Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.11: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Collective coupling between two ions and a cavity for an enhanced quantum interface — •Konstantin Friebe1, Bernardo Casabone1, Birgit Brandstätter1, Klemens Schüppert1, Rainer Blatt1,2, and Tracy Northup1 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25/4, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstraße 21a, 6020 Innsbruck, Austria
In this proof-of-principle experiment, we demonstrate that collective effects improve the performance of a quantum interface between atomic qubits and single photons. Two trapped ions are coupled to the mode of an optical cavity and prepared in a maximally entangled state. By changing the phase of this state, we can control its coupling to the cavity. Thus, the coupling strength of the ion--cavity system can be tuned from sub- to superradiance. The superradiant coupling is then used to enhance the transfer of quantum information from a logical qubit encoded in the two-ion state onto a single photon [1]. In the context of quantum networks, this result provides a possible way for the implementation of distributed quantum computing with several small-scale quantum computers in optical cavities.
[1] B. Casabone et al., arXiv:1408.6266 (2014)