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Spin–orbit microlaser emitting in a four-dimensional Hilbert space
Nature ( IF 64.8 ) Pub Date : 2022-11-16 , DOI: 10.1038/s41586-022-05339-z
Zhifeng Zhang 1, 2 , Haoqi Zhao 2 , Shuang Wu 1 , Tianwei Wu 1 , Xingdu Qiao 2 , Zihe Gao 1 , Ritesh Agarwal 1 , Stefano Longhi 3, 4 , Natalia M Litchinitser 5 , Li Ge 6, 7 , Liang Feng 1, 2
Affiliation  

A step towards the next generation of high-capacity, noise-resilient communication and computing technologies is a substantial increase in the dimensionality of information space and the synthesis of superposition states on an N-dimensional (N > 2) Hilbert space featuring exotic group symmetries. Despite the rapid development of photonic devices and systems, on-chip information technologies are mostly limited to two-level systems owing to the lack of sufficient reconfigurability to satisfy the stringent requirement for 2(N − 1) degrees of freedom, intrinsically associated with the increase of synthetic dimensionalities. Even with extensive efforts dedicated to recently emerged vector lasers and microcavities for the expansion of dimensionalities1,2,3,4,5,6,7,8,9,10, it still remains a challenge to actively tune the diversified, high-dimensional superposition states of light on demand. Here we demonstrate a hyperdimensional, spin–orbit microlaser for chip-scale flexible generation and manipulation of arbitrary four-level states. Two microcavities coupled through a non-Hermitian synthetic gauge field are designed to emit spin–orbit-coupled states of light with six degrees of freedom. The vectorial state of the emitted laser beam in free space can be mapped on a Bloch hypersphere defining an SU(4) symmetry, demonstrating dynamical generation and reconfiguration of high-dimensional superposition states with high fidelity.



中文翻译:

在四维希尔伯特空间中发射的自旋轨道微型激光器

迈向下一代高容量、抗噪声通信和计算技术的一步是信息空间维数的大幅增加和 N 维 ( N > 2) 具有奇异群对称性的希尔伯特空间上叠加 合成. 尽管光子器件和系统发展迅速,但由于缺乏足够的可重构性来满足对 2( N − 1) 自由度的严格要求,片上信息技术大多局限于两级系统,这 与合成维度的增加。即使为最近出现的矢量激光器和微腔做出大量努力以扩展维度1,2,3,4,5,6,7,8,9,10,主动调整光的多样化、高维叠加态按需仍然是一个挑战。在这里,我们展示了一种超维、自旋轨道微型激光器,用于芯片级灵活生成和操纵任意四级状态。通过非厄米合成规范场耦合的两个微腔设计用于发射具有六个自由度的自旋轨道耦合状态的光。自由空间中发射激光束的矢量状态可以映射到定义 SU(4) 对称性的 Bloch 超球面上,展示高保真度高维叠加态的动态生成和重构。

更新日期:2022-11-16
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