--- title: Northwestern University Researchers Demonstrate Quantum... description: Northwestern University researchers successfully distributed entangled photons over a 24.4-kilometer live metropolitan fiber-optic link between Evanston and... canonical: https://daily.dev/posts/northwestern-university-researchers-demonstrate-quantum-entanglement-over-busy-telecom-fiber-0hlkjclqd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber | daily.dev og:description: Northwestern University researchers successfully distributed entangled photons over a 24.4-kilometer live metropolitan fiber-optic link between Evanston and... og:url: https://daily.dev/posts/northwestern-university-researchers-demonstrate-quantum-entanglement-over-busy-telecom-fiber-0hlkjclqd og:image: https://api.daily.dev/og/posts/0hLkJcLQD.png og:image:alt: Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber **[The Quantum Insider](https://daily.dev/sources/thequantuminsider)** · 5 min read · 0 upvotes · 0 comments ## Summary Northwestern University researchers successfully distributed entangled photons over a 24.4-kilometer live metropolitan fiber-optic link between Evanston and downtown Chicago, while the same cable simultaneously carried up to 36 terabits-per-second of commercial internet traffic. The team achieved over 94% entanglement fidelity by transmitting quantum signals in the optical O-band to separate them from conventional C-band traffic, and used picosecond-level synchronization via the White Rabbit optical timing system to identify matching photon pairs in real time. This marks the first demonstration of entanglement distribution between remote nodes over fiber carrying modern commercial telecom traffic, supporting the viability of quantum networks built on existing infrastructure. Next steps include demonstrating full quantum teleportation between remote nodes on a live metropolitan network. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [NIST Researchers Demonstrate Entangled Photon Transmission Over Existing Fiber Networks](https://daily.dev/posts/nist-researchers-demonstrate-entangled-photon-transmission-over-existing-fiber-networks-bfwry5kbc) · The Quantum Insider · 0 upvotes · 0 comments - [Quantum Networking Beyond the Lab](https://daily.dev/posts/quantum-networking-beyond-the-lab-urd4afvut) · Cisco · 1 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/northwestern-university-researchers-demonstrate-quantum-entanglement-over-busy-telecom-fiber-0hlkjclqd) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber","url":"https://daily.dev/posts/northwestern-university-researchers-demonstrate-quantum-entanglement-over-busy-telecom-fiber-0hlkjclqd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/northwestern-university-researchers-demonstrate-quantum-entanglement-over-busy-telecom-fiber-0hlkjclqd"},"datePublished":"2026-07-23T07:50:13.094Z","dateModified":"2026-07-23T07:50:30.541Z","description":"Northwestern University researchers successfully distributed entangled photons over a 24.4-kilometer live metropolitan fiber-optic link between Evanston and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/20f87c104edf3df44d5a9124f72e0474?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/20f87c104edf3df44d5a9124f72e0474?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"The Quantum Insider","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"The Quantum Insider","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/7b14a6b34c1b464c9e8a88d9a0dac951","url":"https://daily.dev/sources/thequantuminsider"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/northwestern-university-researchers-demonstrate-quantum-entanglement-over-busy-telecom-fiber-0hlkjclqd","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Quantum Insider","item":"https://daily.dev/sources/thequantuminsider"},{"@type":"ListItem","position":3,"name":"Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber"}]} ```