Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 2: Quantum Communication I
Q 2.5: Vortrag
Montag, 6. März 2017, 15:45–16:00, P 3
Photon-photon to atom-photon entanglement transfer — •Stephan Kucera, Jan Arenskötter, Pascal Eich, Matthias Kreis, Philipp Müller, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, Campus E2.6, 66123 Saarbrücken
Implementation of a quantum network with single atoms as quantum nodes and single photons as channels between the nodes requires their interfacing in receiver mode, whereby the photonic qubit is mapped onto the internal degrees of freedom of the atom [1]. Combining such a receiver interface with a source of entangled photon pairs enables the distribution of entanglement between network nodes.
We implemented the heralded state-mapping protocol of [2] to operate a single trapped 40Ca+ ion in receiver mode. Using a high-brightness narrowband source of resonant entangled photon pairs, we transferred the photon-photon polarization entanglement to atom-photon entanglement by heralded absorption of one photon of the pair. Quantum state tomography on the polarization qubit of the other photon of the pair and the atomic spin qubit after absorption demonstrates the preservation of the entanglement.
[1] Kurz et al., Phys. Rev. A 93, 062348 (2016).
[2] Kurz et al., Nat. Commun. 5, 5527 (2014).