The fruitful association of quantum and integrated photonics holds the promise to produce, manipulate, and detect quantum states of light using compact and scalable systems. Integrating all the building blocks necessary to produce high-quality photonic entanglement in the telecom-wavelength range out of a single chip remains a major challenge, mainly due to the limited performance of on-chip light rejection filters. We report a stand-alone, telecom-compliant device that integrates, on a single substrate, a nonlinear photon-pair generator and a passive pump-rejection filter. Using standard channel-grid fiber demultiplexers, we demonstrate the first entanglement qualification of such an integrated circuit, showing the highest raw quantum interference visibility for time-energy entangled photons over two telecom-wavelength bands. Genuinely pure, maximally entangled states can therefore be generated thanks to the high-level of noise suppression obtained with the pump filter. These results will certainly further promote the development of more advanced and scalable photonic-integrated quantum systems compliant with telecommunication standards.

量子与集成光子学的卓有成效的联系使人们有望使用紧凑且可扩展的系统来产生，操纵和检测光的量子态。将单个芯片集成到电信波长范围内以产生高质量的光子纠缠所必需的所有构件仍然是一个主要挑战，这主要是由于片上光抑制滤波器的性能有限。我们报告了一种独立的，电信兼容的设备，该设备在单个基板上集成了非线性光子对发生器和无源泵浦拒绝滤波器。使用标准的通道网格光纤多路分解器，我们证明了这种集成电路的第一个纠缠资格，显示了在两个电信波段上时间能量纠缠光子的最高原始量子干扰可见性。真正纯正 因此，由于泵滤器获得了高水平的噪声抑制，因此可以产生最大的纠缠状态。这些结果肯定会进一步促进符合电信标准的更先进和可扩展的光子集成量子系统的开发。