极光超纠缠在偏振和频率方面通过联合频谱整形
Photonic hyperentanglement in polarisation and frequency via joint spectrum shaping
AI总结：
通过联合频谱整形实现偏振和频率的超纠缠光子对源，提供高维量子态的可扩展制备方法。
摘要：
超纠缠为量子信息处理和通信协议提供了增强的容量，尤其是在结合稳健的高维自由度如频率桶编码时。本文提出了一种单程、未过滤、下转换源，能够产生在偏振和频率桶自由度上的超纠缠光子对，其状态维度和组成可动态调节，在电信波长范围内。我们通过优化光子联合频谱幅度的泵浦和非线性形变来实现这一点。利用偏振分辨的时间飞行光谱和Hong-Ou-Mandel干涉，我们表征了超纠缠态，并展示了偏振成分的保真度超过99%，在频率桶上平均，以及超过98%的纠缠度。通过Hong-Ou-Mandel可见度量化光谱纠缠度，测得为90%，与数值模拟一致。这种方法为量子通信和计算应用的高维量子态提供了可扩展的路线。
英文摘要：
Hyperentanglement offers enhanced capacity for quantum information processing and communication protocols, especially in combination with robust high-dimensional degrees of freedom such as frequency-bin encoding. Here, we present a single-pass, unfiltered, down-conversion source of hyperentangled photon pairs in polarisation and frequency-bin degrees of freedom with dynamically tunable state dimension and composition at telecom wavelengths. We achieve this by optimal tailoring of the photons' joint spectral amplitude via pump and nonlinearity shaping. Using polarisation-resolved time-of-flight spectrometry and Hong-Ou-Mandel interference, we characterise the hyperentangled states and demonstrate for the polarisation component fidelities exceeding 99% averaged over frequency bins and concurrences above 98%. The degree of spectral entanglement, quantified by the Hong-Ou-Mandel visibility, is measured as 90%, well in line with numerical simulations. This approach provides a scalable route toward high-dimensional quantum states for quantum communication and computing applications.
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