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Seminars:  May 2008

• Thu 5/8, 3:30PM in Room 184                   print event

  N. Bonesteel
  Braiding and Entanglement in Non-Abelian Quantum Hall States

  Fractional quantum Hall states exhibit a unique kind of quantum order known as topological order. Certain of these states, which have been experimentally observed, may have a sufficiently rich form of this order (i.e., they may be "Non-Abelian") to be used for so-called topological quantum computation, an intrinsically fault tolerant form of quantum computation which is carried out by braiding the world lines of quasiparticle excitations in 2+1 dimensional space time. In this talk I will review the properties of non-Abelian quantum Hall states and discuss some of the methods we have found for finding specific braiding patterns which can be used to carry out universal quantum computation using them. I will also discuss recent work on one-dimensional chains of "interacting" quasiparticles in non-Abelian states, focusing on their entanglement scaling at quantum critical points.

• Thu 5/1, 3:30PM in Room 184                   print event

  Zhao Zhi
  Multi-photon entanglement for quantum information processing

  Multiparticle entangled states are at the basis for almost all the protocols for the distributed quantum information processing. Yet, the challenge is to be able to generate and manipulate particles well enough to carry out the various tasks. In this talk, I will report on the generation of bright sources of three-photon entanglement, four-photon entanglement, and the first five-photon entanglement. I will also discuss how to manipulate multi-photon entanglement for the variety of applications in quantum information science, such as entanglement concentration, quantum telecloning, open-destination teleportation and linear optics quantum computing.