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<div class="ss"><div><span>导读： </span>美国国会图书馆档案室一角计算机储存科技日新月异，以前的计算机硬盘数GiB (Gibibyte千兆位)就相当了不起，到了现在已增加到TiB(Tebibyte 一兆位)。不过未来还会再更大，日前，一个来自荷兰Delft大学的科研团队在英 ...</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"><div style="text-align: center;"><p><a href="data/attachment/portal/201607/20/154328pbe7wmru7bwbuopb.jpg" target="_blank"><img src="data/attachment/portal/201607/20/154328pbe7wmru7bwbuopb.jpg"></a></p><p><span style="color: rgb(90, 90, 90); font-family: 'microsoft yahei'; font-size: 12px; line-height: 21.6px; background-color: rgb(255, 255, 255);">美国国会图书馆档案室一角</span></p></div><div>计算机储存科技日新月异，以前的计算机硬盘数GiB (Gibibyte千兆位)就相当了不起，到了现在已增加到TiB(Tebibyte 一兆位)。不过未来还会再更大，<span style="line-height: 1.8em;">日前，一个来自荷兰Delft大学的科研团队在英国科学杂志《自然<a href="http://material.oecr.com" target="_blank" class="relatedlink">纳米</a>技术》(Nature Nanotechnology)上发表了他们最新的研究成果：利用单一原子存储信息的可重复使用存储设备。</span></div><div><span style="line-height: 1.8em;"><br></span></div><div><div><a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>上该技术能够在一平方英寸（大约一个SD卡大小）中存储500TB的数据，这相当于在0.1平方毫米的面积里存下整个美国国会图书馆里的所有档案和书籍。不过，目前该团队展示的实际效果只能在0.1平方毫米里存入1KB。</div><div><br></div><div>其实<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学家们早在25年前就具备了原子控制能力。1990年，物理学家DonEigler就已经可以利用扫描隧道<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>显微镜将35个氙原子排列成“IBM"字样。但是，由于原子在常温条件下极端的不稳定性，控制原子的技术成本很高，加上适宜的存储介质（即使用哪种原子）不好确定等原因，使得科学界采用原子存储数据的想法一直未能实现。</div><div style="text-align: center;"><p><a href="data/attachment/portal/201607/20/154140ngutvtl9gzwvd6tu.jpg" target="_blank"><img src="data/attachment/portal/201607/20/154140ngutvtl9gzwvd6tu.jpg"></a></p></div><div style="text-align: center;"><span style="line-height: 1.8em;">1990年物理学家DonEigler用35个氙原子排列成“IBM"字样</span></div><div><br></div><div>这些年随着时代的进步，电子科学技术的发展，最终使原子存储成为可能。</div><div style="text-align: center;"><img src="http://www.oecr.com/data/attachment/portal/201607/20/154139qhwd41dqpub3zh0h.jpg" style="line-height: 1.8em;"></div><div><br></div><div><span style="line-height: 1.8em;">Delft大学的科研团队在一块预先排好栅格的铜板上吸附氯离子，然后通过最新的扫描隧道电子显微镜和一个特殊的“镊子”，控制氯原子在栅格中的分布，将氯原子和空隙排列成不同的组合，分别代表二进制的0或者1，从而实现了数据存储。具体的原子和空缺排列形式如下图所示：</span></div><div style="text-align: center;"><p><a href="data/attachment/portal/201607/20/154140kf8rhrifaimacfoc.jpg" target="_blank"><img src="data/attachment/portal/201607/20/154140kf8rhrifaimacfoc.jpg"></a></p></div><div><span style="line-height: 1.8em;">图中深色的表示氯原子，浅色表示空缺，每四个方块表示一个栅格，每个栅格表示一个数据位，每行栅格表示一个字节。图中的一行用二进制ASCII编码的形式表示了小写字母e。</span></div><div style="text-align: center;"><p><a href="data/attachment/portal/201607/20/154140cqtmmg021ax20mvi.jpg" target="_blank"><img src="data/attachment/portal/201607/20/154140cqtmmg021ax20mvi.jpg"></a></p></div><div><br></div><div><span style="line-height: 1.8em;">这种实现方式相对于1990年的做法有两点主要优势。</span></div><div><br></div><div>首先，因为原子周边都是空缺，因此完全可以细微地在栅格内按照原子固有的方式运动，相对于物理学家DonEigler将原子固定在一个点的做法，这提高了设备的稳定性。这种稳定性还带来了一个好处，从前需要液氦-210℃低温才能实现的原子控制现在-196℃就能满足要求。</div><div><br></div><div>另一方面，由于科学家可以在每个栅格做标记（比如在左上角放一个其他原子），这大大提高了数据的读取速度。从前需要一个接一个栅格地完整读取，然后再回头判断已经读取的数据是否正好满一个字节，现在只需要顺次读下去，碰到标记表示一个字节就行了。因此从前读取一组数据可能需要长达几天的时间，现在只要几个小时就OK了。</div><div><br></div></div><div><span style="line-height: 25.2px;">不过目前该技术只能在实验室里进行，因为这种储存方式的工作温度极低，低到摄氏零下-195度，研究团队需要用液态氮冷却。虽然液态氮很便宜，不过这与一般的室温环境仍然差距太大，也就是说离实用化至少还需要好几年。</span><span style="line-height: 25.2px;">不过，令人兴奋的一点是，该技术或许对未来的原子存储技术指明了发展方向，我们期待着今后更大的突破。（光电工程师<a href="http://club.oecr.com" target="_blank" class="relatedlink">社区</a>）</span></div><div style="text-align: center;"><p><a href="data/attachment/portal/201607/20/154458aaap1rscefeejezi.jpg" target="_blank"><img 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<span class="xg1 xw0">2016-7-20 17:18</span> </dt> <dd>妥妥的支持！</dd> </dl><a name="comment_anchor_7382"></a> <dl id="comment_7382_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(7382, '4645');">引用</a> </span> <a href="http://club.oecr.com/space-uid-79150.html" class="xi2 xw1" c="1">hsl074</a> <span class="xg1 xw0">2016-7-20 16:48</span> </dt> <dd>老用户留个脚印</dd> </dl><a name="comment_anchor_7381"></a> <dl id="comment_7381_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(7381, '4645');">引用</a> </span> <a href="http://club.oecr.com/space-uid-79648.html" class="xi2 xw1" c="1">mmmmmmnnnn</a> <span class="xg1 xw0">2016-7-20 16:17</span> </dt> <dd>真的不错的网站。</dd> </dl><a name="comment_anchor_7380"></a> <dl id="comment_7380_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" 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