%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 %0 Journal Article %J Physical Review Letters %D 2006 %T Fault-tolerant Quantum Communication with Minimal Physical Requirements %A L. Childress %A J. M. Taylor %A A. S. Sorensen %A M. D. Lukin %X We describe a novel protocol for a quantum repeater which enables long distance quantum communication through realistic, lossy photonic channels. Contrary to previous proposals, our protocol incorporates active purification of arbitrary errors at each step of the protocol using only two qubits at each repeater station. Because of these minimal physical requirements, the present protocol can be realized in simple physical systems such as solid-state single photon emitters. As an example, we show how nitrogen vacancy color centers in diamond can be used to implement the protocol, using the nuclear and electronic spin to form the two qubits. %B Physical Review Letters %V 96 %8 2006/2/23 %G eng %U http://arxiv.org/abs/quant-ph/0410123v3 %N 7 %! Phys. Rev. Lett. %R 10.1103/PhysRevLett.96.070504