Long-term quantum storage for quantum communication applications will require optically
accessible states with coherence times exceeding the desired storage time. Ground-state …

The hyperfine structure of the ground state of erbium-doped yttrium orthosilicate is analyzed
with the use of electron paramagnetic resonance experiments in a tunable microwave …

The properties of doped and natural impurities in lithium niobate single crystals are studied
using the whispering gallery mode method at low temperatures as a function of magnetic …

We performed magnetic field and frequency tunable electron paramagnetic resonance
spectroscopy of an Er 3+-doped Y 2 SiO 5 crystal by observing the change in flux induced …

This work demonstrates strong coupling regime between an erbium ion spin ensemble and
microwave hybrid cavity-whispering gallery modes in a yttrium aluminium garnet dielectric …

The Y 2 SiO 5 (YSO) crystal is a dielectric material with biaxial anisotropy with known values
of refractive index at optical frequencies. It is a well-known rare-earth (RE) host material for …

The low dielectric losses of an isotopically pure single crystal 28Si sample were determined
at a temperature of 20 mK and at powers equivalent to that of a single photon. Whispering …

The potential capabilities of resonators based on two dimensional arrays of re-entrant posts
is demonstrated. Such posts may be regarded as magnetically coupled lumped element …

Low-loss crystals with defects due to paramagnetic or rare earth impurity ions are a major
area of investigation for quantum hybrid systems at both optical and microwave frequencies …

Hybrid quantum circuits interfacing rare earth spin ensembles with microwave resonators
are a promising approach for application as coherent quantum memory and frequency …