Experimental free-space continuous-variable quantum key distribution with thermal source
| Autor: | Mingqi Zhang, Peng Huang, Ping Wang, Shurong Wei, Guihua Zeng |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Optics Letters. 48:1184 |
| ISSN: | 1539-4794 0146-9592 |
| Popis: | Passive-state-preparation (PSP) continuous-variable quantum key distribution (CVQKD) protocol explores the intrinsic field fluctuations of a thermal source. Compared with traditional Gaussian-modulated coherent-state CVQKD, it does not need active modulations and has promising applications in chip integration and portable free-space quantum key distribution. In this Letter, we propose and experimentally realize a PSP CVQKD scheme with transmitted local oscillator (LO) through fluctuating transmittance free-space channel using an off-the-shelf amplified spontaneous emission source for the first time. By proposing thermal-state polarization multiplexing transmitted LO, synchronized channel transmittance monitoring and fine-grained phase compensation techniques, secure keys within −15 dB transmittance of simulated free-space channel with turbulence are generated, with a final average secure key rate of 1.015 Mbps asymptotically. Equivalent atmospheric turbulence model analysis shows that the free-space PSP CVQKD scheme provides a promising outlook for high-speed and chip-based CVQKD for kilometer-level atmospheric channel networks. |
| Databáze: | OpenAIRE |
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