UK Project Develops QKD Receiver Modules for Quantum Key Distribution

A groundbreaking UK project is currently underway to revolutionize quantum key distribution technology by developing two distinct receiver modules aimed at reducing the cost of secure quantum networking. The MARCONI QKD receiver project, with a budget of £1.5 million, is focused on creating high-fidelity, modular, and scalable receiver modules that utilize components from a UK-based supply chain.

The primary objective of the project is to introduce two original equipment manufacturer (OEM) QKD receivers that leverage different technologies but can seamlessly interchange at the optical connection point. By utilizing UK components in the construction of these receivers, the project ensures the establishment of a robust domestic supply chain for critical quantum networking technologies, thereby reducing dependence on foreign suppliers.

To cater to varying needs, MARCONI plans to develop high-performance OEM receiver modules suitable for both small-scale setups and large installations. This strategic approach is designed to disrupt the market and promote diversity in suppliers, moving away from reliance on single-source providers.

For applications requiring smaller setups and short-distance communications, the project will incorporate a four-channel single photon avalanche detector (SPAD) system featuring Noiseless InGaAs technology from Sheffield-based Phlux Technology. The components will be packaged by Bay Photonics in Devon, with Phlux aiming to achieve 10Gbit/s optical links in space.

On the other hand, for larger and long-distance applications, the project will utilize a superconducting nanowire single photon detector (SNSPD) system. This system will include enhanced SNSPDs from the University of Glasgow, cooled by a novel 1K system from Chase Cryogenics, and coupled with a compact timetagger from Redwave Labs in Harwell.