic scenario of finite-resources, as well as practical experimental conditions of imperfect photon source and detectors. Our approach deepens the understanding of the fundamental principles underlying quantum key distribution and, at the same time, opens up new interesting possibilities for quantum cryptography networks

Quantum key distribution (QKD) is one of the most promising quantum technologies, as it enables
unconditionally secure transmission of a cryptographic key between two parties. This technique typically requires at least one of the parties to be capable of performing quantum operations. In this work, we describe, implement and prove the security of a novel QKD scheme in which the two parties are fully classical and the quantum operations are delegated to an untrusted server providing single photons in superposition. Our method constitutes a novel approach to the QKD problem and sets a base for the development of a centralized QKD network.

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Cited by

[1] Hasan Iqbal and Walter O. Krawec, "Semi-quantum cryptography", Quantum Information Processing 19 3, 97 (2020).

[2] Julia Guskind and Walter O. Krawec, "Mediated semi-quantum key distribution with improved efficiency", Quantum Science and Technology 7 3, 035019 (2022).

[3] Flavio Del Santo and Borivoje Dakić, "Coherence Equality and Communication in a Quantum Superposition", Physical Review Letters 124 19, 190501 (2020).

[4] Lingli Chen, Qin Li, Chengdong Liu, Yu Peng, and Fang Yu, "Efficient mediated semi-quantum key distribution", Physica A Statistical Mechanics and its Applications 582, 126265 (2021).

[5] Zhenbang Rong, Daowen Qiu, Paulo Mateus, and Xiangfu Zou, "Mediated semi-quantum secure direct communication", Quantum Information Processing 20 2, 58 (2021).

[6] Mário Silva, Ricardo Faleiro, and Paulo Mateus, "Semi-device-independent quantum key distribution based on a coherence equality", arXiv:2103.06829.

[7] Walter O. Krawec, "Security of a High Dimensional Two-Way Quantum Key Distribution Protocol", arXiv:2203.02989.

[8] Walter O. Krawec, Rotem Liss, and Tal Mor, "Security Proof Against Collective Attacks for an Experimentally Feasible Semi-Quantum Key Distribution Protocol", arXiv:2012.02127.

[9] Saachi Mutreja and Walter O. Krawec, "Improved semi-quantum key distribution with two almost-classical users", Quantum Information Processing 21 9, 319 (2022).

[10] Chia-Wei Tsai and Chun-Wei Yang, "Lightweight mediated semi-quantum key distribution protocol with a dishonest third party based on Bell states", Scientific Reports 11, 23222 (2021).

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