For the first time, a single switch can translate between all major quantum encoding types without destroying the information — a foundational step toward a quantum internet.
Cisco has unveiled a working prototype of what it calls the Universal Quantum Switch — a device designed to route quantum information between systems built by different vendors, using different encoding methods, without destroying the data in the process.
The announcement addresses one of the most stubborn obstacles in quantum networking: the inability of quantum computers to communicate with systems that encode information in different ways. Until now, no switch has been able to accept and translate between all major encoding modalities while preserving the underlying quantum state. Cisco says its prototype does exactly that, operating at room temperature over standard telecommunications fiber.
In proof-of-concept experiments, the switch preserved quantum information with less than 4% degradation in encoding and entanglement fidelity. It reconfigures connections in as little as one nanosecond and consumes less than one milliwatt of power. Full findings are expected to be published in an upcoming paper on ArXiv.
At the heart of the device is a Cisco-patented conversion engine that translates quantum signals between input and output encoding types. The switch is designed to support four major encoding modalities — polarization, time-bin, frequency-bin and path — though experimental validation to date has focused on polarization encoding, with time-bin and frequency-bin support described as the next step.
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“Reaching this milestone is a pivotal moment for our quantum program,” said Vijoy Pandey, senior vice president and general manager of Outshift, Cisco’s emerging technologies group. “We’ve long recognized that connecting quantum systems is the key to achieving true scalability, and now we’ve taken a critical step toward making that vision a reality.”
The practical significance lies in what the switch makes possible. Today’s quantum computers are powerful but isolated, typically capable of communicating only with systems that use the same encoding architecture. Cisco draws an analogy to the early internet: direct connections between every endpoint would have been unmanageable, but classical switches enabled a shared, scalable network. The Universal Quantum Switch, the company argues, performs the same function for quantum — accepting a signal in whatever format it arrives, translating it into a common routing language, and delivering it in the format the receiving system requires.
Unlike much quantum hardware, the switch requires no cryogenic cooling and operates on the same fiber infrastructure that carries conventional internet traffic, a design choice Cisco says significantly reduces deployment complexity and cost.
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The switch is one component of a broader quantum networking portfolio Cisco is assembling at its dedicated quantum labs in Santa Monica. The company has also developed a quantum network entanglement chip, which generates the entangled photons that quantum networks rely on to transmit information, and an industry-first network-aware quantum compiler, which orchestrates how algorithms are distributed and executed across multiple quantum processors. Strategic collaborations with IBM, Qunnect and Atom Computing are also underway.
Cisco said the road to practical quantum computing will be built through a distributed network of interconnected quantum devices, and that it expects the transition to unfold over years, not decades.
