title: A 14 × 14 μm(2) footprint polarization-encoded quantum controlled-NOT gate based on hybrid waveguide.
abstract: Photonic quantum information processing system has been widely used in communication, metrology and lithography. The recent emphasis on the miniaturized photonic platform is thus motivated by the urgent need for realizing large-scale information processing and computing. Although the integrated quantum logic gates and quantum algorithms based on path encoding have been successfully demonstrated, the technology for handling another commonly used polarization-encoded qubits has yet to be fully developed. Here, we show the implementation of a polarization-dependent beam-splitter in the hybrid waveguide system. With precisely design, the polarization-encoded controlled-NOT gate can be implemented using only single such polarization-dependent beam-splitter with the significant size reduction of the overall device footprint to 14 × 14 μm(2). The experimental demonstration of the highly integrated controlled-NOT gate sets the stage to develop large-scale quantum information processing system. Our hybrid design also establishes the new capabilities in controlling the polarization modes in integrated photonic circuits.
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: S M
authors.initials: SM
authors.lastname: Wang
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Q Q
authors.initials: QQ
authors.lastname: Cheng
authors.affiliation: Department of Physics, Southeast University, Nanjing 211189, China.
authors.forename: Y X
authors.initials: YX
authors.lastname: Gong
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: P
authors.initials: P
authors.lastname: Xu
authors.affiliation: Department of Mechanical Engineering, Northwestern University, Evanston, Illinosis 60208-3111, USA.
authors.forename: C
authors.initials: C
authors.lastname: Sun
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: T
authors.initials: T
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: S N
authors.initials: SN
authors.lastname: Zhu