Cisco Introduces Quantum Switch Built for Existing Telecom Fiber Infrastructure

Cisco announced the Cisco Universal Quantum Switch, a research prototype aimed at addressing a key challenge in quantum networking. The development is part of the company’s broader quantum networking efforts, which build on prior research, demonstrations, and collaborations.

Quantum systems encode information in different ways, and historically, switches have not been able to translate between these encoding methods without disrupting the quantum information. The Cisco Universal Quantum Switch is designed to route and convert quantum data across multiple encoding modalities while preserving it, operating at room temperature and using existing telecommunications fiber. A patented conversion engine enables translation between formats at both input and output.

Building a Network Layer for Quantum Systems

Current quantum computers operate with hundreds of qubits, while many potential applications may require systems with millions. Cisco’s approach emphasizes networking as a way to connect multiple quantum systems to expand overall capability.

The concept is similar to classical networking: instead of direct connections between every system, a shared network allows scalable communication. The Cisco Universal Quantum Switch is intended to perform a comparable role by accepting quantum signals in different formats, converting them into a common representation for routing, and delivering them in the required output format.

The switch is designed to support several encoding types, including:

• Polarization (light orientation)
• Time-bin (pulse timing)
• Frequency-bin (light frequency)
• Path (spatial route)

So far, experimental validation has been completed using polarization encoding, with additional modalities planned for future testing.

Prototype Testing Results

In internal experiments using Cisco-developed components, the prototype demonstrated the ability to route and convert quantum information while maintaining its integrity. Reported findings include:

• Less than 4% degradation in quantum state fidelity and entanglement
• Switching speeds on the order of one nanosecond
• Power consumption below one milliwatt

Design Characteristics

Cisco describes several intended attributes of the switch:

• Compatibility with multiple encoding methods, unlike existing single-modality approaches.
• Operation at room temperature, avoiding specialized cooling requirements.
• Use of standard telecom frequencies over existing fiber infrastructure.
• Ability to connect systems from different vendors.

The switch is being developed as part of a broader architecture that includes hardware, software, and application layers for distributed quantum networking.

Source: Cisco Systems, Inc.

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