title: Multipulse double-quantum magnetometry with near-surface nitrogen-vacancy centers.
abstract: We discuss multipulse magnetometry that exploits all three magnetic sublevels of the S=1 nitrogen-vacancy center in diamond to achieve enhanced magnetic field sensitivity. Based on dual frequency microwave pulsing, the scheme is twice as sensitive to ac magnetic fields as conventional two-level magnetometry. We derive the spin evolution operator for dual frequency microwave excitation and show its effectiveness for double-quantum state swaps. Using multipulse sequences of up to 128 pulses under optimized conditions, we show enhancement of the SNR by up to a factor of 2 in detecting NMR statistical signals, with a 4× enhancement theoretically possible.
authors.affiliation: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA.
authors.forename: H J
authors.initials: HJ
authors.lastname: Mamin
authors.affiliation: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA.
authors.forename: M H
authors.initials: MH
authors.lastname: Sherwood
authors.affiliation: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA and Center for Probing the Nanoscale, Stanford University, Stanford, California 94305, USA.
authors.forename: M
authors.initials: M
authors.lastname: Kim
authors.affiliation: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA.
authors.forename: C T
authors.initials: CT
authors.lastname: Rettner
authors.affiliation: Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA.
authors.forename: K
authors.initials: K
authors.lastname: Ohno
authors.affiliation: Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA and Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: D D
authors.initials: DD
authors.lastname: Awschalom
authors.affiliation: IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120, USA.
authors.forename: D
authors.initials: D
authors.lastname: Rugar