Improving Free-Space Continuous Variable Quantum Key Distribution with Adaptive Optics
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912587581489152 |
|---|---|
| author | Sayat, Mikhael T. Birch, Marcus Copeland, Michael Jager, Elisa Thearle, Oliver Bennet, Francis Lam, Ping Koy Rattenbury, Nicholas J. Cater, John E. |
| author_facet | Sayat, Mikhael T. Birch, Marcus Copeland, Michael Jager, Elisa Thearle, Oliver Bennet, Francis Lam, Ping Koy Rattenbury, Nicholas J. Cater, John E. |
| contents | A significant performance inhibitor of free-space continuous variable quantum key distribution (CVQKD) is turbulence, which gives rise to wavefront phase and amplitude aberrations. We demonstrate that in a turbulent channel, during coherent state transmissions from a continuous-wave laser, that the interferometric visibility between the local oscillator (LO) and quantum signal decreases. A solution to this is incorporating adaptive optics at the receiver to correct phase and amplitude aberrations in the wavefronts of the received quantum signal. We demonstrate the increased interferometric visibility and decrease in its fluctuations in a 60 cm and 30 m turbulent channel when using adaptive optics through channel characterisation. In an ideal CVQKD system, we show that this leads to more precise and larger positive secret key rates, improving the performance of free-space CVQKD in turbulent channels. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_11759 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Improving Free-Space Continuous Variable Quantum Key Distribution with Adaptive Optics Sayat, Mikhael T. Birch, Marcus Copeland, Michael Jager, Elisa Thearle, Oliver Bennet, Francis Lam, Ping Koy Rattenbury, Nicholas J. Cater, John E. Quantum Physics A significant performance inhibitor of free-space continuous variable quantum key distribution (CVQKD) is turbulence, which gives rise to wavefront phase and amplitude aberrations. We demonstrate that in a turbulent channel, during coherent state transmissions from a continuous-wave laser, that the interferometric visibility between the local oscillator (LO) and quantum signal decreases. A solution to this is incorporating adaptive optics at the receiver to correct phase and amplitude aberrations in the wavefronts of the received quantum signal. We demonstrate the increased interferometric visibility and decrease in its fluctuations in a 60 cm and 30 m turbulent channel when using adaptive optics through channel characterisation. In an ideal CVQKD system, we show that this leads to more precise and larger positive secret key rates, improving the performance of free-space CVQKD in turbulent channels. |
| title | Improving Free-Space Continuous Variable Quantum Key Distribution with Adaptive Optics |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2509.11759 |