title: RETRACTED: Single-proton spin detection by diamond magnetometry.
abstract: Extending magnetic resonance imaging to the atomic scale has been a long-standing aspiration, driven by the prospect of directly mapping atomic positions in molecules with three-dimensional spatial resolution. We report detection of individual, isolated proton spins by a nitrogen-vacancy (NV) center in a diamond chip covered by an inorganic salt. The single-proton identity was confirmed by the Zeeman effect and by a quantum coherent rotation of the weakly coupled nuclear spin. Using the hyperfine field of the NV center as an imaging gradient, we determined proton-NV distances of less than 1 nm.
authors.affiliation: Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Loretz
authors.affiliation: Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Rosskopf
authors.affiliation: Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland.
authors.forename: J M
authors.initials: JM
authors.lastname: Boss
authors.affiliation: Institute for Experimental Physics II, Department of Nuclear Solid State Physics, Universität Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Pezzagna
authors.affiliation: Institute for Experimental Physics II, Department of Nuclear Solid State Physics, Universität Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Meijer
authors.affiliation: Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland. degenc@ethz.ch.
authors.forename: C L
authors.initials: CL
authors.lastname: Degen