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Scientists have developed an accessible, open-source quantum magnetic field sensor utilizing specially grown diamonds with nitrogen vacancies (NV). By shining a laser on these diamonds and sweeping them with microwave energy in the presence of a magnetic field, researchers can detect changes in electron spin states and measure magnetic fields. The project, spearheaded by Quantum Village, aims to democratize access to quantum technology, offering a relatively simple build utilizing readily available components and open-source designs – akin to the “Apple II moment” for quantum sensors.