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高保真度32维量子纠缠态首次实现 - 站长搜索
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高保真度32维量子纠缠态首次实现

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2020-09-09 07:22:06 转载来源: 光明日报

记者从中国科技大学获悉,该校郭光灿院士团队在高维量子通信研究中取得重要进展,该团队李传锋、柳必恒研究组与奥地利马库斯·胡贝教授研究组合作,首次实现了高保真度32维量子纠缠态。本成果为进一步实现各种高维量子信息过程和研究高维系统的量子物理基本问题打下重要基础

记者从中国科技大学获悉,该校郭光灿院士团队在高维量子通信研究中取得重要进展,该团队李传锋、柳必恒研究组与奥地利马库斯·胡贝教授研究组合作,首次实现高保真度32维量子纠缠态。本成果为进一步实现各种高维量子信息过程和研究高维系统的量子物理基本问题打下重要基础。

据悉,该成果8月28日发表在国际知名期刊《物理评论快报》上。文章共同第一作者为中科院量子信息重点实验室特任副研究员胡晓敏博士和博士研究生邢文博。

相比二维系统,高维量子纠缠态在信道容量上有着巨大的优势。然而要展示这一优势,必须要实现高保真度高维量子纠缠态的制备、传输与测量。此前在光学系统中人们广泛采用光子的轨道角动量、时间或频率自由度进行编码,但还没有一个系统能够同时很好地解决高维量子纠缠态的制备、传输与测量的困难。

李传锋、柳必恒等人另辟蹊径,于2016年开始采用光子的路径自由度进行编码,并取得一系列成果。研究组还与奥地利马库斯·胡贝教授研究组合作,理论上给出了一种高效的高维纠缠态的认证方法。

“对一个32维纠缠态而言,完整的量子态层析技术需要进行一百万次测量才能确定量子态的信息,而该方法只需要一千次测量即可完成。”李传锋介绍说,最终研究组在实验上实现了32维量子纠缠态,并测定其保真度为0.933。32维的高维纠缠态维度数创造了当前世界最高水平。

标签: 高保真度 32维 量子 纠缠 首次 实现


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