AI Article Synopsis
- This study explores the use of bright multimode coherent states of light for continuous-variable quantum key distribution (QKD) and tests the effectiveness of homodyne detection.
- It demonstrates that signal modes can be effectively chosen by aligning them with a local oscillator, which helps reduce quadrature noise from unmatched modes.
- The findings suggest that a QKD protocol using these bright states is viable, especially when modulation is applied to either all modes or just the matched ones, paving the way for practical quantum communication systems similar to classical optics.
Article Abstract
We address feasibility of continuous-variable quantum key distribution using bright multimode coherent states of light and homodyne detection. We experimentally verify the possibility to properly select signal modes by matching them with the local oscillator and this way to decrease the quadrature noise concerned with unmatched bright modes. We apply the results to theoretically predict the performance of continuous-variable quantum key distribution scheme using multimode coherent states in scenarios where modulation is applied either to all the modes or only to the matched ones, and confirm that the protocol is feasible at high overall brightness. Our results open the pathway towards full-scale implementation of quantum key distribution using bright light, thus bringing quantum communication closer to classical optics.
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| http://dx.doi.org/10.1364/OE.27.036154 | DOI Listing |
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