Fibre based hyperentanglement generation for dense wavelength division multiplexing

Entanglement is a key resource in quantum information science and associated technologies. Photonic systems offer a large range of exploitable degrees of freedom such as frequency, time, polarization, and modes. Hyperentangled photons exploit multiple degrees of freedom to enhance the performance of quantum information protocols., we report a fully guided-wave approach for generating polarization and-time hyperentangled photons at telecom wavelengths. Moreover, by the broadband emission spectrum of the source into five standard channel pairs, we demonstrate compliance with fibre network standards improve the effective bit rate capacity of the quantum channel up to one of magnitude. In all channel pairs, we observe a violation of a Bell inequality by more than 27 standard deviations, underlining relevance of our approach.