{"id":2410,"date":"2024-04-04T18:14:00","date_gmt":"2024-04-04T14:44:00","guid":{"rendered":"https:\/\/psi-net.ir\/?p=2410"},"modified":"2024-04-19T23:25:35","modified_gmt":"2024-04-19T19:55:35","slug":"long-distance-continuous-variable-quantum-key-distribution-over-100-km-fiber-with-local-local-oscillator","status":"publish","type":"post","link":"https:\/\/psi-net.ir\/en\/long-distance-continuous-variable-quantum-key-distribution-over-100-km-fiber-with-local-local-oscillator\/","title":{"rendered":"Long-distance continuous-variable quantum key distribution over 100-km fiber with local local oscillator"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Quantum key distribution (QKD) enables two remote parties to share encryption keys with security based on the laws of physics. Continuous-variable (CV) QKD with coherent states and coherent detection integrates well with existing telecommunication networks. Thus far, long-distance CV-QKD has only been demonstrated using a highly complex scheme where the local oscillator is transmitted, opening security loopholes for eavesdroppers and limiting potential applications. Here, we report a long-distance CV-QKD experiment with a locally generated local oscillator over a 100-kilometer fiber channel with a total loss of 15.4 decibels. This record-breaking distance is achieved by controlling the phase noise\u2013induced excess noise through a machine learning framework for carrier recovery and optimizing the modulation variance. We implement the full CV-QKD protocol and demonstrate the generation of keys secure against collective attacks in the finite-size regime. Our results mark a substantial milestone for realizing CV quantum access networks with a high loss budget and pave the way for large-scale deployment of secure QKD.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quantum key distribution (QKD) enables two remote parties to share encryption keys with security based on the laws of physics. Continuous-variable (CV) QKD with coherent states and coherent detection integrates well with existing telecommunication networks. Thus far, long-distance CV-QKD has only been demonstrated using a highly complex scheme where the local oscillator is transmitted, opening [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2240,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2410","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-1"],"_links":{"self":[{"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/posts\/2410","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/comments?post=2410"}],"version-history":[{"count":1,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/posts\/2410\/revisions"}],"predecessor-version":[{"id":2411,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/posts\/2410\/revisions\/2411"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/media\/2240"}],"wp:attachment":[{"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/media?parent=2410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/categories?post=2410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/psi-net.ir\/en\/wp-json\/wp\/v2\/tags?post=2410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}