Generating entangled photons on monolithic chips is a significant progress towards real-life applications of optical quantum information processing such as quantum key distribution and quantum computing. Here we present our recent achievements in generating polarization entangled photons on monolithic III-V semiconductor chips without any off-chip component. We demonstrate the direct generation of broadband polarization entangled photons from a semiconductor chip for the first time with a record degree of entanglement. We also show an alternative approach for polarization entangled photon generation on the same epitaxial structure, which enabled a single chip generating both co-polarized and cross-polarized entangled photons. With recent progress on pump laser integration, our results pave the way for fully integrated entangled photon sources in the foreseeable future.
Dongpeng Kang, Nima Zareian, and Amr S. Helmy, "Generating entangled photons on monolithic chips," Proc. SPIE 10547, Advances in Photonics of Quantum Computing, Memory, and Communication XI, 105470Q (Presented at SPIE OPTO: January 31, 2018; Published: 22 February 2018); https://doi.org/10.1117/12.2293208.
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