NQontrol

NQontrol provides digital feedback control for quantum-optical experiments, implementing up to eight simultaneous feedback loops at 200 kHz with per-channel filtering to stabilize optical resonators and laser frequencies using techniques such as Pound-Drever-Hall (PDH) locking.

Key Features:

• ADwin platform: Implemented on the ADwin platform for real-time digital control.
• Eight simultaneous feedback loops: Supports eight independent feedback loops operating concurrently.
• 200 kHz sampling frequency: Each feedback loop can sample and update at 200 kHz.
• Five second-order filtering sections per channel: Provides five second-order filters per channel for shaping feedback transfer functions.
• Pound-Drever-Hall (PDH) locking implementation: Includes a PDH lock implementation applicable to optical resonators.
• Python support package: Supplies a Python package with programmatic access and control routines for the platform.

Scientific Applications:

• Laser frequency stabilization: Stabilizes laser frequency to optical resonators and high-finesse optical cavities using PDH locking.
• Quantum-optical experiments: Provides rapid-response digital feedback for dynamic quantum-optical and precision measurement setups.
• Benchmarking versus analog control: Demonstrated comparison against a traditional analog reference implementation for feedback-control performance.

Methodology:

Real-time digital feedback-control implemented on the ADwin platform with eight concurrent loops sampled at 200 kHz, five second-order filters per channel, and an implemented Pound-Drever-Hall (PDH) locking routine; a Python package provides programmatic control.