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Q: Fachverband Quantenoptik und Photonik
Q 34: Quantum Information (Quantum Communication)
Q 34.3: Vortrag
Dienstag, 6. März 2018, 14:30–14:45, K 1.020
Quantum state teleportation from a single ion to a single photon by heralded absorption — •Jan Arenskötter, Stephan Kucera, Matthias Kreis, Pascal Eich, Philipp Müller, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, Campus E2.6, 66123 Saarbrücken
Quantum networks with trapped ions require interfaces between the nodes and channels and a resource of entanglement for long distance communication. Photon-pair sources based on spontaneous parametric down-conversion (SPDC) and tailored to match an atomic transition are such a resource [1]. Quantum state teleportation [2] provides a protocol for atom-photon interfaces, alternative to direct quantum state transfer [3].
We show the teleportation of a qubit encoded in the D5/2 Zeeman sub-levels of the 40Ca+ ion onto the polarization qubit of a single 854 nm photon. For this we use a cavity-enhanced SPDC source in Sagnac configuration, tunable and bandwidth-optimized for resonant interaction with the 40Ca+ ion. The Bell state measurement of the teleportation protocol is implemented through heralded absorption of one photon of the pair [4]. The mean process fidelity of the teleportation after background correction is 86.3(23)%, and the mean overlap fidelity of the input states with the measured output states is 89.6(55)%.
[1] Haase et al., Opt. Let. 34, 55 (2009).
[2] Bennett et al., Phys. Rev. Lett. 70, 1895 (1993)
[3] Kurz et al., Phys. Rev. A 93, 062348 (2016).
[4] Kurz et al., Nat. Commun. 5, 5527 (2014).