Cisco unveiled the Cisco Universal Quantum Switch, a working research prototype designed to connect quantum systems from different vendors at room temperature over standard telecom fiber. The switch addresses a fundamental barrier in quantum networking by routing quantum information while preserving it across all major encoding modalities.
Quantum computers encode information in different ways, and until now, no switch could accept and translate between all major encoding modalities without destroying the quantum information. The Cisco Universal Quantum Switch uses a patented conversion engine that translates between encoding modalities at input and output, enabling connection of quantum systems that were never designed to communicate with each other.
How the Cisco Universal Quantum Switch Works
The switch is designed to support all major quantum encoding modalities used to carry information. These include polarization, which refers to the orientation of light waves; time-bin, the timing of light pulses; frequency-bin, the color or frequency of light; and path, the physical or spatial path of light. To date, the switch has been experimentally validated with polarization encoding, while support for time-bin and frequency-bin is built into the design.
The conversion engine at the heart of the switch enables the output modality to match the input or be an entirely different one. This capability allows the switch to connect and translate between quantum systems from different vendors and technologies, a critical requirement for building scalable quantum networks. When two quantum computers need to share information, the switch accepts the signal in whatever modality it arrives, translates it into a common language for routing, and delivers it in the format the receiving system needs.
Experimental Results and Performance Metrics
Cisco researchers tested the Universal Quantum Switch using the company’s own entanglement source and single-photon detectors. The experiments demonstrated that quantum information can be routed and converted across systems quickly, accurately, and efficiently without destroying it in the process.
Key findings from testing include quantum information preservation through conversion with an average of less than or equal to 4% degradation in quantum state fidelity and entanglement. The switch achieved nanosecond electro-optic switching, reconfiguring connections in as little as 1 nanosecond, and operates with energy efficiency, consuming less than 1 watt of power. These metrics demonstrate the switch maintains the coherence that quantum networks require to function properly.
Quantum Networking as the Missing Link
Today’s quantum computers are powerful but limited, operating at hundreds of qubits when real-world applications in healthcare, financial services, and aerospace will need millions of qubits to achieve the speeds and breakthroughs required. Cisco states that networking and connectivity are central to bridging that gap. The company believes that connecting quantum systems is the key to achieving true scalability in quantum computing.
Vijoy Pandey, SVP and General Manager of Outshift, Cisco’s Emerging Technologies and Incubation Group, stated: “Reaching this milestone is a moment for our quantum program and a proof point of the potential of quantum networking. 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.”
Cisco compares the role of the quantum switch to classical networking. Just as billions of people and tens of billions of devices could not be connected with direct cables, and the internet became possible because classical switches could connect endpoints through a shared, scalable network, the Cisco Universal Quantum Switch does the same for quantum systems. The quantum future will not be built by any one company or technology but by connecting them all.
Looking Ahead in Quantum Networking
The Cisco Universal Quantum Switch represents the latest milestone in Cisco’s full-stack quantum networking program, built on years of foundational research, real-world demonstrations, and a growing ecosystem of strategic collaborations. The company believes the road to practical quantum computing will be built via a distributed network of interconnected quantum devices in a matter of years, not decades.
While the switch has been experimentally validated with polarization encoding, validation support for time-bin and frequency-bin encoding represents the next step in Cisco’s ongoing development process. This advancement positions quantum networking as an emerging area of infrastructure development alongside established telecommunications and security solutions.
