Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution

Ry Render; Ben Amies-King; Rupesh Kumar; Marco Lucamarini

doi:10.1007/978-3-031-73122-8_8

Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution

Ry Render^*, Ben Amies-King, Rupesh Kumar, Marco Lucamarini

^*Corresponding author for this work

Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Quantum key distribution (QKD) has been demonstrated in free space over long horizontal and vertical channels using the polarisation of light as an encoding degree of freedom. The optical phase of light, however, promises better performance for QKD than polarisation, due to the recent introduction of a new phase-based protocol called ‘twin-field’ (TF) QKD. The implementation of TF-QKD on a free-space channel requires precise temporal and spatial phase stabilisation, which has not yet been simultaneously tested for this protocol. We experimentally performed this test using a hybrid interferometer with free-space and fibre-based arms. Our results demonstrate real-time phase stabilisation of the system, enabling the application of TF-QKD over hybrid quantum networks that include both free-space and fibre-based channels.

Original language	English
Title of host publication	Proceedings of the Future Technologies Conference (FTC) 2024
Editors	Kohei Arai
Publisher	Springer Science and Business Media Deutschland GmbH
Pages	111-125
Number of pages	15
ISBN (Print)	9783031731211
DOIs	https://doi.org/10.1007/978-3-031-73122-8_8
Publication status	Published - 5 Nov 2024
Event	9th Future Technologies Conference, FTC 2024 - London, United Kingdom Duration: 14 Nov 2024 → 15 Nov 2024

Publication series

Name	Lecture Notes in Networks and Systems
Volume	1155 LNNS
ISSN (Print)	2367-3370
ISSN (Electronic)	2367-3389

Conference

Conference	9th Future Technologies Conference, FTC 2024
Country/Territory	United Kingdom
City	London
Period	14/11/24 → 15/11/24

Bibliographical note

Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

Keywords

Adaptive optics
Phase encoding
Quantum key distribution

Access to Document

10.1007/978-3-031-73122-8_8

Cite this

Render, R., Amies-King, B., Kumar, R., & Lucamarini, M. (2024). Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution. In K. Arai (Ed.), Proceedings of the Future Technologies Conference (FTC) 2024 (pp. 111-125). (Lecture Notes in Networks and Systems; Vol. 1155 LNNS). Springer Science and Business Media Deutschland GmbH. https://doi.org/10.1007/978-3-031-73122-8_8

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title = "Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution",

abstract = "Quantum key distribution (QKD) has been demonstrated in free space over long horizontal and vertical channels using the polarisation of light as an encoding degree of freedom. The optical phase of light, however, promises better performance for QKD than polarisation, due to the recent introduction of a new phase-based protocol called {\textquoteleft}twin-field{\textquoteright} (TF) QKD. The implementation of TF-QKD on a free-space channel requires precise temporal and spatial phase stabilisation, which has not yet been simultaneously tested for this protocol. We experimentally performed this test using a hybrid interferometer with free-space and fibre-based arms. Our results demonstrate real-time phase stabilisation of the system, enabling the application of TF-QKD over hybrid quantum networks that include both free-space and fibre-based channels.",

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Render, R, Amies-King, B, Kumar, R & Lucamarini, M 2024, Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution. in K Arai (ed.), Proceedings of the Future Technologies Conference (FTC) 2024. Lecture Notes in Networks and Systems, vol. 1155 LNNS, Springer Science and Business Media Deutschland GmbH, pp. 111-125, 9th Future Technologies Conference, FTC 2024, London, United Kingdom, 14/11/24. https://doi.org/10.1007/978-3-031-73122-8_8

Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution. / Render, Ry; Amies-King, Ben; Kumar, Rupesh et al.
Proceedings of the Future Technologies Conference (FTC) 2024. ed. / Kohei Arai. Springer Science and Business Media Deutschland GmbH, 2024. p. 111-125 (Lecture Notes in Networks and Systems; Vol. 1155 LNNS).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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Render R, Amies-King B, Kumar R , Lucamarini M. Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution. In Arai K, editor, Proceedings of the Future Technologies Conference (FTC) 2024. Springer Science and Business Media Deutschland GmbH. 2024. p. 111-125. (Lecture Notes in Networks and Systems). doi: 10.1007/978-3-031-73122-8_8

Characterisation of Temporal and Spatial Phase in Free-Space Phase-Based Quantum Key Distribution

Abstract

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Keywords

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