Hybrid orbital angular momentum entangled state generation device

The invention discloses a hybrid orbital angular momentum entangled state generation device, and relates to the field of quantum optics. The generating device comprises a laser Pump, a half-wave plate HWP, a full-wave liquid crystal variable retarder VPR, a vortex wave plate WPV, a first polarization beam splitter PBS1, a first lens Lens 1, a periodically poled potassium titanyl phosphate crystal PPKTP, a second lens Lens 2, a cut-off filter and a second polarization beam splitter PBS2. Generating a hybrid orbital angular momentum beam using a combination of the VPR and the WPV; then, the linearly polarized light beams are filtered into linearly polarized light beams through PBS1, the linearly polarized light beams are focused on PPKTP through Lens1 to be subjected to an II-type spontaneous parametric down-conversion process, and then a hybrid orbital angular momentum entangled state is generated; and after being parallelly emitted by the Lens 2 and filtered by the Filter, the light is separated into two path