title: Magnetic resonance detection of individual proton spins using quantum reporters.
abstract: We demonstrate a method of magnetic resonance imaging with single nuclear-spin sensitivity under ambient conditions. Our method employs isolated electronic-spin quantum bits (qubits) as magnetic resonance "reporters" on the surface of high purity diamond. These spin qubits are localized with nanometer-scale uncertainty, and their quantum state is coherently manipulated and measured optically via a proximal nitrogen-vacancy color center located a few nanometers below the diamond surface. This system is then used for sensing, coherent coupling, and imaging of individual proton spins on the diamond surface with angstrom resolution. Our approach may enable direct structural imaging of complex molecules that cannot be accessed from bulk studies. It realizes a new platform for probing novel materials, monitoring chemical reactions, and manipulation of complex systems on surfaces at a quantum level.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: A O
authors.initials: AO
authors.lastname: Sushkov
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: I
authors.initials: I
authors.lastname: Lovchinsky
authors.affiliation: School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: N
authors.initials: N
authors.lastname: Chisholm
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA and Center for Brain Science, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Walsworth
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA and Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, Massachusetts 02142, USA.
authors.forename: H
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Lukin
mesh_terms: D018130:Diamond / Q000737:chemistry; D008279:Magnetic Resonance Imaging / Q000379:methods*; D011522:Protons; D045663:Quantum Dots / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D011522:Protons; D018130:Diamond