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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
机构：浙江工业大å¦ï¼Œæœºæ¢°å·¥ç¨‹å¦é™¢ï¼Œä¸å›½æ州，310023
目的：针对现有多ä¿çœŸå»ºæ¨¡æ–¹æ³•éœ€è¦åµŒå¥—è®ç»ƒæ ·æœ¬æ¥æ•æ‰æ•°æ®ç›¸å…³æ€§å¯¼è‡´çš„计算æˆæœ¬å¢žåŠ 与未充分考虑ä¸åŒä¿çœŸåº¦æ ·æœ¬ä¹‹é—´éžçº¿æ€§å…³ç³»å¯¼è‡´æ¨¡åž‹ç²¾åº¦ä½Žçš„问题，本文æ出一ç§ç»“åˆå¤šä¿çœŸå»ºæ¨¡å’Œä¸»åŠ¨å¦ä¹ çš„å¯é 性分æžæ–¹æ³•ï¼Œæ—¨åœ¨å®žçŽ°é«˜æ•ˆä¸”准确的失效概率估计。
创新点：1.基于éžçº¿æ€§è‡ªå›žå½’方案构建了一ç§éžçº¿æ€§è‡ªå›žå½’多ä¿çœŸå…‹é‡Œé‡‘（NAMK）模型；2.在模型更新过程ä¸ï¼Œç”¨é›†æˆçš„多ä¿çœŸå¦ä¹ å‡½æ•°ä»£æ›¿ä¼ ç»Ÿçš„å¦ä¹ 函数，通过综åˆè€ƒè™‘é‡‡æ ·æˆæœ¬å’Œå¤šä¿çœŸæ ·æœ¬ä¹‹é—´çš„相关性，从多ä¿çœŸæ ·æœ¬ç©ºé—´ä¸é€‰æ‹©æ–°çš„é‡‡æ ·ç‚¹ï¼›3.当选择高ä¿çœŸæ ·æœ¬æ—¶ï¼Œä½¿ç”¨æ®‹å·®æ¨¡åž‹ç”ŸæˆåµŒå¥—的低ä¿çœŸæ ·æœ¬ã€‚
方法：1.在指定的å‚数范围内选择åˆå§‹å¤šä¿çœŸæ ·æœ¬ï¼Œå¹¶ä½¿ç”¨NAMK构建åˆå§‹ä»£ç†æ¨¡åž‹ï¼›2.通过集æˆå¦ä¹ å‡½æ•°ç¡®å®šæ–°æ ·æœ¬çš„ä½ç½®å’Œä¿çœŸåº¦ï¼›3.一旦选择了一个高ä¿çœŸæ ·æœ¬ï¼Œæ ¹æ®æ®‹å·®æ¨¡åž‹ç”ŸæˆåµŒå¥—的低ä¿çœŸåº¦æ ·æœ¬å¹¶æ ¹æ®æ–°çš„æ ·æœ¬æ›´æ–°æ¨¡åž‹ï¼›4.使用基于相对误差估计的åœæ¢å‡†åˆ™ç»ˆæ¢ä¸»åŠ¨å¦ä¹ 过程并输出失效概率估计结果。
结论：1.本文所æ出的基于多ä¿çœŸå»ºæ¨¡å’Œä¸»åŠ¨å¦ä¹ çš„å¯é 分æžæ–¹æ³•æ高了失效概率估计的效率和精度；2.利用NAMK模型æ¥æ•æ‰å¤šä¿çœŸæ ·æœ¬ä¹‹é—´çš„éžçº¿æ€§å…³ç³»ï¼Œæœ‰æ•ˆæ高了代ç†æ¨¡åž‹çš„准确性；3.考虑多ä¿çœŸæ ·æœ¬çš„ç›¸å…³æ€§å’Œé‡‡æ ·æˆæœ¬çš„å¦ä¹ å‡½æ•°èƒ½è‡ªé€‚åº”åœ°ç¡®å®šæ–°æ ·æœ¬çš„ä½ç½®å’Œä¿çœŸåº¦ï¼›4.当å¦ä¹ 函数选择高ä¿çœŸæ ·æœ¬æ—¶ï¼Œé€šè¿‡æž„é€ æ®‹å·®æ¨¡åž‹ç”ŸæˆåµŒå¥—的低ä¿çœŸåº¦æ ·æœ¬å¯å‡å°‘低ä¿çœŸåº¦æ¨¡åž‹çš„调用次数。
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DOI:
10.1631/FITEE.2300340
CLC number:
TN29
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On-line Access:
2024-08-27
Received:
2023-10-17
Revision Accepted:
2024-05-08
Crosschecked:
2023-10-08