Quantum magnetometry on the microscale

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This proposal will create a microscope for magnetic fields by measuring the quantum spin of a Bose-Einstein condensate at temperatures near absolute zero. Classical measurements of spin have underpinned transforming technologies, from magnetic resonance imaging to terabyte-scale hard-disc storage. We will make a truly quantum measurement of spin which will create a magnetic field microscope one million times more sensitive than the current state-of-the-art. The magnetic field microscope will be sensitive enough to measure fields from single biological cells and from superconducting nanosurfaces, giving critical new perspectives in biomedical research and next-generation electronics.