Towards a global continuous variable quantum key distribution network

Mikhael Sayat; Sebastian P. Kish; Ping Koy Lam; Nicholas Rattenbury; John Cater

doi:10.1117/12.3001444

13 March 2024 Towards a global continuous variable quantum key distribution network

Mikhael Sayat, Sebastian P. Kish, Ping Koy Lam, Nicholas Rattenbury, John Cater

Proceedings Volume 12911, Quantum Computing, Communication, and Simulation IV; 129110B (2024) https://doi.org/10.1117/12.3001444
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

Continuous variable quantum key distribution (CVQKD) uses the continuous quadratures of light to share a secret key between a transmitter and receiver. The presence of an eavesdropper can be detected by fundamental quantum mechanics. Compared to the more established discrete variable QKD, CVQKD uses more cost-effective homodyne detectors which are more compatible with current telecommunication technologies. In a future global quantum network, CVQKD could be used to ensure the secure exchange of information. In this work, the feasibility of a variety of CVQKD protocols in different channels that could be used to establish a global quantum network are studied. These are the Gaussian modulated and discrete modulated CVQKD protocols for satellite to optical ground station downlinks and uplinks for Earth-space connections, inter-satellite links for space connections, satellite to ship and underwater links for maritime connections, and fibre network links for terrestrial connections. Secret key distribution between continents and various regions is simulated while accounting for the different adverse effects associated with each link. The combination of these connections with routing and scheduling ensures inter-continental high-speed information exchange with unconditional security that is required to achieve the goal of a global quantum network.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Mikhael Sayat, Sebastian P. Kish, Ping Koy Lam, Nicholas Rattenbury, and John Cater "Towards a global continuous variable quantum key distribution network", Proc. SPIE 12911, Quantum Computing, Communication, and Simulation IV, 129110B (13 March 2024); https://doi.org/10.1117/12.3001444

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