Superior atomic coherence time controlled by crystal phase transition and optical dressing
Jinyang Li, Jianfeng Zhu, Muhammad Imran, Huanrong Fan, Anas Mujahid, Faisal Nadeem, Peng Li, Yanpeng Zhang
Abstract
We compare the atomic coherence time of doped ion crystals, i.e., BiPO 4 : Eu 3+ , YPO 4 : Eu 3+ , YPO 4 : Pr 3+ , and Y 2 SiO 5 : Pr 3 + crystals. Such atomic coherence time is controlled by crystal field splitting (CF-splitting) and optical (photon and phonon) dressing. Compared with the other doped ion crystals, BiPO 4 : Eu 3+ exhibits the longest coherence time. By controlling thermal phonon, phase-transition phonon, broadband or narrowband excitation, and fluorescence (FL) or spontaneous four-wave-mixing ratio (S-FWM), a superior atomic coherence time of up to 10 ± 0.6 ms is achieved in the pure hexagonal (0.5:1) phase of BiPO 4 : Eu 3+ . Furthermore, the relationship between TAT-splitting and spectral Autler–Townes (SAT)-splitting was investigated. This superior atomic coherence time has potential applications in quantum memory devices.