Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 47: SYPC 3: From Atoms to Photonic Circuits 3

A 47.1: Vortrag

Freitag, 16. März 2012, 10:30–10:45, V47.02

Towards quantum dot - photon entanglement swapping — •Tim Kroh, Otto Dietz, Andreas W Schell, and Oliver Benson — AG Nano Optics, Institut für Physik, HU Berlin

The distance of fiber based quantum communication can be increased arbitrarily with the help of quantum repeaters. In realizations of quantum repeater architectures involving semiconductor quantum dots (QDs) entanglement swapping between two dissimilar entangled states, i.e. an entangled QD-photon state on one hand and a photon pair on the other hand is a crucial operation. A first experiment involving a quantum dot and a photon pair was demonstrated recently [1].

The next important step is to demonstrate two-photon interference between a single photon from a quantum dot and a photon from an entangled photon pair. To achieve indistinguishability at least one of the photon sources has to be tunable. We present first experiments in this direction where we investigate different semiconductor QDs which are tunable with respect to photon pair sources.

[1] Solomon et al., Phys. Rev. Lett. 107, 157402