Temporal distinguishability in Hong-Ou-Mandel interference for harnessing high-dimensional frequency entanglement
Temporal distinguishability in Hong-Ou-Mandel interference for harnessing high-dimensional frequency entanglement
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DOI：
10.1038/s41534-021-00504-0
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发表时间：
2021-12-07
影响因子：
7.6
通讯作者：
Ursin, Rupert
中科院分区：
文献类型：
--
作者：
Chen, Yuanyuan;Ecker, Sebastian;Ursin, Rupert
高维量子纠缠以其较高的信息容量和纠错能力，是目前量子信息处理领域中研究最多的领域之一。长期以来，一种利用高维纠缠的通用方法一直被誉为探索量子科学和技术的绝对必要条件。本文利用Hong-Ou-Mandel干涉来控制任意维希尔伯特空间中的离散频率纠缠。从理论上和实验上研究了二维、四维和六维频率纠缠量子的产生和表征，从而可以估计整个状态空间的纠缠维数。此外，我们的策略可以推广到其他光子自由度的高维纠缠。我们的研究结果可能为频率整形和干扰现象提供更全面的理解，并为更复杂的高维量子信息处理协议铺平道路。
High-dimensional quantum entanglement is currently one of the most prolific fields in quantum information processing due to its high information capacity and error resilience. A versatile method for harnessing high-dimensional entanglement has long been hailed as an absolute necessity in the exploration of quantum science and technologies. Here we exploit Hong-Ou-Mandel interference to manipulate discrete frequency entanglement in arbitrary-dimensional Hilbert space. The generation and characterization of two-, four- and six-dimensional frequency entangled qudits are theoretically and experimentally investigated, allowing for the estimation of entanglement dimensionality in the whole state space. Additionally, our strategy can be generalized to engineer higher-dimensional entanglement in other photonic degrees of freedom. Our results may provide a more comprehensive understanding of frequency shaping and interference phenomena, and pave the way to more complex high-dimensional quantum information processing protocols.