%0 Journal Article %J Nature Physics %D 2008 %T High-sensitivity diamond magnetometer with nanoscale resolution %A J. M. Taylor %A P. Cappellaro %A L. Childress %A L. Jiang %A D. Budker %A P. R. Hemmer %A A. Yacoby %A R. Walsworth %A M. D. Lukin %X We present a novel approach to the detection of weak magnetic fields that takes advantage of recently developed techniques for the coherent control of solid-state electron spin quantum bits. Specifically, we investigate a magnetic sensor based on Nitrogen-Vacancy centers in room-temperature diamond. We discuss two important applications of this technique: a nanoscale magnetometer that could potentially detect precession of single nuclear spins and an optical magnetic field imager combining spatial resolution ranging from micrometers to millimeters with a sensitivity approaching few femtotesla/Hz$^{1/2}$. %B Nature Physics %V 4 %P 810 - 816 %8 2008/9/14 %G eng %U http://arxiv.org/abs/0805.1367v1 %N 10 %! Nat Phys %R 10.1038/nphys1075