Quantum Transducers

Quantum transducers are devices that convert quantum information between different physical domains, specifically between microwave photons (used by superconducting quantum chips) and optical photons (used in fiber optic cables), enabling quantum information to be transmitted over long distances. To build a quantum internet (a network of quantum computers connected via quantum communication), we need to connect superconducting chips (which use microwave photons for quantum operations) via fiber optic cables (which use optical photons for long-distance transmission), and quantum transducers bridge this gap by converting between these two types of photons while preserving quantum information. While highly experimental, efficient transduction (conversion with minimal loss of quantum information) is considered the 'holy grail' enabling distributed quantum computing across data centers, where quantum processors in different locations can work together as a single quantum computer.

This innovation addresses the challenge of connecting quantum computers over long distances, where different quantum systems use different types of photons. By enabling conversion, transducers could enable quantum networks. Research institutions are developing these technologies.

The technology is essential for enabling quantum networks and distributed quantum computing, where connecting quantum computers is necessary for many applications. As the technology improves, it could enable practical quantum networks. However, achieving high efficiency, preserving quantum information, and managing losses remain significant challenges. The technology represents an important direction for quantum networking, but requires extensive research to achieve practicality. Success could enable quantum networks and distributed quantum computing, but the technology must overcome substantial technical challenges. Quantum transducers remain largely experimental, with efficiency being a major challenge.