Abstract
Rare-earth-ion-doped crystals have been a promising candidate material for optical quantum memory, which is the fundamental building block for quantum networks. The unwanted broadening caused by rare-earth dopants can impose limits to the available absorption in the doped crystals. To solve this problem, stoichiometric rare-earth crystals have been considered, such as EuCl⋅36H2O crystal, whose inhomogeneous broadening is measured to be 25 MHz with an extremely strong absorption. Stoichiometric rare-earth crystals that contain Kramers ions could further fulfill the requirements for broadband quantum storage and interfacing with microwave photons. Here we grow NdCl⋅36H2O single crystals and perform optical absorption and emission spectroscopy of this material.
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