The joint spectral density (JSA) determines the multi-mode squeezed state generated through SPDC. The JSA is adjustable through the pump shape entering the SPOPO and the crystal phase matching condition.

We are making a double pump pulse shaper(DPPS) that can control the amplitude and phase of the pump on the frequency domain for two polarizations. Through this, we want to create a multi-mode squeeze state with complex entanglements such as H-graph state or cluster state.