Optical coherence of Er$^{3+}$:Y$_2$O$_3$ ceramics for telecommunication quantum technologies

@article{Fukumori2019OpticalCO,
  title={Optical coherence of Er\$^\{3+\}\$:Y\$\_2\$O\$\_3\$ ceramics for telecommunication quantum technologies},
  author={Rikuto Fukumori and Yizhong Huang and Jun Yang and Haitao Zhang and Tian Zhong},
  journal={arXiv: Applied Physics},
  year={2019}
}
We report an optical homogeneous linewidth of 580 $\pm$ 20 Hz of Er$^{3+}$:Y$_2$O$_3$ ceramics at millikelvin temperatures, narrowest so far in rare-earth doped ceramics. We show slow spectral diffusion of $\sim$2 kHz over a millisecond time scale. Temperature, field dependence of optical coherence and spectral diffusions reveal the remaining dephasing mechanism as elastic two-level systems in polycrystalline grain boundaries and superhyperfine interactions of Er$^{3+}$ with nuclear spins. In… 
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