Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.32: Poster
Wednesday, March 7, 2018, 16:15–18:15, Redoutensaal
Quantum interference with frequency-locked dissimilar light sources — •Chris Müller1, Tim Kroh1, Yanting Teng2, Andreas Ahlrichs1, and Oliver Benson1 — 1Humboldt-Universität zu Berlin — 2University of Illinois at Urbana-Champaign
To realize a quantum network, it will be necessary to process, store and send photons over long distances. It is unlikely that a single physical system can perform all these operations, therefore, dissimilar quantum systems have to be utilized. The first step towards a quantum network is to show that quantum information can be exchanged between its dissimilar subunits, for instance, via Hong-Ou-Mandel(HOM)-type coincidence measurements [1] on photons emitted by the subunits.
We demonstrate HOM interference between photons from two dissimilar quantum light sources. One is a cavity enhanced spontaneous parametric down-conversion source [2] and the other is a semiconductor quantum dot [3]. In order to establish photon indistinguishability, we frequency-lock both sources to the cesium D1 line (894.3 nm). Active frequency-locking is mandatory to allow for data accumulation over a sufficiently long time and for expanding the quantum network by additional units. We discuss limits of indistinguishability and how it can be improved by additional filtering of the emitted photons in the time domain.
[1] Hong et al., Phys. Rev. Lett. 59, 2044 (1987)
[2] Ahlrichs and Benson, Appl. Phys. Lett. 108, 021111 (2008)
[3] Rastelli et al., Physica Status Solidi B, 249, 687 (2012)