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Laser & Optoelectronics Progress

多通道PPLN波导温度控制方法

衣坤朋 Yi Kunpeng, 姚权 Yao Quan, 蔺际超 Lin Jichao, 樊景丽 Fan Jingli, 魏代营 Wei Daiying, 高洋 Gao Yang, 郑名扬 Zheng Mingyang

Published Jan 1, 2023• 0 citations
Publisher

Abstract

转换效率是周期性极化铌酸锂（PPLN）波导的主要性能指标，其与温度具有很强的关联性。受限于工艺问题，波导各个通道之间的一致性很难保证。提出一种多通道波导的温度自动控制方法，该方法通过FPGA芯片获取与多通道波导对应的多个单光子探测器探测到的光子数，并通过相应均衡算法来处理各个通道的光子数，从而确定多通道波导的最佳温度工作点，达到自动调节波导温度的目的。通过FPGA实现半导体制冷片（TEC）驱动控制、具有主动淬灭和快速恢复功能的单光子探测器，并通过均衡算法实现多通道波导温度的自动控制，实现探测效率更均匀的多通道上转换单光子阵列探测器，极大地减少前期人力投入，避免人为因素导致的误差。

DOI
10.3788/lop231469

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转换效率是周期性极化铌酸锂（PPLN）波导的主要性能指标，其与温度具有很强的关联性。受限于工艺问题，波导各个通道之间的一致性很难保证。提出一种多通道波导的温度自动控制方法，该方法通过FPGA芯片获取与多通道波导对应的多个单光子探测器探测到的光子数，并通过相应均衡算法来处理各个通道的光子数，从而确定多通道波导的最佳温度工作点，达到自动调节波导温度的目的。通过FPGA实现半导体制冷片（TEC）驱动控制、具有主动淬灭和快速恢复功能的单光子探测器，并通过均衡算法实现多通道波导温度的自动控制，实现探测效率更均匀的多通道上转换单光子阵列探测器，极大地减少前期人力投入，避免人为因素导致的误差。
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Non-binary low-density parity-check (NB-LDPC) codes show larger coding gain and lower error floor than their binary counterparts in many cases. However, the existing soft decoding algorithms of NB-LDPC codes generally suffer from high computational complexity. Recently, the trellis-based extended min-sum (T-EMS) decoding algorithm has attracted much attention since it can achieve good decoding performance with high parallelism and low computational complexity. In this paper, we propose two new methods to further reduce the computational complexity and enhance the decoding performance. Firstly, we introduce, with theoretical justification, a universal scheme called threshold-based shrinking (TS) scheme, which facilitates significant reduction of computational complexity for decoding of NB-LDPC codes. Secondly, we present a modified two-extra-column (TEC) scheme and apply it to the T-EMS. Furthermore, a high-performance low-complexity decoding algorithm, named TEC-TEMS algorithm, is obtained. Combining the TS scheme with the TEC-TEMS, the new algorithm, named TS-TEC-TEMS algorithm, achieves much lower computational complexity and has negligible performance loss compared to the TEC-TEMS. For a 256-ary (256, 203) example code, compared to the T-EMS, the computational complexities of the TEC-TEMS and TS-TEC-TEMS algorithms are reduced by more than 50% and nearly 90%, respectively. Moreover, the TEC-TEMS and TS-TEC-TEMS both outperform the T-EMS by about 0.3dB when the frame error rate (FER) is around 10-5.
在实用化的高速量子随机数产生器的应用中，使用Toeplitz矩阵作为后处理方法提取量子随机数随机性已成为一种主要的技术路线。然而，Toeplitz矩阵更适合于硬件计算而不适合软件运算，通常需要搭建专门的现场可编程门阵列（FPGA）电路才能进行快速运算。基于自发辐射放大（ASE）的量子随机产生器，提出一种基于简单哈希函数的快速后处理方式。这种方式的时间复杂度仅为O（N），小于Toeplitz矩阵的O（NlogN），并且相对另一种常用的后处理方法，最低有效位（LSBs）后处理，具有更高的随机数提取效率。实验中由所提后处理方法计算得到的随机数已通过美国国家标准与技术研究所（NIST）随机性检测。
This paper investigates the thermal management and magnetic interference issues associated with the integration of thermoelectric cooling (TEC) systems into diamond quantum current sensors for power grid applications. With the increasing demand for advanced monitoring and control systems in modern power grids, quantum current sensors based on nitrogen-vacancy (NV) centers in diamonds offer significant potential due to their wide measurement range, high sensitivity, and excellent environmental adaptability. However, integrating these sensors into a compact System in Package (SiP) design introduces thermal challenges, particularly in managing the heat generated by the laser diode (LD). The TEC-based active cooling system, although compact and precise, generates magnetic interference that may impact sensor performance. Through finite element analysis (FEA) and experimental validation, the study reveals that the TEC causes significant magnetic interference, especially within 5 mm of its surface. A solution is proposed, positioning the TEC at a sufficient distance from the sensor to reduce magnetic interference to below 1 μT. Further analysis suggests that while reducing interference to sub-nanotesla levels requires a larger distance, this may reduce cooling efficiency and device integration. The findings provide valuable insights into the design of quantum current sensors with TECs, offering a balance between minimizing magnetic interference and maintaining system efficiency.
Quantum Topological Error Correction (Q-TEC) represents a paradigm shift in quantum information security, offering a promising avenue for enhancing the robustness of quantum systems against errors. Traditional quantum error correction relies heavily on classical encoding schemes, which are susceptible to noise and vulnerability to manipulation. This paper investigates the potential of utilizing quantum topological error correction (Q-TEC) to achieve significantly improved quantum information protection. We introduce a novel Q-TEC protocol based on the inherent topological properties of quantum states, leveraging these properties to create a more resilient and efficient error correction mechanism. This research focuses on the fundamental principles, implementation considerations, and potential advantages of Q-TEC over existing approaches. We present a detailed analysis of the proposed protocol and its implications for the future of quantum secure communication.