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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">科学家研发出超光速脉冲 </h1> <p class="xg1"> 时间：2012-5-8 17:02<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1878)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=2815&idtype=aid" title="查看全部评论"><em id="_commentnum">1</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>美国国家标准和技术研究所的研究人员研发出一种全新方法，可以产生超光速脉冲。相关研究成果发表在国际权威学术期刊《物理评论快报》（PRL）上。</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"><P>美国国家标准和技术研究所的研究人员研发出一种全新方法，可以产生超光速脉冲。相关研究成果发表在国际权威<a href="http://theory.oecr.com" target="_blank" class="relatedlink">学术</a>期刊《<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>评论快报》（PRL）上。<BR> <BR>这种称作“四波混频”（four-wave mixing）的方法，有望被用于缩短信号通讯时间和研究量子关联传播。<BR> <BR>根据爱因斯坦狭义相对论，光在真空中的传播速度是宇宙速度极限。但是此<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>有一个小漏洞：短脉冲光是和钟声一样以对称曲线形式传播的；波曲线的前端速度不会超过光速，但是波峰可以向前或向后倾斜，因此会导致稍早于或晚于波本身到达的时间。<BR> <BR>保罗·列特（Paul D. Lett）及其同事在研究中，通过四波混频方法，向加热小室发送200纳秒长的种子<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>脉冲。该小室充斥原子铷蒸汽；铷蒸汽放大了种子激光脉冲，将其波峰前移，使其变得“超光速”。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201205/08/170139x8hx8te5ttk1z5h8.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201205/08/170139x8hx8te5ttk1z5h8.jpg"></A></P> <P> 与此同时，种子激光脉冲发出的光束与铷蒸汽互作产生第二束脉冲——共轭脉冲；第二束脉冲的波峰也可以比光速稍快或稍慢。<BR> <BR>在此实验中，脉冲波峰比真空中光速快了50纳秒。<BR> <BR>研究人员称该研究最直接的应用是<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>量子失谐。通过测量脉冲之间的量子失谐，研究人员希望确定超光速脉冲在传播和处理量子信息中的作用。</P> <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=3443459442807635" 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" 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