Generation and time-domain characterization of picosecond pulsed squeezed vacuum from a Ti:sapphire-laser-pumped periodically poled lithium niobate waveguide

In recent years, quantum technology has expanded its reach across a wide range of fields. Pulsed squeezing, in particular, holds significant promise for advancing quantum-enhanced nonlinear microscopy as well as high-speed quantum computing and communication. However, the performance of pulsed squeezing using the widely adopted Ti:sapphire laser has been rarely investigated, especially in the picosecond regime. Here, we report record-level picosecond pulsed squeezing of −4.41 dB generated with a Ti:sapphire laser, together with a method for time-domain phase characterization of picosecond pulsed squeezed light. We anticipate that these results will promote the broader adoption of quantum systems based on the versatile, broadband-tunable Ti:sapphire platform, and foster a deeper understanding of pulsed squeezed light.