How Quantum Entanglement Survived a Live 24km Internet Cable
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📰 The quick summary: Scientists successfully sent entangled photons through a busy fiber-optic cable connecting Evanston and Chicago with over 94% fidelity, showing that future quantum networks could run on existing internet infrastructure.
📈 One key stat: Quantum entanglement survived with more than 94% fidelity through 24.4 kilometers of deployed fiber carrying 1.6 terabits per second of commercial internet traffic, proving that quantum and classical signals can share the same cable.
💬 One key quote: “We crossed a major bridge, showing we can do entanglement distribution,” said Prem Kumar, the study’s senior author and a professor at Northwestern’s McCormick School of Engineering.
1️⃣ The big picture: Researchers have successfully distributed quantum entanglement between two cities through an active fiber-optic cable already carrying high-speed commercial internet traffic. The 24.4-kilometer test linked Northwestern University’s Evanston campus to a communications exchange in downtown Chicago, with the quantum signal achieving over 94% fidelity despite sharing the cable with 1.6 terabits per second of data. To protect fragile quantum photons from interference, the team placed them in a quieter wavelength range and used narrow filters along with a precise optical timing system to match photon pairs detected at both ends. Published in Optica Quantum, this marks the first time entanglement has been distributed between remote nodes over deployed fiber carrying modern commercial telecommunications traffic. The results suggest that future quantum networks could be built on top of the infrastructure cities already use for the internet, rather than requiring entirely new fiber.
2️⃣ Why is this good news: Sharing existing fiber for quantum networking removes one of the biggest practical barriers to building real-world quantum networks, since laying new metropolitan fiber is expensive and existing cables are already in high demand. Telecommunications providers could potentially add quantum channels to their current networks without interrupting ordinary services, dramatically accelerating the path to practical quantum communication. Because the noise that quantum signals face depends on optical power and wavelength rather than data rate, classical capacity on the shared fiber could grow far beyond 1.6 terabits per second without making things harder for quantum signals. Demonstrating this in an active, real-world metropolitan environment rather than a controlled lab setting makes the findings far more meaningful for eventual deployment. Longer term, this lays the groundwork for quantum teleportation across cities, which could enable fundamentally more secure communication and entirely new capabilities in distributed quantum computing.
3️⃣ What’s next: The team now plans to attempt full quantum teleportation between Evanston and Chicago while the fiber continues to carry commercial traffic. Future experiments also need to cover longer distances and run continuously, rather than over several-hour test windows. Automated systems for correcting shifts in polarization and photon timing will need to be developed before this approach can scale into a functioning network.
Read the full story here: The Brighter Side of News – Scientific breakthrough brings quantum entanglement to existing telecom networks
