Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links
We address the applicability of quantum key distribution with continuous-variable coherent and squeezed states over long-distance satellite-based links, considering low Earth orbits and taking into account strong varying channel attenuation, atmospheric turbulence and finite data ensemble size effec...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/23/1/55 |
| _version_ | 1797542893739573248 |
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| author | Ivan Derkach Vladyslav C. Usenko |
| author_facet | Ivan Derkach Vladyslav C. Usenko |
| author_sort | Ivan Derkach |
| collection | DOAJ |
| description | We address the applicability of quantum key distribution with continuous-variable coherent and squeezed states over long-distance satellite-based links, considering low Earth orbits and taking into account strong varying channel attenuation, atmospheric turbulence and finite data ensemble size effects. We obtain tight security bounds on the untrusted excess noise on the channel output, which suggest that substantial efforts aimed at setup stabilization and reduction of noise and loss are required, or the protocols can be realistically implemented over satellite links once either individual or passive collective attacks are assumed. Furthermore, splitting the satellite pass into discrete segments and extracting the key from each rather than from the overall single pass allows one to effectively improve robustness against the untrusted channel noise and establish a secure key under active collective attacks. We show that feasible amounts of optimized signal squeezing can substantially improve the applicability of the protocols allowing for lower system clock rates and aperture sizes and resulting in higher robustness against channel attenuation and noise compared to the coherent-state protocol. |
| first_indexed | 2024-03-10T13:36:59Z |
| format | Article |
| id | doaj.art-a0e890862fcf4ce79e58289d7f71e4de |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-10T13:36:59Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-a0e890862fcf4ce79e58289d7f71e4de2023-11-21T07:27:31ZengMDPI AGEntropy1099-43002020-12-012315510.3390/e23010055Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite LinksIvan Derkach0Vladyslav C. Usenko1Department of Optics, Palacky University, 771 46 Olomouc, Czech RepublicDepartment of Optics, Palacky University, 771 46 Olomouc, Czech RepublicWe address the applicability of quantum key distribution with continuous-variable coherent and squeezed states over long-distance satellite-based links, considering low Earth orbits and taking into account strong varying channel attenuation, atmospheric turbulence and finite data ensemble size effects. We obtain tight security bounds on the untrusted excess noise on the channel output, which suggest that substantial efforts aimed at setup stabilization and reduction of noise and loss are required, or the protocols can be realistically implemented over satellite links once either individual or passive collective attacks are assumed. Furthermore, splitting the satellite pass into discrete segments and extracting the key from each rather than from the overall single pass allows one to effectively improve robustness against the untrusted channel noise and establish a secure key under active collective attacks. We show that feasible amounts of optimized signal squeezing can substantially improve the applicability of the protocols allowing for lower system clock rates and aperture sizes and resulting in higher robustness against channel attenuation and noise compared to the coherent-state protocol.https://www.mdpi.com/1099-4300/23/1/55quantum cryptographyquantum opticsquantum key distributioncontinuous variablescoherent statessqueezed states |
| spellingShingle | Ivan Derkach Vladyslav C. Usenko Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links Entropy quantum cryptography quantum optics quantum key distribution continuous variables coherent states squeezed states |
| title | Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links |
| title_full | Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links |
| title_fullStr | Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links |
| title_full_unstemmed | Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links |
| title_short | Applicability of Squeezed- and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links |
| title_sort | applicability of squeezed and coherent state continuous variable quantum key distribution over satellite links |
| topic | quantum cryptography quantum optics quantum key distribution continuous variables coherent states squeezed states |
| url | https://www.mdpi.com/1099-4300/23/1/55 |
| work_keys_str_mv | AT ivanderkach applicabilityofsqueezedandcoherentstatecontinuousvariablequantumkeydistributionoversatellitelinks AT vladyslavcusenko applicabilityofsqueezedandcoherentstatecontinuousvariablequantumkeydistributionoversatellitelinks |