Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Quanteninformation (Photonen und nichtklassisches Licht II)

Q 61.1: Talk

Friday, March 14, 2008, 14:00–14:15, 1A

Spectral decomposition of quantum light — •Wolfgang Mauerer and Christine Silberhorn — University Erlangen-Nuremberg, Max-Planck Research Group IOIP, Integrated Quantum Optics Group

A growing number of applications for quantum mechanics in both computation and communication has been devised during the last years. The experimental realisation is usually performed with optical technologies. Most concepts are well understood theoretically, but they are usually based on a single-mode description. This is not the case in reality, especially when fast pulsed sources are employed. Contributions from many spectral modes are unavoidable in such regimes and need to be accounted for by the models.

Following initial work presented in Ref. [1], we develop various techniques for the analysis of multi-mode states. Special emphasis is put on how to find simple and effective multi-mode descriptions for a number of recent experiments. We demonstrate that noise which has previously been accounted to experimental imperfections can emerge from spectral effects.

We also show how to derive the Bogoliubov transformations for quadratic nonlinear interactions (e.g., parametric downconversion) from a fully quantum mechanical spatio-spectral model. This is used as a basis for further structural analysis of multi-mode quantum states with various techniques, for instance Bloch-Messiah decomposition.

[1] P. P. Rohde, W. Mauerer, and Ch. Silberhorn, New Journal of Physics 9, 91(2007)