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</span>中科院量子信息重点实验室李传锋小组利用两块1.4毫米厚的掺钕钒酸钇晶体，分别处理光的两种正交偏振态，同时把一片特殊设计的光学元件置于两块晶体之间，整个量子存储器就像一片很小的“三明治”，紧凑而稳定，扩展和 ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content">中国科大郭光灿院士领导的中科院量子信息重点实验室，在固态系统中首次实现单光子偏振态的量子存储器，刷新世界纪录。<BR> <BR>量子存储器是量子信息领域的核心器件之一，是量子隐形传态、量子密集编码等基本量子信息过程的必需元件。同时，它还可以解决远程量子<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>中的信息损耗问题，以及用于分布式量子计算、量子精密<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>等。<BR> <BR>国际上常用的量子存储器，如冷原子、玻色-爱因斯坦凝聚等，存在带宽窄和扩展性差等缺点，难以应用于实用化的量子网络。近几年兴起的基于稀土离子掺杂<a href="http://material.oecr.com" target="_blank" class="relatedlink">晶体</a>的固态量子存储器，具有寿命长、稳定性高、带宽较宽、扩展性强等优点，但由于这种晶体有双折射效应，不能用光的偏振状态来加载信息，而光的各种偏振态是量子信息最方便的载体。因此，怎样实现光子偏振态的固态量子存储器是国际<a href="http://theory.oecr.com" target="_blank" class="relatedlink">学术</a>界一大难题。<BR> <BR>中科院量子信息重点实验室李传锋小组利用两块1.4毫米厚的掺钕钒酸钇晶体，分别处理光的两种正交偏振态，同时把一片特殊设计的光学元件置于两块晶体之间，整个量子存储器就像一片很小的“三明治”，紧凑而稳定，扩展和集成都十分方便。<BR> <BR>在实验中，摈弃了传统的固态量子存储方案中使用的“共线式”光路，设计出交叉式光路，使得预处理用的泵浦光与待存储的光不再重合，降低了泵浦光带来的噪声，从而极大地提高了存储器的保真度，可达99.9%，远高于此前单光子偏振存储95%的最高保真度，审稿人称赞为“新颖地解决了在固态器件中存储偏振比特的重要问题”。<BR> <BR>李传锋介绍，该成果对进一步提高实用化量子通信网络元件的小型化和集成化具有重要意义。同时，该超高保真度量子存储可应用于容错量子计算等具有苛刻要求的研究领域。<BR> <BR>研究成果5月11日发表在美国《<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>评论快报》上，并被美国物理学会网站“物理概要”栏目作亮点报道。 <DIV><FONT color="#808080" size=2><IMG src="http://www.oecr.com/xwb/images/bgimg/icon_logo.png"> 已同步至 <a href="http://ome.ac.cn/index.php?m=show&id=3445639130139158" target="_blank">update的微博</A></FONT></DIV></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" 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