High quality-factor tunable resonators for quantum information storage
10 January 2019
Tunable Nb superconducting resonator based on a constriction nano-SQUID fabricated with a Ne focused ion beam.
High quality-factor tunable resonators underpin the storage and retrieval of microwave-domain quantum information into spin ensembles used as long-lived quantum memories and can enable multi-frequency high-sensitivity electron spin resonance (ESR). A team based at the London Centre for Nanotechnology has developed a single layer technology based on embedding nanoSQUIDs in superconducting niobium resonators to realise high quality frequency tunable devices which are resilient to moderate fields.