  Quantum information science breaks limitations of conventional information
transfer, cryptography and computation by using quantum superpositions or
entanglement as resources for information processing. Here, we report on the
experimental realization of three-party quantum communication protocols using
single three-level quantum system (qutrit) communication: secret sharing,
detectable Byzantine agreement, and communication complexity reduction for a
three-valued function. We have implemented these three schemes using the same
optical fiber interferometric setup. Our realization is easily scalable without
sacrificing detection efficiency or generating extremely complex many-particle
entangled states.
