III. Quantum information
Driven-dissipative systems
Integrated quantum photonics combines high-density and high-performance functions on small footprint chips. In recent years, particular interest has been sparked by the possibility of exploiting the optical nonlinearities of silicon chips to generate multimode quantum states using frequency/time-like degrees of freedom. Our group has recently introduced the Bloch-Messiah analytical decomposition [Phys. Rev. Lett 125, 103601 (2020)] as a theoretical tool to decouple the complex dynamics of micro-resonators in terms of statistically independent observables that we have called morphing supermodes and to characterize their quantum properties. By applying this approach to light generated by a microresonator pumped in synchronous mode by a periodic train of pulses, we discovered [Phys. Rev. Research 5, 023178 (2023)] that traditional characterisation based on homodyne detection is incomplete because some quantum correlations (such as squeezing) remain hidden to this type of measurement. We have also studied classical solutions above threshold in CW pumping regimes and have characterized their quantum properties [Phys. Lett. A 493, 129272 (2024)]. On the other hand, ultrafast light pulses allow for studying system dynamics at ultrashort timescales and feature broad frequency comb structures used in high precision metrology. The field of ultrafast optics with coherent control techniques has flourished recently, leading to a rich toolbox for generating pulses with tailored temporal and spectral properties. Harnessing quantum features of light has driven progress in fundamental physics exploration, quantum communication, and quantum metrology.