Measurement of superposition of orbit angular momentum states of photons by fork—like grating

Fangwei Ye, Li Yong-Ping, (1)中国科学技术大学物理系,合肥 230026; (2)中国科学技术大学物理系,合肥 230026;中国科学技术大学结构分析开放实验室,合肥 230026

Laguerre-Gaussian(LG) mode carries a well-defined orbit angular momentum. We have designed a fork-like grating to measure the superposition of two LG modes. It is useful in the high-dimensional quantum communication.

Jonathan Leach, Miles J. Padgett, Stephen Mark Barnett +2 more

Haiqing Wei, Xin Xue, Jonathan Leach +5 more

Fengwei Ye, Yongping Li

Laguerre-Gaussian (LG) mode carries a well-defined orbit angular momentum. We design a fork-like grating to produce the superposition of two LG modes. It is useful in the high-dimensional quantum communication.

Chuan Xu, Songtao Huang, Qian Yu +5 more

Three-dimensional (3D) nonlinear photonic crystal (NPC) has recently been realized in experiment, which provides a powerful platform for quantum-state engineering. Here, we propose a fork-grating 3D NPC scheme to manipulate orbital-angular-momentum (OAM) correlations of entangled two-photon pairs. The spiral spectra, bandwidths, and generation rates of counterpropagating and copropagating photon pairs are theoretically analyzed. Our results show that 3D NPC is of practical significance to generate high-dimensional OAM entanglement for quantum precision measurement, quantum computing, and quantum communication.

柯熙政 Ke Xizheng, Xue Pu