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    Quantum internet leaves the lab with first real-world entanglement over busy telecom fiber

    July 23, 2026, Categories  Physics, Technology/Electronics

    Quantum internet leaves the lab
    Entangled photons are distributed over 24.4 km of deployed fiber from Evanston to Chicago. One of the photons is wavelength division multiplexed to propagate with a state-of-the-art classical communications system and optical synchronization clock. BW, bandwidth; EPPS, entangled photon pair source; MUX, wavelength-division multiplexer; OLS Tx (Rx), classical optical line system transmitter (receiver); SNSPD, superconducting nanowire single photon detector; TDC, time-to-digital converter; WR, White Rabbit synchronizer. Credit: Optica Quantum (2026). DOI: 10.1364/opticaq.592786

    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...

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