Low-noise, transformer-coupled resonant photodetector for squeezed state generation

Area of Science:

• Quantum Optics
• Electronic Engineering

Background:

• Squeezed state generation stability is limited by photodetector performance, specifically shot noise and gain.
• Existing servo-control systems require improved photodetector sensitivity for precise measurements.

Purpose of the Study:

• To develop a novel photodetector circuit for enhanced squeezed state generation.
• To reduce electronic noise and increase photodetector gain for improved weak power detection.

Main Methods:

• Implemented a transformer-coupled LC resonant amplifier as a photodetector circuit.
• Optimized transformer parameters to achieve a high quality factor (Q ≈ 100) above 100 MHz.
• Characterized the photodetector's gain and input current noise performance.

Main Results:

• Achieved a photodetector gain exceeding 1.8×10^5 V/A.
• Obtained an input current noise level below 4.7 pA/√Hz.
• Demonstrated a high quality factor (Q ≈ 100) in the 100 MHz frequency range, suitable for weak power detection.

Conclusions:

• The transformer-coupled LC resonant amplifier significantly enhances photodetector performance for squeezed state generation.
• The developed photodetector offers a viable solution for low-noise, high-gain weak power detection.
• This advancement contributes to more stable and precise squeezed state generation setups.