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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


Bachelor / Master Theses on Multiplexed Single Photon Sources

Context of this work


The IQO group is working within a research project (funded by the Deutsche Forschungs­gemeinschaft DFG) on the development of integrated optical, efficient true single photon source in the telecom regime. A time multiplexing scheme will be used to provide photons “on demand” with a high probability of triggered single photon generation and strongly suppressed multi-photon contributions.

The ultimate goal is to develop a time multiplexed source which is based on integrated optical circuits realized in LiNbO3. A first circuit is used for photon pair generation via parametric down-conversion (PDC) in a periodically poled section of the substrate. A monolithically integrated subsequent directional coupler acts as a wavelength division multiplexer to spatially separate the generated signal and idler photons. The device will be pumped by a burst of pump pulses. The signal photons are used to herald the presence of pair generation processes.  With a fiber-based time-multiplexing detector a herald detection with photon-number resolution will be implemented. The idler photons are routed to a second integrated circuit with two electro-optic 2x2 switches. The first idler photon within the burst - which is heralded by detecting the corresponding signal photon – is routed via the first electro-optic switch to a fiber loop. The stored photon is released from that loop at the end of the burst cycle.

Topics for master/bachelor theses:

The realization of this complex source requires the development of specific integrated optical components and circuits and their implementation. Several sub-tasks can be defined which are well suited for master or bachelor theses. In particular the following topics are feasible:

  • Optimization of fiber-waveguide interfacing
  • Electro-optically controllable switch circuits and fiber-loops
  • Design and performance studies of multiplexed single photon sources

Details of the contents are still a subject of discussion. If you are interested, feel free to contact us.


Please get in touch with

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

Dr. Harald Herrmann
Phone: 05251 60 5879
Mail: h.herrmann[at]

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