Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.57: Poster

Tuesday, March 9, 2010, 16:00–19:00, Lichthof

Characterisation of non-classical radiation generated in semiconductor systems using multi-pixel photon detectors — •Robert Löffler, Gerolf Burau, and Heinrich Stolz — Universität Rostock, Institut für Physik, Universitätsplatz 3, 18055 Rostock

The characterisation of multi-photon quantum states requires the use of photon number resolving detectors. Such devices are urgently needed for applications in quantum computation and information. But beside that, they are also suitable for a more fundamental view on nature like identifying whether a quantum state is classical or non-classical (coherent or squeezed) due to their photon statistics. Here we propose an adequate setup consisting of a multi-pixel photon counting diode and a low noise amplification circuit integrated in a modified low temperature cryostat (down to 10K). We present recent measurements on photon statistics of semiconductor lasers and LEDs and compare them with reconstructions of the photon distributions in the presence of dark counts, cross talk and loss with high precision. Our system is appropriate for measuring and reconstructing unknown quantum states e.g. excitons in quantum dots as well.