title: Preparing and preserving the double quantum coherence in NV-centers in Diamond at low fields.
abstract: We present and demonstrate a simple idea to excite and preserve the double-quantum-coherence (DQC) in the ground state of the electron spin of the Nitrogen-vacancy (NV) color center in diamond. We measure the coherence time of the DQC and compare it to the single quantum coherence time, both, in a Ramsey fringe experiment and under a Hahn echo sequence. We also demonstrate a robust pulse sequence based on the DANTE pulse sequence for selectively isolating the signal from the electron transitions conditional on the state of the always-present Nitrogen spin.
authors.affiliation: Institute for Quantum Computing, Waterloo, ON N2L 3G1, Canada; Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada. Electronic address: omoussa@iqc.ca.
authors.forename: Osama
authors.initials: O
authors.lastname: Moussa
authors.affiliation: Institute for Quantum Computing, Waterloo, ON N2L 3G1, Canada; Department of Applied Math., University of Waterloo, Waterloo, ON N2L 3G1, Canada.
authors.forename: Ian
authors.initials: I
authors.lastname: Hincks
authors.affiliation: Institute for Quantum Computing, Waterloo, ON N2L 3G1, Canada; Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Perimeter Institute for Theoretical Physics, Waterloo, ON N2J 2W9, Canada; Canada Institute for Advanced Research, Toronto, ON, Canada.
authors.forename: David G
authors.initials: DG
authors.lastname: Cory
keywords: BlochSiegert effect; Diamond; Double quantum; ESR; NV; Nitrogen vacancy; ODMR; Optical detection; Optical pumping; Single spin; Spin-1