Optical coherence of 166Er:7LiYF4 crystal below 1 K

Abstract

We explore optical coherence and spin dynamics of an isotopically purified ^166 Er: ^7 LiYF _4 crystal below 1 K and at weak magnetic fields 1.5 K, optical coherence of Er:LYF crystal attains $\simeq 10\,\mu {\rm{s}}$ time scale only at strong magnetic fields above 1.5 T. In the present work, we demonstrate that the deep freezing of Er:LYF crystal below 1 K results in the increase of optical coherence time to $\simeq 100\,\mu {\rm{s}}$ at weak fields.

Keywords

• Rare-earth doped crystals
• quantum information architectures & platforms
• optical coherence
• spin relaxation
• optical quantum memory
• spin coherence