Recent experiments have demonstrated entanglement and encoding of quantum information in discrete photonic frequency bins. In this talk I describe manipulation and measurement of qubits and qudits encoded and entangled in superpositions of frequencies as well as other photonic degrees of freedom.
Trapped ion quantum computing has seen substantial progress in recent years, making a transition from proof-of-principle experiments to compuational systems. We will describe the optical systems approach to building a practical trapped ion quantum computers and the opportunities posed by photonics technology.