NPL measurement technique accelerates progress towards quantum networks

NPL’s Optical Fiber Metrology team devised an innovative new approach to measure a key parameter for optical fibre performance called Mode Field Diameter (MFD) on commercial quantum-grade connectors intended for use in a quantum internet. The technique incorporates traceable verification into high performance quantum-grade interconnects, to ensure the most efficient transmission possible of entangled photons over fibre networks. 

Robert Ferguson, Higher Scientist at NPL, said, “A photonic-based quantum internet will need high quality and efficient interconnects for long-haul operation of quantum computing and secure communication processes. Its performance is dependent upon very low-loss connectivity between optical interconnecting components that make up the network hardware.”

Ferguson continued, “Maximising network efficiencies in quantum networks is essential in order to ensure the optimal transmission of entangled photons in a quantum internet. Connectors used in a quantum network must have excellent coupling efficiencies to minimise link losses. Fibre that does not meet the necessary efficiency levels will degrade transmission and impede performance.”