Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.45: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Towards an on-demand single photon source based on room temperature vapor cells — •Michael Zugenmaier, Jürgen Appel, Jörg Müller, and Eugene Polzik — Niels Bohr Institute, Copenhagen, Denmark

The DLCZ protocol for long distance quantum communication is based on the storage of single collective excitations, superposition quantum states where one of many indistinguishable atoms is excited.

We report on the progress of our experiment applying room temperature vapor cells to create and store a single collective excitation. A weak laser pulse excites one of the Cesium atoms inside the vapor, The single excitation will be heralded by the detection of a single forward-scattered photon. The paraffin-coated cell walls preserve coherence times over milliseconds. The readout of the single excitation deterministically creates a single photon with high efficiency.

Scaleability and fast reinitialization allow to combine such cells to create a quantum information network, opening the door for DLCZ-based entanglement and other interesting experiments.