title: Indirect quantum sensors: improving the sensitivity in characterizing very weakly coupled spins.
abstract: We propose a scheme to increase the sensitivity and thus the detection volume of nanoscale single molecule magnetic resonance imaging. The proposal aims to surpass the T1 limited detection of the sensor by taking advantage of a long-lived ancillary nuclear spin to which the sensor is coupled. We show how this nuclear spin takes over the role of the sensor spin, keeping the characteristic time-scales of detection on the same order but with a longer life-time allowing it to detect a larger volume of the sample, which is not possible by the sensor alone.
authors.affiliation: 3. Physikalisches Institut, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. d.dasari@physik.uni-stuttgart.de.
authors.forename: Johannes N
authors.initials: JN
authors.lastname: Greiner
authors.forename: D D Bhaktavatsala
authors.initials: DD
authors.lastname: Rao
authors.forename: Philipp
authors.initials: P
authors.lastname: Neumann
authors.forename: Jörg
authors.initials: J
authors.lastname: Wrachtrup