Biograph: Xi-Lin Wang now is a professor at Nanjing University. His research interest focus on quantum optics and quantum information with orbital angular momentum. His contribution as the main author include: the first quantum teleportation with multiple degrees of freedom, which was elected as “Breakthrough of the Year 2015” by IOP Physics World; the first ten-photon entanglement, refreshing the world record; and the first 18-qubit entanglement with six photons’ three degrees of freedom, which was reported by Phys. Org. with a title of “18-qubit entanglement sets new record”. He has so far published more than 30 articles in peer-reviewed journals, including 1 in Nature, 11 in Physical Review Letters, and his publications have attracted more than 1400 SCI citations.

Title: Quantum entanglement with photonic orbital angular momentum

Abstract: Orbital angular momentum (OAM) arising from the helical phase structure of a photon could be used to encode a qubit or a qudit. It plays an important role for the photonic quantum information processing since it could result in some unique functions such as entanglement with high momentum and in high dimension. In this talk, I will start with a brief introduction to OAM and a short review of the recent advances in OAM application in quantum information processing. Then, I will in particular talk about our work of applications of quantum entanglement with OAM. By simultaneously manipulating OAM and Spin angular momentum (SAM), we implemented the first quantum teleportation of multiple DoFs of a single photon [Nature 518, 516-519 (2015)]. Then, together with the high-brightness photon entanglement source for ten-photon entanglement [Phys. Rev. Lett. 117, 210502 (2016)], we successfully demonstrated the 18-qubit entanglement with six photons’ three degrees of freedom including SAM, OAM and path [Phys. Rev. Lett. 120, 260502 (2018)].