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Higher-rate quantum key expansion scheme

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Abstract

The paper describes a quantum technique for relativistic high-dimensional key distribution without public announcement of bases, also known as quantum key expansion, which securely transfers 2 bits per setup usage given that a pre-shared bit is at disposal to the parties. This becomes possible by utilizing both phase and polarization encodings. The work presents both single-photon and weak-coherent-state interferometric setups for the purpose of the proposed scheme. The proposed key distribution is characterized with higher rate than any existing protocols of such type. Also, the proposed scheme has the highest efficiency of the existing quantum key expansion protocols. It should be noted that the highest efficiency is obtained only for the case of single-photon regime of the scheme; the weak-coherent-pulse regime manifests lower efficiency. Moreover, compared to other relativistic quantum key distribution schemes, the proposed one shows better rate and efficiency (weak-coherent-pulse regime is considered). The improvement comes at no security cost. However, at the cost of improving efficiency and rate, the practicality of the scheme reduces.

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Data Availability

Detailed Table 1 is available from the corresponding author on reasonable request. No other data sharing is applicable to this article as no additional datasets were generated or analysed during the current work.

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Acknowledgements

The work is supported by the project \(\hbox {K}\Pi \)-06-H37/18 /06.12.2019, funded by National Science Fund, Ministry of Education and Science, Bulgaria.

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  1. Technical University of Varna, 1 Studentska Str, 9010, Varna, Bulgaria

    Georgi Bebrov

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  1. Georgi Bebrov
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Correspondence to Georgi Bebrov.

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Bebrov, G. Higher-rate quantum key expansion scheme. Quantum Inf Process 21, 202 (2022). https://doi.org/10.1007/s11128-022-03543-4

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