Work

A high-SNR resonant balanced photodetector with LC notch filter for the pulsed light

Year: 2025

Type: article

Abstract: The pulsed squeezed state plays a pivotal role in quantum information processing and precision measurement. In the detection of the pulsed squeezed state, the high noise power at its repetition rate prevents the achievement of a high signal-to-noise ratio (SNR). Therefore, a high-SNR detector that can suppress the high noise power of the repetition rate of pulsed light is very crucial. In this paper, we present a high-SNR resonant balanced photodetector that filters out the noise power of the repetition rate by introducing an LC series notch filter. A 24.37 dB attenuation is obtained at the 80 MHz repetition rate by finely adjusting the capacitance of the LC series notch filter. Consequently, the photodetector's maximum SNR is improved to 19.60 dB, which is 5 dB higher than previous studies. Our work provides a key detection tool for the measurement of the pulsed squeezed state.

Source: Review of Scientific Instruments

DOI: 10.1063/5.0284345

Authors: Rong Ma, Wen Zhang, Fengjuan Guo, Jun Liu, Meihong Wang, Xiaolong Su

Institutions: Shanxi University, State Key Laboratory of Quantum Optics and Quantum Optics Devices

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Funders: National Natural Science Foundation of China, Natural Science Foundation of Shanxi Province, Fund for Shanxi Key Subjects Construction, National Key Scientific Instrument and Equipment Development Projects of China

Awards: G4088935857, G4247995803, G5717813666, G9000010012