Quantum computing with single photon qubits: Linear Optics Quantum Computing (LOQC), photonic quantum logic gates, quantum communication systems, and other topics in quantum information processing.
Quantum Entanglement: Parametric Down-Conversion (PDC) sources, entangled photon pairs, “entangled photon holes” (EPH’s), macroscopic phase-entangled coherent states, and other non-classical states for quantum information processing.
Ultralow-power nonlinear optics: Nanowatt and “few-photon” level nonlinearities using sub-wavelength diameter tapered optical nanofibers (ONF’s) suspended in atomic alkali vapors (Rubidium) and noble gases (metastable Xenon), and high-finesse optical cavities filled with noble gases (metastable Xenon).