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背影_中国科技大学潘建伟团队量子网络研究的重要进展

????原标题:中国科技大学潘建伟团队在量子网络研究方面取得了重要进展。潘建伟和鲍晓辉利用多光子干涉成功地将三个分离的冷原子量子纠缠,为构建多节点、长距离量子网络奠定了基础。这一成果最近发表在国际权威学术期刊《自然光子学》上,被评论界誉为“多节点量子网络的里程碑”。与经典网络相对应,量子网络是指远程量子处理器的互连。根据其发展程度,可分为三个阶段:量子密钥网络、量子存储网络和量子计算网络。量子存储网络是量子密钥网络的下一个发展阶段。在每个节点上,量子状态存储在量子内存中,并且可以在适当的时间按需读出。因此,量子存储网络可以用于更高级的量子信息任务,如量子隐形传输和分布式量子计算。鉴于量子网络的重要应用价值,国际竞争十分激烈。量子密钥网已经成熟,正在进入大规模应用,如已在中国建成的京沪量子安全通信干线。在量子存储网络的发展方向上,当前的主要目标是扩展节点数量,增加节点间的距离。例如,荷兰代尔夫特理工大学打算建立一个四节点量子网络,连接像代尔夫特和阿姆斯特丹这样的城市。阿贡国家实验室、费米实验室和美国芝加哥大学也在计划类似的量子网络。构建量子存储网络的基本资源是光与原子之间的量子纠缠。纠缠的亮度和质量直接决定了量子网络的规模和规模。为了提高纠缠亮度,潘建伟和鲍晓辉的研究小组采用环形腔增强技术来增加单光子与原子系综之间的耦合,从而大大提高了纠缠制备的效率。为了提高纠缠质量,研究小组使用了高阶模腔锁定、自滤波等技术来抑制杂散背景光子。结合这两种方法,与以往的两节点实验相比,纠缠源的亮度增加了一个数量级以上,而纠缠质量保持不变。在高亮度光与原子纠缠的基础上,通过制备多对纠缠和三光子干涉,成功地实现了三原子系综量子存储器的纠缠。实验中,在两个独立的实验室中放置了三个量子存储器,它们由18米单模光纤连接。研究人员表示,通过将团队之前实施的相关存储和纠缠技术相结合,将进一步扩大节点数量,并通过使用量子频率转换技术将原子波长转换为通信波段,将大大扩大节点之间的距离。责任编辑:余鹏飞

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