Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Quanteninformation: Atome und Ionen 1
Q 41.5: Vortrag
Donnerstag, 15. März 2012, 11:45–12:00, V7.02
Single-Photon Absorption in a Single Ion Signaled by a Raman-Scattered Photon — •Christoph Kurz1, Jan Huwer1,2, Michael Schug1, Philipp Müller1, José Brito1, Joyee Ghosh1,2, and Jürgen Eschner1,2 — 1Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany — 2Institut de Ciencies Fotoniques, Castelldefels (Barcelona), Spain
In the context of quantum networking with single atoms and single photons, we pursue the photon-to-atom quantum state transfer by controlled absorption of single photons in a single ion. In the present work we explore heralding the absorption by detecting a single Raman-scattered photon. We prepare a single cooled and trapped 40Ca+ ion in the long-lived D5/2 state. Illuminating it with light at 854 nm wavelength excites it to the short-lived P3/2 level from where it decays (with 94% probability) to the S1/2 ground state, releasing a single photon at 393 nm which we detect with sub-ns time resolution. Exploiting the quantum correlation between the initial state, the polarizations of the absorbed and emitted photons, and the final state, this method may serve as a single-photon memory. We will discuss the prospects of this application, when our resonant single-photon source at 854 nm is used [1].
[1] N. Piro et al., Nature Physics 7, 17 (2011)