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Foto (Matthias Groppe): Holographie-Apparatur von Herrn Dr. Andreas Redler

Foto: Foto (Matthias Groppe): Holographie-Apparatur von Herrn Dr. Andreas Redler

| Evan Meyer-Scott

Master Thesis on a Novel Entangled Photon Source

We are looking for a student to do a master thesis on the construction of a new source of entangled photons.

Context of this work
Entangled photons pairs produced by parametric down-conversion are the most successful and widely employed form of entanglement for quantum communication and quantum information processing. In the context of our research in Quantum Walks and our recently awarded ERC grant QuPoPCoRN, we seek to build up a source of entangled photon pairs suitable for integration with time-multiplexed quantum walks. Our group already has strong expertise in photon source engineering and quantum walks, and now we seek to combine the best of these in a new experiment.

Photon pair sources have many parameters to consider, for example, production efficiency, coupling efficiency, entanglement quality, photon purity, repetition rate. The goal here is to develop a source that approaches the optimum for each of these, using an integrated waveguide for pair production in a free-space setup for coupling to optical fibre. In addition, a particular material (KTP) for the waveguide will be used, which allows the photons to be produced entangled in polarization, but un-entangled in frequency, an important prerequisite for interference in our quantum walks. 

Work will be together with a postdoctoral fellow, providing ample opportunity for mentorship, while allowing independent work on the optical setup.

The thesis will contain:

  • Construction of the entanglement source as sketched in the figure, including characterizing suitable waveguides from our in-house cleanroom.
  • Optimization of the relevant source parameters, including coupling efficiency and entanglement visibility. 
  • Possible operation of an electrooptic modulator to control laser pulses.
  • Characterization of the spectral properties of the produced photons using our frequency-to-time single-photon spectrometer.
  • Excellent opportunities to interact with a broad array of scientists via integration in our international group, including possible publication and conference presentation of your work.


Please get in touch with

Dr. Evan Meyer-Scott
Phone: 05251 60 5882
Mail: evan.meyer.scott[at]

Prof. Dr. Christine Silberhorn
Phone: 05251 60 5884
Mail: christine.silberhorn[at]upb.d

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