Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics II

Q 42.28: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Atrium Informatik

An open-source platform for digital control-loops in quantum-optical experiments — •Christian Darsow-Fromm, Luis Dekant, Stephan Grebien, Maik Schröder, Roman Schnabel, and Sebastian Steinlechner — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Experiments in quantum optics often require a large number of control loops, e.g. for length-stabilization of optical cavities and control of phase gates. These control loops are generally implemented using one of three approaches: commercial (digital) controllers, self-built analog circuitry, or custom solutions around “maker-style” projects based on FPGAs and microcontrollers. Each of these approaches has individual drawbacks, such as high cost, lack of scalability and flexibility, or high maintenance effort. Here we present a solution based on the ADwin digital control platform that is able to deliver in excess of 8 simultaneous locking loops running with 200 kHz sampling frequency, and offers five second-order filtering sections per channel for optimal control performance. A comprehensive software package written in Python, together with a web-based GUI, makes the system as easy to use as commercial products, while giving the full flexibility of open-source platforms.