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Mapping the positions of single electron spins is a highly desired capabilityfor applications such as nanoscale magnetic resonance imaging and quantumnetwork characterization. Here, we demonstrate a method based on rotating anexternal magnetic field to identify the precise location of single electronspins in the vicinity of a quantum spin sensor. We use a nitrogen-vacancycenter in diamond as a quantum sensor and modulate the dipolar coupling to aproximate electron spin in the crystal by varying the magnetic field vector.The modulation of the dipolar coupling contains information on the coordinatesof the spin, from which we extract its position with an uncertainty of0.9\,\AA. We show that the method can be used to locate electron spins withnanometer precision up to 10\,nm away from the sensor. We discuss the method'sapplicability to mapping hyperfine coupled electron spins, and show it may beapplied to locating nitroxide radicals. The magnetic tomography method can beutilized for distance measurements for studying the structure of individualmolecules.

Mapping single electron spins with magnetic tomography