AI Article Synopsis
- The Gaussian-modulated coherent state (GMCS) is an effective quantum key distribution method that manages background noise and ambient light well, but it's challenging to apply in free space with current polarization techniques.
- A new polarization coding system utilizing a self-compensating fiber Sagnac interferometer has been proposed, allowing for significantly lower voltage requirements and rapid polarization changes.
- This innovative setup, made from readily available fiber components, is compact and practical for mobile devices, potentially paving the way for practical applications in various technologies.
Article Abstract
The Gaussian-modulated coherent state (GMCS) is a well-known continuous-variable quantum key distribution (CV-QKD) protocol that is robust to incoherent background noise and can effectively suppress ambient light in free space. However, it is difficult to implement this protocol in free space using existing polarization coding schemes. In this Letter, we propose a polarization coding structure based on a self-compensating fiber Sagnac interferometer, which can reduce the required modulation voltage by two orders of magnitude and achieve fast and arbitrary polarization modulation, and experimentally demonstrate polarization coding-based GMCS CV-QKD for, it is believed, the first time. The proposed polarization modulation structure, which uses off-the-shelf fiber components, is compact, simple, and suitable for mobile terminals, such as flying lifts.
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| http://dx.doi.org/10.1364/OL.502897 | DOI Listing |
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