固体中光脉冲横向信息相干操控的研究

发布时间：2017-12-31 00:00

本文关键词：固体中光脉冲横向信息相干操控的研究　出处：《吉林大学》2016年博士论文　论文类型：学位论文

【摘要】：随着人类的文明迈入21世纪,传统的信息技术已经不能够满足人们日益增长的需要。伴随着量子效应的出现,人们逐渐意识到量子信息领域的发展将左右着人类文明的进步。而量子信息领域的发展始终离不开量子操控技术的进步,同时对量子存储认识的加深也促进了量子信息领域的完善。量子信息网络的构建是人类进入量子信息时代的前提,而如何实现光子的有效操控和存储则是构建量子信息网络的基础。由于固体介质自身的诸多优良特性,使得其更有利于进行光操控和光存储实验,同时固体介质也比气体介质更适合构建量子信息网络。综合各方面的因素,我们最终选择在固体介质中开展了关于光操控与光存储方面的研究工作。本文的主要研究内容为:1.在低温状态下的Pr:YSO晶体中实现了基于慢光四波混频效应的光学图像信息直接转移与全光学操控。在这一部分我们利用一个三缝光栏将光学图像信息编入探测场光脉冲之中,并通过调制探测场与控制场的光脉冲参数,使它们在低温状态下的Pr:YSO晶体中发生电磁感应光透明效应。在电磁感应光透明效应的影响下,携带有光学图像信息的探测场光脉冲在晶体中被减慢,同时我们通过CCD传感器获得了减慢之后的探测场光脉冲所携带的光学图像信息。当探测场光脉冲处于慢光状态时,我们给晶体中的电磁感应光透明系统额外添加了一个控制场光脉冲,同时通过改变这一控制场光脉冲的脉冲参数,使处于慢光状态的探测场光脉冲在晶体中经历四波混频效应并生成了一个全新的信息通道。我们对这一全新信息通道中的光脉冲信息进行采集,并与原信息通道中的光脉冲信息进行对比,发现两个信息通道中的光学图像信息基本一致。该实验结果表明在Pr:YSO晶体中慢光图像信息可以不经历存储等操作而直接在信息通道之间发生转移。之后我们通过改变额外加入的控制场光脉冲的强度,发现随着外加控制场光脉冲强度的增加,新信息通道中的图像强度也同步增加并且原信息通道中的图像强度同步减少,这表明可以通过改变外加控制场光脉冲的强度来对慢光图像在信息通道间的绝热转移进行全光学的操控。最后我们还分析了两个信息通道中图像之间的相似度,证明了慢光图像信息在绝热转移和全光学操控的过程中可以始终保持着较高的相似性。2.验证了双光脉冲的横向空间相干性在固体介质慢光存储过程中可以被保持下来,并且存储时间不会改变横向空间相干性的保持情况。在这一部分我们通过改变控制场光脉冲和两束探测场光脉冲的脉冲参数,首先在低温状态下的Pr:YSO晶体中实现了两束探测场光脉冲的慢光效应,并使这两束探测场光脉冲在射出晶体之后于CCD传感器上发生干涉。通过其干涉图样和干涉图样强度分布曲线我们得知经历慢光效应的双光脉冲干涉模式与杨氏干涉模式基本相同。之后我们使控制场光脉冲绝热的关断并于一小段时间后再次开启,从而实现了两束探测场光脉冲在低温晶体中的存储与释放。通过改变控制场光脉冲的关断时间,我们获得了不同存储时间下两个释放脉冲之间的干涉图样,通过对干涉图样进行数据处理与分析,我们进一步获得了干涉图样在水平方向上的强度分布曲线以及干涉可见度(The Interference Visibility)。从存储前后以及不同存储时间下双光脉冲的干涉图样、强度分布曲线以及干涉可见度对比中,我们发现它们之间始终具有高度的一致性,这说明存储过程不会改变两个光脉冲之间的空间干涉模式。据此我们论证了在Pr:YSO晶体中,基于电磁感应光透明的慢光存储过程能够保持双光脉冲的横向空间相干性,同时存储时间不会改变双光脉冲横向空间相干性的保持情况。最后在整个存储效应的持续时间内,我们研究了两个释放脉冲干涉图样的干涉可见度随存储时间的变化情况,发现干涉可见度几乎不随存储时间而变化并且始终保持在一个较高的数值上。这表明在整个存储时间内两个释放脉冲之间始终具有良好的干涉状态,干涉图样具有较高的辨识度,亦证明在整个存储过程中双光脉冲的横向空间相干性几乎没有发生改变。本文主要有两个创新点,其中一个是将光学图像编入探测场光脉冲之中并借助慢光四波混频效应实现了慢光图像信息在不经存储等操作下的直接转换与全光学操控。另外一个则是利用两束探测场光脉冲在低温晶体中的存储与释放,验证了双光脉冲的横向空间相干性在固体介质慢光存储过程中可以被保持下来。此外,本文在第一章中对量子信息及其相关领域的发展史做了整体的回顾,并在第二章中对实验所涉及的基本理论进行了具体的阐述,同时还对相关的主要仪器进行了详细的介绍。本文在最后一章中对全文的内容进行了回顾与总结并对下一步的研究计划以及该研究领域的前景进行了展望。
[Abstract]:With the development of human civilization in the early twenty-first Century, the traditional information technology has not been able to meet the growing needs of people. Along with the emergence of quantum effects, people gradually realize that the development of the field of quantum information will affect the progress of human civilization. And the development of the field of quantum information always cannot do without quantum manipulation technology, at the same time quantum storage also promotes the deepening understanding of the field of quantum information. Quantum information network construction is the premise of human into the quantum information era, effective control and storage and how to realize the photon is the foundation of quantum information network. Because of many excellent characteristics of solid medium itself, making it more conducive to the control of light and light at the same time, storage experiment, solid medium than gas medium is more suitable for the construction of quantum information network. Considering various factors, we select in solid medium In the research work has been carried out on optical manipulation and optical storage. The main contents of this paper are as follows: 1. under low temperature Pr:YSO crystal is realized in the direct transfer of control and full optical image information of slow light based on four wave mixing. In this part, we use a three slit light bar the optical image information into the detection field of optical pulse, and through modulation detection field and control field pulse parameters, making them happen electromagnetic induction Pr:YSO crystal at low temperature in the light transparent effect. In the influence of electromagnetically induced transparency effect, carrying the probe field optical image information of the optical pulse is slowed in the crystal in the field of optical pulse detection with optical image information at the same time we obtained by CCD sensor. When the pulse is slow slow light light field state detection, we give the electromagnetic induction in the crystal Light transparent system adds a control pulse, and by changing the parameters of pulse field light pulses that control the probe field in the state of slow light pulse through four wave mixing effect in the crystal and generate a new information channel. We on this new information channel. Optical pulse information collection and information, compared with the original information in the channel of optical pulse, found the optical image information two information channels are basically the same. The experimental results show that in Pr:YSO crystal slow light image information can not experience storage operation directly in the information channel between the transfer. After we change to control the intensity of optical pulses added, with additional control field to increase the intensity of light pulses, the intensity of the image of new information in the channel also increased simultaneously and the original image information in the channel This indicates that you can reduce the degree of synchronization, by changing the external control field of optical pulse intensity on the slow light in the image information transfer between adiabatic channel of optical manipulation. Finally we analyze the similarity between the images of the two information channel, proved slow light image information can be always maintained a high similarity to.2. show the transverse spatial coherence of double light pulses in the solid medium slow light storage process can be maintained in the process of adiabatic transfer and full optical manipulation, and storage time will never change the situation to maintain lateral spatial coherence. In this part, we can change the control field pulse and two probe pulse parameters of optical pulse the first Pr:YSO crystal at low temperature in the realization of the two detection slow light effect field of optical pulses, and the two probe optical pulse in the crystal after injection of C The occurrence of interference on the CD sensor. Through the interference pattern and the interference pattern intensity distribution curve that we experience slow light effect of double light pulse interference pattern and the young's interference model is basically the same. After we make the control pulse adiabatic shutdown and in a short time after opening, so as to realize the two probe optical pulse storage and release in the low temperature in the crystal. By changing the control pulse off time, the interference patterns we obtained under different storage time between the release of the two pulse, the interference pattern for data processing and analysis, we further obtain the intensity distribution curve of the interference pattern in the horizontal direction and the interference visibility (The Interference Visibility). The interference pattern of double light pulses before and after storage and different storage time, intensity distribution curve and the interference visibility in contrast, We have always found a high degree of consistency between them, indicating that the stored procedure does not change the space between the two optical pulse interference model. We demonstrated in Pr:YSO crystal, the slow light storage process of electromagnetically induced transparency can keep the double pulse based on transverse spatial coherence, while storage time will never change the double light pulse transverse space maintaining coherence. Finally, throughout the duration of the storage effect, the changes we studied two release pulse interference pattern interference visibility with the storage time, found almost no interference visibility with storage time changes and remain at a higher value. This indicates that always has interference good condition between the two release pulse in the whole storage period, the interference pattern with a high accuracy is shown throughout the storage process The transverse spatial coherence of double light pulses is almost not changed. This paper has two main innovations, one of which is the optical image into the probe field optical pulse and realizing the slow light image without direct conversion and storage and other operations under the full optical manipulation. By four wave mixing in slow light one is a probe optical pulse storage and release in the low temperature in the crystal by using two beams, verified the transverse spatial coherence of double light pulses in solid medium slow light storage process can be maintained. In addition, in the first chapter, the development history of quantum information and related fields to do the overall review the basic theory and in the second chapter of the experiment involved in detail, and has carried on the detailed introduction to the main instrument. In this paper, the content of the text in the last chapter reviews The future of the research project and the future of the research field are summarized and summarized.

【学位授予单位】：吉林大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：O437

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