Finite-size security of continuous-variable quantum key distribution with imperfect heterodyne measurement
Fuente:
arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913654926999552 |
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| author | Hajomer, Adnan A. E. Oruganti, Akash Nag Derkach, Ivan Andersen, Ulrik L Usenko, Vladyslav C Gehring, Tobias |
| author_facet | Hajomer, Adnan A. E. Oruganti, Akash Nag Derkach, Ivan Andersen, Ulrik L Usenko, Vladyslav C Gehring, Tobias |
| contents | Continuous-variable quantum key distribution (CVQKD) using coherent states and heterodyne detection enables secure quantum communication based on technology that has large similarities to coherent optical telecommunication. Yet, practical implementations of coherent receivers used in both technologies encounter device imperfections, which for CVQKD are often not addressed in security proofs. Here, we present a theoretical framework that rigorously accounts for imperfect heterodyne measurements arising from phase imbalances in the coherent (heterodyne) receiver. Focusing on collective attacks, we establish a finite-size security proof that reveals how measurement imperfections limit the distance over which a positive key rate is achievable. To mitigate these effects, we propose a local transformation during classical post-processing. We validate our approach experimentally on a CVQKD system with an imperfect coherent receiver, underscoring its potential for scalable, cost-effective CVQKD with photonic integrated receivers in which phase-imbalances naturally appear through manufacturing tolerances. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_10278 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Finite-size security of continuous-variable quantum key distribution with imperfect heterodyne measurement Hajomer, Adnan A. E. Oruganti, Akash Nag Derkach, Ivan Andersen, Ulrik L Usenko, Vladyslav C Gehring, Tobias Quantum Physics Optics Continuous-variable quantum key distribution (CVQKD) using coherent states and heterodyne detection enables secure quantum communication based on technology that has large similarities to coherent optical telecommunication. Yet, practical implementations of coherent receivers used in both technologies encounter device imperfections, which for CVQKD are often not addressed in security proofs. Here, we present a theoretical framework that rigorously accounts for imperfect heterodyne measurements arising from phase imbalances in the coherent (heterodyne) receiver. Focusing on collective attacks, we establish a finite-size security proof that reveals how measurement imperfections limit the distance over which a positive key rate is achievable. To mitigate these effects, we propose a local transformation during classical post-processing. We validate our approach experimentally on a CVQKD system with an imperfect coherent receiver, underscoring its potential for scalable, cost-effective CVQKD with photonic integrated receivers in which phase-imbalances naturally appear through manufacturing tolerances. |
| title | Finite-size security of continuous-variable quantum key distribution with imperfect heterodyne measurement |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2501.10278 |