Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Quantum Computing II

Q 55.5: Talk

Friday, March 10, 2017, 15:30–15:45, P 2

Towards all optical quantum computing with single molecules — •Mohammad Rezai, Jörg Wrachtrup, and Ilja Gerhardt — Universität Stuttgart 3. Physikalisches Institut

Single quanta of light known as photons are the key element for quantum communication of the future. One source, organic dye molecules, can be chemically designed to cover the full visible spectrum. They can simultaneously act as both a high flux and an extremely narrow-band single photon source [1]. Their spectral line-width in the range of 10-20MHz is lifetime limited, and their indistinguishability is high. For quantum hybridization experiments with atomic vapors, we use dibenzanthanthrene C30H16 which matches spectrally well with sodium D-line transitions around 589nm. This allows for spectral Faraday filtering against unwanted light, e.g. caused by the source of excitation [2]. This contributes to the single photon's indistinguishability, which is measured to be close to unity. Furthermore, we use this to realize a delayed-choice quantum eraser experiment based on photons resonant with sodium.

[1] - P. Siyushev et al., Nature, 2014, 509, 66-70 [2] - W. Kiefer et al., Scientific Reports, 2014, 4, 6552