Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.48: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Entanglement of two trapped ions via an optical resonator — •Bernardo Casabone1, Konstantin Friebe1, Andreas Stute1, Birgit Brandstätter1, Klemens Schüppert1, Tracy Northup1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck, Austria
We demonstrate precise control of the coupling of each of two trapped ions to the mode of an optical resonator. When both ions are coupled with near-maximum strength, we generate ion-ion entanglement heralded by the detection of two orthogonally polarized cavity photons. The entanglement fidelity with respect to the Bell state |Ψ+⟩ reaches F ≤ (91.9 ± 2.5)%. We present numerical simulations of fidelity as a function of the interval between photon detection times, based on the quantum Monte Carlo method. The simulations agree with the measured data and provide insight into the coherent and incoherent effects that contribute to the reduction of the fidelity. This result represent an important step toward distributed quantum computing with cavities linking remote atom-based registers.