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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2024 Vol.25 No.2 P.316-322
A low-noise, high-gain, and large-dynamic-range photodetector based on a JFET and a charge amplifier
Abstract: We demonstrate a low-noise, high-gain, and large-dynamic-range photodetector (PD) based on a junction field-effect transistor (JFET) and a charge amplifier for the measurement of quantum noise in Bell-state detection (BSD). Particular photodiode junction capacitance allows the silicon N-channel JFET 2sk152 to be matched to the noise requirement for charge amplifier A250. The electronic noise of the PD is effectively suppressed and the signal-to-noise ratio (SNR) is up to 15 dB at the analysis frequency of 2.75 MHz for a coherent laser power of 50.08 μW. By combining of the inductor and capacitance, the alternating current (AC) and direct current (DC) branches of the PD can operate linearly in a dynamic range from 25.06 μW to 17.50 mW. The PD can completely meet the requirements of SNR and dynamic range for BSD in quantum optics experiments.
Key words: Quantum noise; Bell-state detection (BSD); Photodetector (PD); Junction field-effect transistor (JFET); Charge amplifier
1吕梁学院物理系，中国吕梁市，033001
2华南理工大学广东省光纤激光材料与应用技术重点实验室，中国广州市，510640
摘要：设计一种基于J型场效应管和电荷放大器的低噪声、高增益、大动态范围光电探测器，用于贝尔态探测中量子噪声的测量。特定光电二极管的结电容允许硅N沟道J型场效应管2sk152匹配电荷放大器A250的噪声要求。当相干激光功率为50.08 µW时，在2.75 MHz分析频率处，光电探测器的电子噪声得到有效抑制，信噪比高达15 dB。通过电感和电容组合，光电探测器的交流和直流支路可以在25.06 µW~17.50 mW的动态范围内线性工作。该光电探测器可以完全满足量子光学实验中贝尔态探测对信噪比和动态范围的要求。
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DOI:
10.1631/FITEE.2300340
CLC number:
TN29
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On-line Access:
2024-02-23
Received:
2023-05-13
Revision Accepted:
2024-02-23
Crosschecked:
2023-10-08