论文标题
结构化量子光的过度牙
Hyperentanglement in structured quantum light
论文作者
论文摘要
高维量子系统中涉及一个或多个光度自由度的高维量子系统中的纠缠，提供了增加的信息能力，并启用了新的量子协议。在这里，我们演示了在时间频率和矢量涡流结构化模式中编码的高维，噪声超牢固状态的功能来源，进而在极化和轨道角度动量之间携带单粒子纠缠。在干涉方案中与旋转到轨道 - 角度 - 角度转换的非线性工程参数下调配对，我们在电信波长处生成高度纠缠的光子对，我们通过两光子干扰和量子状态层析成像来表征，实现近乎不合情的态度和近似阶层。虽然在光子Qubit中已经证明了超脑性能，但这是涉及光谱和空间结构的光线结构的第一个实例，其中三种不同形式的纠缠在同一biphoton状态下共存。
Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes, which in turn carry single-particle entanglement between polarisation and orbital angular momentum. Pairing nonlinearity-engineered parametric downconversion in an interferometric scheme with spin-to-orbital-angular-momentum conversion, we generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities. While hyperentanglement has been demonstrated before in photonic qubits, this is the first instance of such a rich entanglement structure involving spectrally and spatially structured light, where three different forms of entanglement coexist in the same biphoton state.
