Nefedkin Nikita, Cotrufo Michele, Alù Andrea
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA.
Physics Program, Graduate Center, City University of New York, New York, NY 10016, USA.
Nanophotonics. 2023 Jan 9;12(3):589-606. doi: 10.1515/nanoph-2022-0596. eCollection 2023 Feb.
Nonreciprocity originating from classical interactions among nonlinear scatterers has been attracting increasing attention in the quantum community, offering a promising tool to control excitation transfer for quantum information processing and quantum computing. In this work, we explore the possibility of realizing largely nonreciprocal total cross sections for a pair of quantum metasurfaces formed by two parallel periodic arrays of two-level atoms. We show that large nonreciprocal responses can be obtained in such nonlinear systems by controlling the position of the atoms and their transition frequencies, without requiring that the environment in which the atoms are placed is nonreciprocal. We demonstrate the connection of this effect with the asymmetric population of a slowly decaying dark state, which is critical to obtain large nonreciprocal responses.
非线性散射体之间经典相互作用产生的非互易性在量子领域正日益受到关注，为量子信息处理和量子计算中的激发转移控制提供了一种很有前景的工具。在这项工作中，我们探索了为由两能级原子的两个平行周期阵列构成的一对量子超表面实现大幅非互易总截面的可能性。我们表明，通过控制原子的位置及其跃迁频率，在这种非线性系统中可以获得大的非互易响应，而无需原子所处的环境是非互易的。我们证明了这种效应与缓慢衰减暗态的不对称布居之间的联系，这对于获得大的非互易响应至关重要。
