Cisco prototype turns quantum entanglement into an on-demand service
Cisco has developed a research prototype called Quantum Network Controller that lets applications request entangled quantum states without managing the underlying hardware. The software abstracts sources, switches, detectors, and timing equipment, then schedules delivery based on requested endpoints, rate, fidelity, and timing. In a February 2026 trial, Cisco coordinated multi-node entanglement over 17.6 km of commercial fiber in New York City and reported polarization fidelity above 99 percent at room temperature.
Cisco's prototype addresses a scaling problem: linking quantum processors point to point doesn't scale, since a thousand-node network would need roughly 500,000 dedicated connections. The company's Universal Quantum Switch, also a research prototype, aims to consolidate those into a shared fabric, with the Controller acting as the scheduling layer above it.
The Controller presents a single interface for each hardware category — sources, switches, detectors, timing — so equipment from different vendors connects uniformly. Because reading a quantum state would destroy it, the software instead tracks link quality statistically and applies retries or reinitialization automatically, escalating to a human only if self-correction fails.
If entanglement becomes a schedulable service, quantum networking could shift from lab demonstrations toward infrastructure that developers and operators treat like any other utility. Research groups and telecom carriers may benefit first, since they already run fiber and hardware. Longer term, secure communication and distributed sensing could reach more users, though the technology remains a prototype tested over a single metropolitan link, so broad societal effects are likely years away and depend on hardware maturity.