Colloquium: Milorad Cvijetic

    Thursday, September 26, 2013 - 3:30pm - 5:00pm
    Meinel 307

    "Optical Quantum Communications — What to Expect"


    Optical quantum communications and quantum key distribution have been considered the most secure forms of data transmission since it was determined that two parties communicating thusly could detect the presence of any third party attempting to access their exchanges. The detection of such eavesdropping comes from the fundamental fact of quantum mechanics that any intrusion (or measurement) in the quantum system — which in this case consists of transmitter, receiver and the quantum channel — would disturb the quantum state of transmitted photons. These principles are in contrast to the conventional secure communication schemes based on the computational complexity of certain mathematical algorithms.

    The utmost security of quantum communications has been appealing for a wide range of applications in both industry and government. Even though some important research advances in the field have recently been achieved, the lack of adequate transmission speed both over optical fibers and through free space limits its application area. Transmission distance over optical fibers is also limited by fiber losses and the lack of quantum amplification process, while impurities and turbulence limit the distance of transmission through free space.

    In this presentation, we will outline some of the most important research efforts on this subject, analyze the factors that determine the quantum communication rate in optical fibers and free-space optical channels, and point to future research directions.

    Speaker Bio(s): 

    Milorad Cvijetic is currently a professor in the College of Optical Sciences at the University of Arizona. He previously served as a vice president and chief technology strategist at NEC Corporation of America. For more than 30 years, he has been directly involved in state-of-the-art research and development in several of the world's leading telecommunication laboratories. Cvijetic was one of the pioneers of coherent optical communications, responsible for advancements in optical networking technologies including the first terabit transmission systems in the world's largest telecommunication network. He has published numerous technical papers, authored four books and authored or coauthored 12 U.S. patents, all related to optical communications and networking.