连续变量压缩态光场控制及测量系统的研究
发布时间：2018-12-31 16:15
【摘要】：随着量子光学和量子信息科学的发展,人们发现量子噪声压缩和量子纠缠是非常重要的量子资源,可以在信息与计算领域完成经典物理不可能完成的工作,诸如利用纠缠态光场实现量子离物传态、量子密集编码、量子纠缠交换及量子计算等。近年来,量子信息科学正朝着实用化方向发展,而作为连续变量量子信息处理必备的非经典光源的压缩态光场及通过压缩态光场构建的EPR纠缠态光场,必须具备小型化、集成化、数字化、能够长时间稳定运转的特点。全固态双波长连续单频激光器,是产生连续变量压缩态光场的最重要组成部分。首先在连续变量压缩态光场产生过程中,作为泵浦源的全固态双波长单频激光器产生的相干态光场被分别用作简并光学参量放大器DOPA的抽运光和种子光,其次在压缩态光场的平衡零拍探测系统中,激光器输出的基频光(相干态)作为本地振荡光来放大待测的微弱信号光(压缩态),并生成相应的散粒噪声基准。因此全固态双波长单频激光器性能的好坏将直接影响压缩态光场压缩度的产生和测量。为了获得稳定的高功率、单频以及理想光束质量的激光输出,山西大学光电研究所相关实验小组提出了一系列针对激光器腔形设计方面的实验解决方案,而我们则将注意力更多的放在如何设计优化激光器的控制系统上,针对激光器系统要求温度控制系统不仅具有精度高而且稳定度高的特点,设计了高精度温度控制系统。同时,为了最终得到可实用化的连续变量压缩源系统,我们对温度控制系统进行了小型化、智能化、低能耗等性能的优化,从而提高整个非经典光源系统的性能。在实验中不仅需要产生稳定的高压缩度的压缩态光场,并且准确测量其压缩度同等重要。为了寻求一种能够准确测量量子噪声抑制的探测方法,许多实验小组也开展了高性能探测器方面的实验研究,而平衡零拍探测方法由于具有能够有效地降低经典噪声,放大信号光和直接表征信号光的正交分量起伏量的优点,而成为连续变量量子信息科学研究中测量压缩态量子噪声的最佳方法之一。本论文的主要研究内容及取得的成果如下：1、完成了小型化的连续变量压缩源控制系统的研制,并将其应用到波长为1.06μm的压缩源整机系统中,该整套样机已提供给中国空间技术研究院508所用于量子空间遥感技术的研究,并获得较高评价。该控制系统实现了小型化、智能化的激光器控制系统、一体化的锁定控制系统和高性能的平衡零拍探测系统。2、研制开发了小型化、智能化的高精度数字温度控制系统,并将其配套于全固态单频绿光激光器中,通过软件设计实现了系统的自动开关机过程,工作过程中各路温度失控时的自动报警及保护功能,现已将其作为产品在全国多处科研院所应用。高精度数字温度控制系统结合变速积分PID控制算法,利用分辨率高达14位的HRPWM技术控制双路全桥驱动器为TEC提供最大14A的电流,同时,对系统中的常温温度控制和高温温度控制部分分别采用恒流源和恒压源方式作为温度检测电路。从而提高了温度控制系统的控制精度和能力。该系统同时含有四路独立的常温控温(10-40℃)模块和一路高温(120-160℃)控温模块,系统各路的控温精度均优于±0.005℃。最终提高了全固态连续单频激光器功率及频率稳定性,从而有效改善了压缩态光场的稳定性。3、基于平衡零拍探测的理论,利用干涉效率和共模抑制比的概念,定量地分析了非理想平衡零拍探测对测量压缩度的影响,构建了测量偏差、实际压缩度、50/50分束器的分束比、干涉效率和共模抑相比的关系,这对于通过测量的压缩度来分析压缩态的实际压缩度非常重要。4、基于平衡零拍探测器的自减方案,以及对光电二极管的等效电路的分析,得到两个光电二极管的光电流对共模抑制比的影响分为两方面,即光电流的振幅差异和位相差异。由光电管的量子效率和暗电流引起的光电流的振幅差异可以通过精细的调节分束器的分数比来得以补偿。而由光电管的等效电容和串联电阻引起的光电流的位相差异通过差分微调电路和可调的偏置电压来得以补偿。最终完成了低噪声、高增益和高共模抑制比的平衡零拍探测器的设计并将其产品化,在探测器中安装任意两个ETX500,我们获得了激光功率1mW时散粒噪声谱在2MHz处高于电子学噪声20dB,探测器的饱和功率为54mW,共模抑制比为75.2dB。该探测器能很好地满足压缩态探测对低噪声、高增益、高饱和功率及高共模抑制比的要求。
[Abstract]:With the development of quantum optics and quantum information science, it is found that quantum noise compression and quantum entanglement are very important quantum resources, and can complete the work of the classical physical impossibility in the field of information and calculation, such as using the entangled state light field to realize the quantum separation state, Quantum dense coding, quantum entanglement exchange and quantum computation, etc. In recent years, the quantum information science is developing in the practical direction, and as a necessary non-classical light source in the continuous variable quantum information processing and the EPR entangled state light field constructed by the compressed state light field, the quantum information science has to be miniaturized, integrated, digitized, and can be stably operated for a long time. All-solid-state dual-wavelength continuous single-frequency laser is one of the most important components of a continuous variable compression state optical field. firstly, in a continuous variable compression state light field generation process, the coherent state light field generated as an all-solid-state dual-wavelength single-frequency laser as a pump source is used as the pumping light and the seed light of the degenerate optical parametric amplifier DOPA, respectively, The fundamental frequency light (coherent state) output by the laser is used as the local oscillation light to amplify the weak signal light (compressed state) to be measured, and a corresponding dispersion noise reference is generated. Therefore, the performance of all-solid-state dual-wavelength single-frequency laser will directly affect the generation and measurement of the compression degree of the squeezed optical field. In order to obtain stable high power, single-frequency and ideal beam quality laser output, the relevant experimental group of the Institute of photoelectric research of the University of Shanxi University has proposed a series of experimental solutions for laser cavity-shaped design. And we focus more on how to design and optimize the control system of the laser, and the high-precision temperature control system is designed for the laser system, which requires the temperature control system not only has the characteristics of high precision and high stability. At the same time, in order to get a practical continuous variable compression source system, we have carried out the optimization of the temperature control system, such as miniaturization, intellectualization, low energy consumption and so on, so as to improve the performance of the whole non-classical light source system. In the experiment, it is not only necessary to produce a steady high-compression-state optical field, but also to measure the degree of compression equally important. In order to find a detection method capable of accurately measuring the quantum noise suppression, many experimental groups have also carried out the experimental research on the high-performance detector, and the balanced zero-beat detection method has the advantages of being capable of effectively reducing the classical noise, It is one of the best ways to measure the quantum noise of compressed state in the research of quantum information of continuous variable. The main research contents and achievements of this paper are as follows: 1. The development of a miniaturized continuous variable compression source control system is completed, and it is applied to a compressed source system with a wavelength of 1.06. m The prototype has been provided to the Chinese Academy of Space Technology 508 for the research of the quantum space remote sensing technology, and has obtained a higher evaluation. the control system realizes the miniaturization, the intelligent laser control system, the integrated lock control system and the high-performance balanced zero-shooting detection system. and it is matched with all-solid-state single-frequency green light laser, and the automatic switch machine process of the system is realized through the software design, and the automatic alarm and protection function during the control of each temperature in the working process is realized, and the automatic switch machine has been applied as a product in a plurality of scientific research institutions throughout the country. The high-precision digital temperature control system combines the variable speed integral PID control algorithm to control the two-way full-bridge driver to provide the maximum 14A current to the TEC by using the HRPWM technology with high resolution up to 14 bits, and meanwhile, the normal-temperature temperature control and the high-temperature temperature control part in the system are used as the temperature detection circuit by using a constant current source and a constant voltage source respectively. so that the control precision and the capability of the temperature control system are improved. The system also contains four independent temperature control modules (10-40 鈩，
本文编号：2396822
[Abstract]:With the development of quantum optics and quantum information science, it is found that quantum noise compression and quantum entanglement are very important quantum resources, and can complete the work of the classical physical impossibility in the field of information and calculation, such as using the entangled state light field to realize the quantum separation state, Quantum dense coding, quantum entanglement exchange and quantum computation, etc. In recent years, the quantum information science is developing in the practical direction, and as a necessary non-classical light source in the continuous variable quantum information processing and the EPR entangled state light field constructed by the compressed state light field, the quantum information science has to be miniaturized, integrated, digitized, and can be stably operated for a long time. All-solid-state dual-wavelength continuous single-frequency laser is one of the most important components of a continuous variable compression state optical field. firstly, in a continuous variable compression state light field generation process, the coherent state light field generated as an all-solid-state dual-wavelength single-frequency laser as a pump source is used as the pumping light and the seed light of the degenerate optical parametric amplifier DOPA, respectively, The fundamental frequency light (coherent state) output by the laser is used as the local oscillation light to amplify the weak signal light (compressed state) to be measured, and a corresponding dispersion noise reference is generated. Therefore, the performance of all-solid-state dual-wavelength single-frequency laser will directly affect the generation and measurement of the compression degree of the squeezed optical field. In order to obtain stable high power, single-frequency and ideal beam quality laser output, the relevant experimental group of the Institute of photoelectric research of the University of Shanxi University has proposed a series of experimental solutions for laser cavity-shaped design. And we focus more on how to design and optimize the control system of the laser, and the high-precision temperature control system is designed for the laser system, which requires the temperature control system not only has the characteristics of high precision and high stability. At the same time, in order to get a practical continuous variable compression source system, we have carried out the optimization of the temperature control system, such as miniaturization, intellectualization, low energy consumption and so on, so as to improve the performance of the whole non-classical light source system. In the experiment, it is not only necessary to produce a steady high-compression-state optical field, but also to measure the degree of compression equally important. In order to find a detection method capable of accurately measuring the quantum noise suppression, many experimental groups have also carried out the experimental research on the high-performance detector, and the balanced zero-beat detection method has the advantages of being capable of effectively reducing the classical noise, It is one of the best ways to measure the quantum noise of compressed state in the research of quantum information of continuous variable. The main research contents and achievements of this paper are as follows: 1. The development of a miniaturized continuous variable compression source control system is completed, and it is applied to a compressed source system with a wavelength of 1.06. m The prototype has been provided to the Chinese Academy of Space Technology 508 for the research of the quantum space remote sensing technology, and has obtained a higher evaluation. the control system realizes the miniaturization, the intelligent laser control system, the integrated lock control system and the high-performance balanced zero-shooting detection system. and it is matched with all-solid-state single-frequency green light laser, and the automatic switch machine process of the system is realized through the software design, and the automatic alarm and protection function during the control of each temperature in the working process is realized, and the automatic switch machine has been applied as a product in a plurality of scientific research institutions throughout the country. The high-precision digital temperature control system combines the variable speed integral PID control algorithm to control the two-way full-bridge driver to provide the maximum 14A current to the TEC by using the HRPWM technology with high resolution up to 14 bits, and meanwhile, the normal-temperature temperature control and the high-temperature temperature control part in the system are used as the temperature detection circuit by using a constant current source and a constant voltage source respectively. so that the control precision and the capability of the temperature control system are improved. The system also contains four independent temperature control modules (10-40 鈩，
本文编号：2396822
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