Title: Quantum Multi-photon Systems: Photonic Bound States and Their Applications

Abstract: Photonic bound states represent a new class of quantum multi-photon states. In these states, photons exhibit effective attraction and propagate together as a composite entity. Their strong inter-photon correlations offer promising advantages in quantum imaging, quantum communication, and quantum computing. While two- and three-photon bound states have been observed in cold-atom experiments, efficient generation in practical systems remains a significant challenge.

This dissertation tackles the challenges on two fronts. First, I design a solid-state platform to generate photonic-dimer coherent states—ensembles of two-photon bound states analogous to coherent states of single photons. The correlation functions and optical coherence properties of these states are analyzed in detail. Second, I show that their intrinsic photon-photon correlations enhance performance in turbulence-free interferometry and increase two-photon excitation efficiency, enabling deeper tissue imaging in two-photon fluorescence microscopy. Overall, this work advances our understanding of multi-photon quantum systems and expands the potential applications of photonic bound states in quantum technologies.

Title: Quantum Multi-photon Systems: Photonic Bound States and Their Applications

Abstract: Photonic bound states represent a new class of quantum multi-photon states. In these states, photons exhibit effective attraction and propagate together as a composite entity. Their strong inter-photon correlations offer promising advantages in quantum imaging, quantum communication, and quantum computing. While two- and three-photon bound states have been observed in cold-atom experiments, efficient generation in practical systems remains a significant challenge.

This dissertation tackles the challenges on two fronts. First, I design a solid-state platform to generate photonic-dimer coherent states—ensembles of two-photon bound states analogous to coherent states of single photons. The correlation functions and optical coherence properties of these states are analyzed in detail. Second, I show that their intrinsic photon-photon correlations enhance performance in turbulence-free interferometry and increase two-photon excitation efficiency, enabling deeper tissue imaging in two-photon fluorescence microscopy. Overall, this work advances our understanding of multi-photon quantum systems and expands the potential applications of photonic bound states in quantum technologies.