Spin–orbit microlaser emitting in a four-dimensional Hilbert space
Spin–orbit microlaser emitting in a four-dimensional Hilbert space
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DOI：
10.1038/s41586-022-05339-z
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发表时间：
2022-11
期刊：
影响因子：
64.8
通讯作者：
Zhifeng Zhang;Haoqi Zhao;Shuang Wu;Tianwei Wu;Xingdu Qiao;Zihe Gao;R. Agarwal;S. Longhi;N. Litchinitser;L. Ge;Liang Feng
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文献类型：
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作者：
Zhifeng Zhang;Haoqi Zhao;Shuang Wu;Tianwei Wu;Xingdu Qiao;Zihe Gao;R. Agarwal;S. Longhi;N. Litchinitser;L. Ge;Liang Feng
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以及具有奇异群对称性的 N 维 (N> 2) 希尔伯特空间上叠加态的合成。尽管光子器件和系统快速发展，但片上信息技术大多局限于两级系统，因为缺乏足够的可重构性来满足2(N− 1)自由度的严格要求，这本质上与合成维度的增加有关。即使在最近出现的矢量激光器和微腔的维数扩展方面做出了广泛的努力，但根据需要主动调整光的多样化、高维叠加态仍然是一个挑战。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能级状态。通过非厄米合成规范场耦合的两个微腔被设计为发射具有六个自由度的自旋轨道耦合状态的光。自由空间中发射的激光束的矢量状态可以映射到定义 SU(4) 对称性的布洛赫超球面上，展示了高保真度高维叠加态的动态生成和重新配置。
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 anN-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 dimensionalities, , , , , , , , –, 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.