High two-mode squeezing in a temporal Fourier cavity

Squeezed states of light are a key resource for quantum sensing, communication, and information processing, enabling measurements beyond the shot noise limit. However, generating highly squeezed and correlated quantum light in fiber-based platforms remains a challenge due to dispersion management, Raman noise, and limited control over nonlinear interactions. Here we demonstrate a temporal optical parametric oscillator based on a time-lens in a temporal 2f configuration. The cavity compensates multiple dispersion orders mismatch between the pump and the generated waves, maintaining temporal overlap throughout the nonlinear interaction and thereby enabling enhanced parametric gain and efficient cascading over a broad pump range. We observe high-brightness signal and idler generation with strong temporal correlations, and extract up to 9.2dB of two-mode squeezing, exceeding previously reported squeezing levels in fiber-based optical parametric oscillators. By comparing with conventional optical parametric oscillators and amplifiers, we show that the temporal configurations achieve significantly higher efficiency in generating bright correlated photon pairs. Our results establish temporal Fourier cavities as a powerful and efficient platform toward high-performance continuous-variable quantum light sources in Kerr nonlinear platforms.