Hannover 2016 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

Q: Fachverband Quantenoptik und Photonik

Q 11: Poster: Quantum Optics and Photonics I

Q 11.34: Poster

Monday, February 29, 2016, 16:30–19:00, Empore Lichthof

Quantum State Tomography of Kerr-squeezed fs-pulses in optical fibres — •Kai Barnscheidt, Oskar Schlettwein, Jakob Studer, and Boris Hage — Arbeitsgruppe Experimentelle Quantenoptik, Institut für Physik, Universität Rostock, D-18059 Rostock, Germany

Balanced homodyne detection is used for optical state tomography accessing the field quadratures of a signal field with a local oscillator. By tuning the phase between signal and a strong local oscillator information about multiple quadratures is gained and can be used for reconstructing the quantum state of the signal. fs-pulses in optical fibres are affected by linear and nonlinear effects due to high intensities and long travelling distances in fibres, influencing the pulse parameter (e.g. pulseshape, wavelength) and further the quantum state of the light. Balanced homodyne detection is based on interference of a strong local oscillator with the signal, hence a constant phase relation and matching pulse parameters are needed during the measurement time. We propose a method able to extract the local oscillator out of the Kerr-squeezed signal itself. An optical cavity is held on resonance to the repetition frequency of the laser using Pound-Drever-Hall lock-in technique. The cavity is transparent for the main part of the pulse, while the information about the quantum state, present in all sidebands, is mostly reflected by the incoupling mirror of the cavity. The reflected beam (signal) and the transient beam (local oscillator) can then be used for balanced homodyne detection to reconstruct the quantum state via tomographic methods.