New Journal of Physics
New Journal of Physics
5 years ago

Optical coherence of 166 Er: 7 LiYF 4 crystal below 1 K

Optical coherence of 166 Er: 7 LiYF 4 crystal below 1 K
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 < 0.3T. Crystals were grown in our lab and demonstrate narrow inhomogeneous optical broadening down to 16 MHz. Solid-state atomic ensembles with such narrow linewidths are very attractive for implementing of off-resonant Raman quantum memory and for the interfacing of superconducting quantum circuits and telecom C-band optical photons. Both applications require a low magnetic field of ∼10 mT. However, at conventional experimental temperatures T > 1.5 K, optical coherence of Er:LYF crystal attains ##IMG## [http://ej.iop.org/images/1367-2630/20/2/023044/njpaaa7e4ieqn1.gif] {$\simeq 10\,\mu {\rm{s}}$} 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 coherenc...

Publisher URL: http://iopscience.iop.org/1367-2630/20/2/023044

DOI: 10.1088/1367-2630/aaa7e4

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