Both single photons and squeezed light are forms of quantum light which offer a wide range of possible applications, from testing fundamental quantum theories to encoding quantum information for use in computing and communication. Of particular significance is their use within the fast developing field of photonic quantum computing, which uses photons to perform quantum algorithms and solve specific problems that are computationally difficult with classical computers.

The target of our research is to generate a highly-squeezed, spectrally factorisable quantum state. Our method is based upon parametric down conversion (PDC), a common technique in quantum optics because of its ability to operate at room temperature and its robustness in experiments involving a high power pump laser. Using PDC to prepare squeezed states often results in quantum states which are mixed, containing significant frequency correlations, or providing low levels of squeezing. We mitigate these dilemmas by introducing a pulsed pump laser and a cavity that is resonant with all the fields involved in the PDC process. Together these can improve both the spectral purity and degree of squeezing experienced by the quantum state.

This thesis presents an experimental demonstration of quantum state generation based on PDC inside a triply resonant cavity, using a pulsed pump. An initial theoretical proposal is outlined, which later motivates a description of the cavity design. The cavity tuning process is then described in detail, leading to a discussion of experimental findings. The well-tuned cavity is employed to observe nonlinear effects with a continuous-wave pump. Finally, a pulsed pump system is implemented to generate spectrally-uncorrelated photon pairs.