Synthesis of time-bin entangled states via tailored group velocity matching
Alfred B. U’Ren, Reinhard K. Erdmann, Ian A. Walmsley · Journal of Modern Optics · 2005
We show that tailored group velocity matching in non-linear χ(2) crystal sequences interspersed with birefringent χ(1) compensators can be used to generate time-bin entangled states. By choosing the crystal and compensator materials appropriately it is possible to generate all four time-bin Bell states without resorting to time non-stationary devices. This scheme, in addition, lends itself well to the generation of higher-dimensionality states such as time-bin qutrits.