title: Charge and spin state readout of a double quantum dot coupled to a resonator.
abstract: State readout is a key requirement for a quantum computer. For semiconductor-based qubit devices it is usually accomplished using a separate mesoscopic electrometer. Here we demonstrate a simple detection scheme in which a radio frequency resonant circuit coupled to a semiconductor double quantum dot is used to probe its charge and spin states. These results demonstrate a new noninvasive technique for measuring charge and spin states in quantum dot systems without requiring a separate mesoscopic detector.
authors.affiliation: Cavendish Laboratory, JJ Thomson Road, Cambridge CB3 0HE, United Kingdom. kpeterss@princeton.edu
authors.forename: K D
authors.initials: KD
authors.lastname: Petersson
authors.forename: C G
authors.initials: CG
authors.lastname: Smith
authors.forename: D
authors.initials: D
authors.lastname: Anderson
authors.forename: P
authors.initials: P
authors.lastname: Atkinson
authors.forename: G A C
authors.initials: GA
authors.lastname: Jones
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie