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This breakthrough validates that quantum networks can operate on existing telecom infrastructure by multiplexing fragile entangled photons with high-capacity commercial traffic in separate optical bands. Achieving over 94% fidelity despite heavy data loads removes a major barrier to deploying scalable, real-world quantum internet without requiring dedicated fiber cabling for every link.

Source coveringThe Quantum Insider

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Northwestern University Researchers Demonstrate Quantum Entanglement Over Busy Telecom Fiber

The Quantum InsiderJuly 23, 20265 min read

Insider Brief PRESS RELEASE — Quantum information is notoriously fragile. Internet traffic is anything but. Yet Northwestern University scientists have demonstrated they can peacefully coexist inside the same fiber-optic cable. In a new study, researchers successfully sent entangled photons through a 24.4-kilometer fiber-optic cable connecting Evanston and downtown Chicago while the same cable simultaneously carried […]

Northwestern University researchers demonstrated that entangled photons can be distributed over a 24.4-kilometer metropolitan fiber-optic link while the same cable simultaneously carried high-capacity commercial internet traffic, supporting the feasibility of quantum networks on existing telecommunications infrastructure. By transmitting quantum signals in the optical O-band, separating them from conventional C-band traffic, and using precise picosecond-level synchronization, the team preserved entanglement with more than 94% fidelity despite heavy data transmission. The researchers plan to build on the demonstration by performing quantum teleportation between remote nodes across a live metropolitan telecommunications network carrying commercial…

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