Electron and nuclear spins are useful resources for the emergent field of quantum technologies, but generally, the tools used to probe them are suited for ensembles of spins, while quantum technologies require tools to probe and manipulate such spins individually. Additionally, interactions between spins, which are essential for quantum computation applications, are generally static and can be disruptive to the information stored in the spins, which calls for systems where such interactions could be controlled. Systems in which individual spins can be probed and manipulated exist, but they require setups made for working with an individual spin (or up to a few spins) at a time, and are not aimed for work with thousands of spins in parallel. As for the interactions between spins, these may be controlled and mediated by cavities strongly coupled to spins that otherwise (without the cavity) would only have a weak, or no coupling at all between them; but to date, cavities that can produce such strong couplings to single electron spins do not exist.

We use well established methods of pulsed electron spin resonance (ESR), and optically-detected magnetic resonance (ODMR), together with specially developed home-made instrumentation and methods, enroute to provide the tools to achieve the abovementioned requirements. We aim to bridge the gap between the single spin regime and the other extreme of an ensemble of spins. We also develop high sensitivity microwave resonators, aimed both to reduce the number of spins required for a readable induction-detected signal, and to increase the individual spin-cavity coupling strengths.

In this talk I will present results of high resolution 1D imaging of nitrogen-vacancy centers (NVs) in diamond, and demonstration of their selective addressing and 3D imaging, en route to achieving single spin imaging capabilities in a sample containing thousands of spins. Additionally, I will present our work with high sensitivity superconducting surface resonators, aimed to both increase the induction-detection sensing sensitivity, and spin-cavity coupling strength.