中国科大成功观测双光子空间波函数动力学演化—新闻

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font: 12px 宋体; float: right"> 选择字号：<span onclick="showsize(12)" style="background-color: #587c19; color: #fff; font-size: 12px; cursor: pointer">小</span> <span onclick="showsize(14)" style="background-color: #587c19; color: #fff; font-size: 12px; cursor: pointer">中</span> <span onclick="showsize(16)" style="background-color: #587c19; color: #fff; font-size: 12px; cursor: pointer"> 大</span> </div> </td> </tr> <tr> <td align="center"> <div id="content1" style=" padding:15px; text-align: left; line-height: 24px; word-wrap: break-word;word-break:break-all" class="f14"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td height="20"> </td> </tr> <tr> <td align="center" valign="middle" class="style1" style="font-size: 13px; color: #333333; font-family: 宋体; line-height: 20px"> <b></b></td> </tr> <tr> <td align="center" class="style1" style="font-size: 22px; color: #587c19; font-family: 黑体; line-height: 30px"> 中国科大成功观测双光子空间波函数动力学演化</td> </tr> <tr> <td align="center" valign="middle" class="style1" style="font-size: 13px; color: #333333; font-family: 宋体; line-height: 20px"> <b></b></td> </tr> </table> <p > </p><p style=";; margin: 0px 0px 26px; text-align: justify; word-break: break-all;">中国科学技术大学郭光灿<span class="errorText">院士</span>团队在量子测量与传感研究中取得重要进展。该团队李传锋、许金时、刘曌地等人首次提出并实验实现了量子夏克–哈特曼（Shack–Hartmann）波前传感器。通过重构双光子横向空间波函数，观测了位置纠缠光子对在自由空间传播时振幅关联和相位关联的动力学演化。7月16日，该成果发表在《物理评论快报》上。</p> <div style="text-align: center;" class="ueditorOption ueditorOptionModel" contenteditable="true" id="0"> <img src="https://rmtzx.sciencenet.cn//kxwsprint/6698e06ae4b03b5da6d1321d.png" data-wenge-id="111135" wosname="6698e06ae4b03b5da6d1321d.png" size="148893" opaid="wenge-pklxubvyils0/" _src="https://rmtzx.sciencenet.cn//kxwsprint/6698e06ae4b03b5da6d1321d.png" data-mce-src="https://rmtzx.sciencenet.cn//kxwsprint/6698e06ae4b03b5da6d1321d.png" id="img-null"> <span style="display:block;color: #999;font-size:14px;margin:0;text-align:center;line-height:20px;" class="img_caption" placeholder="请输入图说"><span style=";; text-align: justify; text-wrap: wrap;">量子波前传感原理示意图（小图）和实验装置图。中国科图</span></span> </div> <p class="timeLine_wg" style="height:20px;"><span style="display:none"><span contenteditable="false" style="height: 0px; padding: 0px; margin: 0px; display: block; z-index: 9999; color: rgb(255, 255, 255); font-size: 0px; line-height: 0px; position: absolute; border-top: 1px dashed rgb(181, 189, 202); user-select: none; left: 0px; right: 0px; top: 8px;"><span class="timeIdentification" style="width:0px;height:0px;padding:0px;margin:0px;display:block;z-index:9999;color:#fff;position:absolute;font-size: 0px;line-height:0px;border-color:transparent;display:block;border-style:solid;right:0px;border-right-color:#B5BDCA;border-width:8px 8px 8px 0;top:-8px"> </span><span style="width:0px;height:0px;padding:0px;margin:0px;display:block;z-index:9999;color:#fff;position:absolute;font-size: 0px;line-height:0px;border-color:transparent;display:block;border-style:solid;left:0px;border-left-color:#B5BDCA;border-width:8px 0 8px 8px;top:-8px"> </span><span class="hide_time_wg" title="在这插入段落" contenteditable="false" style="width:0px;height:0px;padding:0px;margin:0px;display:block;z-index:9999;color:#fff;position:absolute;font-size: 22px;line-height:17px;height:17px;text-align: center;width:17px;right:17px;background:#B5BDCA;cursor:pointer;top:-8px; border-radius: 2px;" onclick="timeLine(this)">?</span></span></span></p> <p style=";; margin: 0px 0px 26px; text-align: justify; word-break: break-all;">光场相位分布的测量是一个关键问题，特别是在自适应光学中，可用来校正像差的影响。研究团队在经典波前传感方面做了一系列的工作，包括研究了基于光子玻姆轨迹实验装置的弱测量波前传感，实现了更高的空间分辨率，以及提出并数值模拟了基于弱测量波前传感的纠缠光子波前重构等。<br></p> <p style=";; margin: 0px 0px 26px; text-align: justify; word-break: break-all;">经典光学中，夏克–哈特曼波前传感是一种广泛使用的相位测量方法，它使用微透镜阵列，将光场在局部空间的传播方向转换为聚焦光斑的位移，从而测量得到光场相位梯度的分布，并重构出相位。其空间分辨率由透镜尺寸决定。</p> <p style=";; margin: 0px 0px 26px; text-align: justify; word-break: break-all;">研究团队受此启发，提出并实现了量子夏克–哈特曼波前传感器，观测到位置纠缠光子对空间波函数的动力学演化。双光子射入透镜阵列后，在其后焦面探测双光子的联合空间概率分布。通过对单个微透镜孔径内所有点的条件概率分布求和并利用梯度算法可以重构出相位，结合强度分布即可得到双光子空间波函数。研究团队测量了自发参量下转换产生的光子对在自由空间不同演化时间的空间波函数，观测到双光子在自由空间传播过程中振幅关联逐渐变弱，而相位关联逐渐变强的过程。研究组还测量了双光子在动量空间使用空间光调制器加载双曲抛物面相位后的波函数。</p> <p style=";; margin: 0px 0px 26px; text-align: justify; word-break: break-all;">研究人员介绍，该方法作为量子自适应光学这一全新领域的关键技术，在未来可应用于量子通信、天文观测和多光子相互作用的检验中。</p> <p class="lastPadding" style=";; margin: 0px 0px 26px; text-align: justify; word-break: break-all;">相关论文信息：<a href="https://doi.org/10.1103/PhysRevLett.133.033602" _src="https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.033602" _href="https://doi.org/10.1103/PhysRevLett.133.033602">https://doi.org/10.1103/PhysRevLett.133.033602</a></p><div> </div><div style="text-indent:0em;font-weight:bold;font-size:13px;border:solid 1px #333 ;padding:10px;" class="bq">版权声明：凡本网注明“来源：中国科学报、科学网、科学新闻杂志”的所有作品，网站转载，请在正文上方注明来源和作者，且不得对内容作实质性改动；微信公众号、头条号等新媒体平台，转载请联系授权。邮箱：shouquan@stimes.cn。</div> <div style="border-bottom: solid 1px #bfc89d; vertical-align: bottom; width: 100%; height: 20px"> </div> <div style="width: 100%; height: 20px; text-align: center; margin:10px">  <script src="/html/js/share.js" type="text/javascript"></script>  </div> </div> </td> </tr> </table> </td> </tr> </table> <div style="line-height: 10px; height: 10px; clear: both;">  </div> <div style=" vertical-align: bottom; width: 100%; text-align:right"> <div style="float:left"> </div> <form action="/html/mail.aspx" method="post" id="myform" style="float:right"> <span onclick="javascript:window.print()" style="cursor: pointer; 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