Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Quanteninformation: Atome und Ionen 1
Q 41.4: Vortrag
Donnerstag, 15. März 2012, 11:30–11:45, V7.02
An ion-photon quantum interface — •Andreas Stute1, Bernardo Casabone1, Piet O. Schmidt2, Tracy E. Northup1, and Rainer Blatt1,3 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck — 2QUEST Institute for Experimental Quantum Metrology, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig — 3Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck
In a quantum network, information has to be transferred between spatially separated sites via flying qubits in a coherent fashion. As stationary qubits, ions have proved to be ideal for state initialization, coherent manipulation and state readout. A promising candidate for a flying qubit is the polarization state of a single photon. In order to realize a coherent interface between a single ion and a single photon, we couple a single calcium ion to two orthogonal polarization modes of a high-finesse optical resonator. Applying bichromatic Raman transitions between the S1/2 and D5/2 manifolds of 40Ca+, we are able both to address the qubit states of the ion and to generate single photons with a polarization that depends on the ion’s final state. In this way, we generate entanglement between ion and photon with a fidelity suitable for implementation of a quantum repeater. Furthermore, both amplitudes and phase of the entangled state are completely controlled.