Representing Quantum Information with Digital Coding Metasurfaces,Advanced Science

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Representing Quantum Information with Digital Coding Metasurfaces
Advanced Science ( IF 14.3 ) Pub Date : 2020-09-06 , DOI: 10.1002/advs.202001648
Guo Dong Bai _{1,

2} , Tie Jun Cui _{1,

2}

Affiliation

With the development of science and technology, the way to represent information becomes more powerful and diversified. Recent research on digital coding metasurfaces has built an alternative bridge between wave‐behaviors and information science. Different from the logic information in traditional circuits, the digital bit in coding metasurfaces is based on wave‐structure interaction, which is capable of exploiting multiple degrees of freedom (DoFs). However, to what extent the digital coding metasurface can expand the information representation has not been discussed. In this work, it is shown that classical metasurfaces have the ability to mimic qubit and quantum information. An approach for simulating a two‐level spin system with meta‐atoms is proposed, from which the superposition for two optical spin states is constructed. It is further proposed that using geometric‐phase elements with nonseparable coding states can induce the classical entanglement between polarization and spatial modes, and give the condition to achieve the maximal entanglement. This study expands the information representing range of coding metasurfaces and provides an ultrathin platform to mimic quantum information.

中文翻译：

用数字编码超表面表示量子信息

随着科学技术的发展，信息的表达方式变得更加强大和多样化。最近对数字编码超表面的研究在波行为和信息科学之间架起了一座替代桥梁。与传统电路中的逻辑信息不同，编码超表面中的数字位基于波结构相互作用，能够利用多个自由度（DoF）。然而，数字编码超表面能够在多大程度上扩展信息表示尚未得到讨论。在这项工作中，表明经典超表面具有模拟量子位和量子信息的能力。提出了一种模拟元原子二能级自旋系统的方法，从中构造了两个光学自旋态的叠加。进一步提出，使用具有不可分离编码态的几何相位元可以诱发偏振模式和空间模式之间的经典纠缠，并给出实现最大纠缠的条件。这项研究扩展了编码超表面的信息表示范围，并提供了一个超薄平台来模拟量子信息。

更新日期：2020-10-22

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