论文标题
片上的杂种偏振频率纠结的双孔状态
On-chip generation of hybrid polarization-frequency entangled biphoton states
论文作者
论文摘要
我们展示了一个结合了极化和频率纠缠的芯片集成的半导体来源，从而使纠缠的双孔状态在杂种自由度中产生而没有后的操作后。我们的藻类设备基于II型自发参数下转化（SPDC）在反向传播相匹配方案中，其中模态双折射可以提高两种可能的非线性相互作用之间的退化。这允许在室温和电信波长下直接生成偏振频率纠缠的光子，并以两种不同的空间模式，为量子信息协议提供了增强的灵活性。国家纠缠是通过对两光子的关节光谱和洪 - 曼德尔干扰的联合测量来量化的，从而可以重建混合极化频率空间中的受限密度基质。
We demonstrate a chip-integrated semiconductor source that combines polarization and frequency entanglement, allowing the generation of entangled biphoton states in a hybrid degree of freedom without postmanipulation. Our AlGaAs device is based on type-II spontaneous parametric down-conversion (SPDC) in a counterpropagating phase-matching scheme, in which the modal birefringence lifts the degeneracy between the two possible nonlinear interactions. This allows the direct generation of polarization-frequency entangled photons, at room temperature and telecom wavelength, and in two distinct spatial modes, offering enhanced flexibility for quantum information protocols. The state entanglement is quantified by a combined measurement of the joint spectrum and Hong-ou-Mandel interference of the biphotons, allowing to reconstruct a restricted density matrix in the hybrid polarization-frequency space.
