Protocols for Quantum Communication

We show how the techniques developed for long distance quantum key distribution in op-tical fibers can be used to demonstrate other quantum information processing and com-munication protocols. We present a fiber optics realization of the Deutsch-Jozsa and Bernstein-Vazirani algorithms. We describe a method, called ”error filtration”, for re-ducing errors in quantum communication channels, and present an experimental imple-mentation thereof. We discuss the cryptographic primitive of string flipping, and present an experimental implementation which has higher security than achievable using any classical protocol