Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 66: Quantum effects: Entanglement and decoherence II
Q 66.6: Talk
Friday, March 22, 2013, 15:30–15:45, A 310
Entanglement of two trapped ions via an optical resonator — •Bernardo Casabone1, Konstantin Friebe1, Andreas Stute1, Birgit Brandstätter1, Klemens Schueppert1, Tracy Northup1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, 6020 Innsbruck, Austria
It is often proposed to use cavities at nodes of quantum networks as they provide a natural interface between matter and light. By working with just a few trapped ions, one can explore the cavity-mediated interactions between multiple particles while still enjoying the degree of control available in single-ion experiments. We present results of entanglement between two 40Ca+ ions via coupling to the same mode of a resonator. The ions are stored in a linear ion trap and coupled to two degenerate polarization modes of a high-finesse optical resonator. A single photon is generated in one of the two polarization modes from each ion using a bichromatic Raman transition. By detecting one photon in each polarization mode the two ions are projected onto an entangled state. Entanglement is detected using parity oscillations. A fidelity up to (92.7 ± 2.7) % with respect to the maximally entangled Bell state √1/2(|10⟩ + |01⟩) is reported. The results illustrate precise control of the ions’ position in the standing wave and hence of the ion-cavity coupling.