Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 69: Quantum Information: Quantum Computing and Communication IV

Q 69.5: Talk

Friday, March 4, 2016, 15:30–15:45, e214

A two-color polarization-entangled photon pair source for applications in hybrid quantum architectures — •Chris Müller, Otto Dietz, Tim Kroh, Thomas Kreißl, and Oliver Benson — AG Nanooptik, Institut für Physik, Humboldt-Universität zu Berlin

Entangled photon pairs can be exploited to realize a quantum repeater [1] which is crucial for a long distant quantum communication. However, entangled photon pairs can also be used for establishing entanglement between dissimilar systems to create quantum hybrid structures.
We set up a two-color polarization-entangled parametric down conversion source in a folded-sandwich geometry [2] to create entangled photon pairs. This setup can generate highly non-degerate photons with wavelengths at the Cs D1 line (894.3 nm) and the telecom O-band (1313.1 nm), while obtaining an entanglement fidelity of F = (75 ± 2 )% [3].
The long term goal is to establish a hybrid quantum interface where the photon pair source is used to demonstrate teleportation [1] of the electronic state of a semiconductor quantum dot [4] to photons at telecom wavelength.

[1] Bussières F., et al. Nature Photonics 8, 775-778 (2014)

[2] Steinlechner F., et al. Optics Express 21, 11943 (2013)

[3] Dietz O., et al. Applied Physics B accepted

[4] Gao W.B., et al. Nature Comm. 4, 2744 (2013)