title: Single-shot readout of a single nuclear spin.
abstract: Projective measurement of single electron and nuclear spins has evolved from a gedanken experiment to a problem relevant for applications in atomic-scale technologies like quantum computing. Although several approaches allow for detection of a spin of single atoms and molecules, multiple repetitions of the experiment that are usually required for achieving a detectable signal obscure the intrinsic quantum nature of the spin's behavior. We demonstrated single-shot, projective measurement of a single nuclear spin in diamond using a quantum nondemolition measurement scheme, which allows real-time observation of an individual nuclear spin's state in a room-temperature solid. Such an ideal measurement is crucial for realization of, for example, quantum error correction protocols in a quantum register.
authors.affiliation: 3rd Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, Stuttgart 70550, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Neumann
authors.forename: Johannes
authors.initials: J
authors.lastname: Beck
authors.forename: Matthias
authors.initials: M
authors.lastname: Steiner
authors.forename: Florian
authors.initials: F
authors.lastname: Rempp
authors.forename: Helmut
authors.initials: H
authors.lastname: Fedder
authors.forename: Philip R
authors.initials: PR
authors.lastname: Hemmer
authors.forename: Jörg
authors.initials: J
authors.lastname: Wrachtrup
authors.forename: Fedor
authors.initials: F
authors.lastname: Jelezko