Generation of Picosecond Pulsed Bright Squeezed Light With Perfect Vortex Distribution

Broadband bright squeezed states are important quantum resources that play a crucial role in quantum information and quantum measurement. Here, we present the broadband bright pulsed squeezed states generated by a single‐pass optical parametric amplification based on a custom‐poled potassium titanyl phosphate crystal. By optimizing the spatial mode of the picosecond pump beams, a bright squeezed light with 1.7 dB squeezing and output power of 5 mW is obtained. With a spatial light modulator, the spatial distribution of the bright squeezed light is shaped into perfect vortex beams with topological charges up to , while the squeezing level is 1.4 dB. The presented squeezed states provide essential resources for advanced quantum optics applications.