News

13.10.2017 - 12:00

6th OCL-TP Workshop

On 30-31th October, the 6th International Workshop between the "Optical Communication Lab" and the Department "Technological Physics" took place under framework of long-term cooperation agreement between the Israel Institute of Technology and the University of Kassel.

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28.02.2016 - 16:54

Q.com article in the „Physik in unserer Zeit“

A recent open-access article by research partners from the BMBF Q.com Research Network project entitled "Sichere Kommunikation per Quantenrepeater" is published in "Physik in unserer Zeit", which reports on the current state and the main challenges in this field.

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12.12.2015 - 12:00

3rd OCL-TP Workshop

On 10-11th December, the 3rd International Workshop between the "Optical Communication Lab" and the Department "Technological Physics" took place under framework of long-term cooperation agreement between the Israel Institute of Technology and the University of Kassel.

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Project QPhoton

High-Q Semiconductor Nanostructures for Single Photon Emission, Detection and Manipulation

The goal of the project is to:

    * Establish a semiconductor technology platform, which enables reliable single photon experiments;
    * Realize single photon devices and to test their potential for system applications.

The major application areas within the frame of the project are:

    * Quantum key distribution (QKD);
    * Quantum metrology (QM);
    * Optical data processing (ODP).

Key devices for these applications in the framework of the project are:

    * Single photon source (SPS);
    * Single photon detector (SPD);
    * Optical buffers based on electromagnetic induced transparency (EIT).

The devices will be developed for operation in the wavelength range of 1 - 1.3 µm.
Approaches for realization of the devices:

    * Single devices for QKD and QM approach;
    * Integrated multi-functional devices on the single photon level for ODP applications.

Complementary roads for:

    * Exploration of the interaction of single particles (photons and electrons) in semiconductor nanostructures;
    * Realization of semiconductor based single photon devices.

These roads are based on the same fabrication technologies and use self-assembled quantum dots embedded in a microcavity. Each of them has specific advantages for different applications:

    * High-Q microcavity pillars with emission perpendicular to the substrate plane (Advantages: e.g., vertical access for excitation and photon emission, high direct fibre coupling efficiency, robust technology for single devices)
    * High-Q microcavities realised in photonic-crystal membranes with in-plane emission (Advantages: e.g., potential for large scale integration and ultimate miniaturization, more favourable for the realisation of optical buffers by EIT due to the possibility to use waveguides with a very low group velocity)

The consortium combines leading European research laboratories from universities, public research institutes and the industry with complementary expertise in nanostructure technology, optoelectronic devices and quantum physics:
Project Partners:

    * (coordinator) Universität Kassel, Institute of Nanostructure Technologies & Analytics, Germany
    * Universität Würzburg, Technische Physik, Germany
    * Thales Research & Technology, France
    * Alcatel-Thales III/V Lab, France
    * Commissariat à d'Energie Atomique, France
    * Research Center DTU, Technical University of Denmark, Denmark
    * Kungl. Tekniska Högskolan, Department of Microelectronics and Information Technology (IMIT), Sweden
    * Technion, Israel Institute of Technology, Israel

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