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Localized electronic spins in solid-state environments form versatile androbust platforms for quantum sensing, metrology and quantum informationprocessing. With optically detected magnetic resonance (ODMR), it is possibleto prepare and readout highly coherent spin systems, up to room temperature,with orders of magnitude enhanced sensitivities and spatial resolutionscompared to induction-based techniques, allowing for single spin manipulations.While ODMR was first observed in organic molecules, many other systems havesince then been identified. Among them is the nitrogen-vacancy (NV) center indiamond, which is used both as a nanoscale quantum sensor for external fieldsand as a spin qubit. Other systems permitting ODMR are rare earth ions used asquantum memories and many other color centers trapped in bulk or 2-dimensionalhost materials. In order to allow the broadest possible community ofresearchers and engineers to investigate and develop novel ODMR-based materialsand applications, we review here the setting up of ODMR experiments usingcommercially available hardware. We also present in detail the dedicatedcollaborative open-source interface named Qudi and describe the features weadded to speed-up data acquisition, relax instrument requirements and extendits applicability to ensemble measurements. Covering both hardware and softwaredevelopment, this article aims to steepen the learning curve of newcomers inODMR from a variety of scientific backgrounds, optimize the experimentaldevelopment time, preempt the common measurement pitfalls, and provide anefficient, portable and collaborative interface to implement innovativeexperiments.

Optically detected magnetic resonance with an open source platform