Progress in the emerging field of engineered quantum systems requires the development of
devices that can act as quantum memories. The realization of such devices by doping solid …

Employing a sapphire whispering gallery mode resonator, we demonstrate features of the
spin-photon interaction in cavities with broken time-reflection symmetry. The broken …

Dielectric resonators are key elements in many applications in micro to millimeter wave
circuits, including ultra-narrow band filters and frequency-determining components for …

The development of a new era of quantum devices requires an understanding of how
paramagnetic dopants or impurity spins behave in crystal hosts. Here, we describe a …

Nonlinear frequency conversion is a well known and widely exploited family of effects in
optics, often arising from a Kerr nonlinearity in a crystal medium. Here, we report high …

Fe 3+ ions in sapphire exhibit an electron spin resonance which interacts strongly with high-
Q whispering gallery modes at microwave frequencies. We report the first observation of a …

It is demonstrated that detection of putative particles such as paraphotons and axions
constituting the dark sector of the universe can be reduced to detection of extremely weak …

We report the observation of a mechanism of maser generation in an ensemble of
intercoupled, inhomogeneously broadened two-level systems, enhanced by high quality …

Interaction of Whispering Gallery Modes (WGMs) with dilute spin ensembles in solids is an
interesting paradigm of Hybrid Quantum Systems potentially beneficial for Quantum Signal …

Resonance modes in single crystal sapphire (α-Al 2 O 3) exhibit extremely high electrical
and mechanical Q factors (≈ 10 9 at 4 K), which are important characteristics for …