title: Non-classical photon correlation in a two-dimensional photonic lattice.
abstract: Quantum interference and quantum correlation, as two main features of quantum optics, play an essential role in quantum information applications, such as multi-particle quantum walk and boson sampling. While many experimental demonstrations have been done in one-dimensional waveguide arrays, it remains unexplored in higher dimensions due to tight requirement of manipulating and detecting photons in large-scale. Here, we experimentally observe non-classical correlation of two identical photons in a fully coupled two-dimensional structure, i.e. photonic lattice manufactured by three-dimensional femtosecond laser writing. Photon interference consists of 36 Hong-Ou-Mandel interference and 9 bunching. The overlap between measured and simulated distribution is up to 0.890 ± 0.001. Clear photon correlation is observed in the two-dimensional photonic lattice. Combining with controllably engineered disorder, our results open new perspectives towards large-scale implementation of quantum simulation on integrated photonic chips.
authors.forename: Jun
authors.initials: J
authors.lastname: Gao
authors.forename: Lu-Feng
authors.initials: LF
authors.lastname: Qiao
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Lin
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Jiao
authors.forename: Zhen
authors.initials: Z
authors.lastname: Feng
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhou
authors.forename: Zhen-Wei
authors.initials: ZW
authors.lastname: Gao
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Xu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Chen
authors.forename: Hao
authors.initials: H
authors.lastname: Tang
authors.forename: Xian-Min
authors.initials: XM
authors.lastname: Jin