Quantum information processing is a rapidly growing field of research with fundamental implications as well as potential practical applications. We are actively investigating optical approaches to quantum computing and improved methods for quantum key distribution. Dr. Franson has theoretically predicted several new effects that have now been experimentally observed, including nonlocal interferometry (the Franson interferometer) and nonlocal dispersion cancellation. His group was one of the first to demonstrate quantum cryptography in optical fibers and the first to demonstrate it in free space. We were also the first to demonstrate quantum logic operations for photonic qubits, including the first CNOT gate. Dr. Franson is a Fellow of the American Physical Society and the Optical Society of America. Our early work in quantum computing included the development of linear optical approaches for quantum logic gates. In this approach, quantum logic gates are implemented by using the quantum measurement process to project the state of two input qubits into the desired output state, such as a controlled-NOT operation. This avoids the need for a nonlinear medium to produce the required interaction between the two input qubits, but it also gives a large increase in the number of resources required to implement the logic gates. Our more recent work makes use of nonlinear optical effects, such as the use of the quantum Zeno effect to suppress the failure events that would otherwise occur in optical logic gates. Dr. Franson is also involved in theoretical research in a variety of other areas, including quantum mechanics in curved spacetime and the interface between quantum optics and quantum electrodynamics.