Using modified variant of Kelvin Probe Force Microscopy to detect single spins' photovoltage simplifies quantum sensor/ qubit design

https://www.helmholtz-berlin.de/pubbin/news_seite?nid=29886&sprache=en&seitenid=74699

"complex to read out individual/ local defect spin states optically, overcome by detecting using photo voltage... defects in nitrogen vacancy centers of diamonds can be introduced whose spin states can be manipulated with microwaves, information from single spin read out using light... tiny and compact diamond-based devices, since all that is needed are suitable contacts instead of complex microscopic optics and single-photon detectors... also applicable to other solid-state physics systems"