Characterisation of storage efficiency in magnetic field for extending coherence time of Pr:YSO quantum memory

Abstract

Abstract Quantum memory (QM) is vital in enabling the storage and retrieval of photonic quantum states. Quantum repeaters that circumvent transmission losses over long distances can be realised by loading QMs inside. In this study, we implement spin-wave (SW) storage to extend storage time using Pr-based atomic frequency comb (AFC) QM. Furthermore, the generation of an AFC under a static magnetic field was investigated. The AFC QM was prepared with 2.5 μ s of the storage time and the SW storage of 50 μ s was demonstrated with and without a magnetic field. This study provides a basis for improving Pr-based AFC systems.