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Python Red Pitaya Lockbox (PyRPL): An open source software package for digital feedback control in quantum optics

Leonhard Neuhaus¹, Michaël Croquette¹, Rémi Metzdorff¹

¹Laboratoire Kastler Brossel, Collège de France, CNRS, Sorbonne Université, ENS-Université PSL, 4 Place Jussieu, F-75005 Paris, France.

The Review of Scientific Instruments

|March 7, 2024

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We introduce the Python Red Pitaya Lockbox (PyRPL), an open-source software for digital feedback controllers in quantum optics. PyRPL enhances experimental control and performance with advanced features on affordable hardware.

Area of Science:

Quantum Optics
Experimental Physics
Control Systems Engineering

Background:

Implementing precise feedback control in quantum optics experiments is crucial for achieving stable and reproducible results.
Traditional analog controllers often lack the flexibility and complexity required for advanced experimental setups.
Commercially available Field-Programmable Gate Array (FPGA) hardware offers potential for sophisticated digital control but requires specialized software solutions.

Purpose of the Study:

To develop an open-source software package, Python Red Pitaya Lockbox (PyRPL), for implementing automatic digital feedback controllers.
To enable the use of affordable FPGA boards for complex control tasks in quantum optics.
To provide integrated diagnostic tools and advanced control algorithms for enhanced experimental performance.

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Main Methods:

Development of PyRPL software enabling digital error signal generation from analog inputs.
Implementation of complex loop filters, real-time gain adjustment, and multiple analog outputs.
Integration of resonance search, lock acquisition sequences, and in-loop gain optimization algorithms.
Inclusion of diagnostic instruments: oscilloscope, network analyzer, and spectrum analyzer.

Main Results:

PyRPL facilitates the creation of scalable, automatic digital feedback controllers on FPGA hardware.
Achieved superior lock performance compared to standard analog controllers, even with imperfect equipment.
Demonstrated reduced complexity and cost for advanced feedback loop implementation.
Enabled user customization of functionalities and FPGA modifications.

Conclusions:

PyRPL offers a powerful, flexible, and cost-effective solution for digital feedback control in quantum optics.
The open-source nature fosters community development and widespread adoption.
PyRPL significantly advances the capabilities of researchers using affordable hardware for complex experiments.