Sorces of squeezed light

Based on continuous three wave mixing via degenerate optical paramteric amplification .

In this lab we study some fundamental aspects of quantum optics. Squeezed light sources are the working horse for generating nonclassical states of light. Squeezed states of light have been studied well. Hence they can serve as a reference state for testing novel quantum state characterisation approaches.

Here, we use two optical parametric amplifers to generate squeezed states at 1064 nm. These states are used in various experiments, ranging from e.g. homodyne cross correlation measurements, generation of entangled states to click detection of squeezed states.

See List of Publications.

Homodyne correlation measurement in photonic waveguide structures

We develop a novel measurement techniques for high order odd-operator power correlation properties of light fields via balanced homodyne correlation measurements in photonic waveguide structures.

Click detection of squeezed vacuum states

In cooperation with Prof. Dr. A. A. Semenov (Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine) we aim to investigate different states (coherent and squeezed vacuum) with real click detectors.

AI-aided characterization of quantum states

This project is embeded in the IRTG 2676 Imaging Quantum Systems and addresses the experimental characterization of general quantum states with the aim to develop a novel feedback-based adaptive detection scheme. Our method will be based on the principle of homodyne cross correlation measurement (HCCM) to gather information about the investigated state. An Artificial Intellingence (AI) algorithm will then be implemented in the detection scheme to actively give feedback to the measurement. As a proof of principle experiment, this will be firstly realized with squeezed states.

Cooming soon: Underwater QKD with spatially structured squeezed light

This project is embeded in the IRTG 2676 Imaging Quantum Systems and is performed in cooperation with Prof. Dr. Ebrahim Karimi and Prof. Dr. Jeff Lundeen of the university in Ottawa, Canada.