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SUMMARY:Realizing quantum networks and secure computations using photons -
  Stefanie Barz (Oxford University)
DTSTART:20151130T153000Z
DTEND:20151130T170000Z
UID:TALK60781@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:In this talk I will present a series of experiments in the fie
 ld of photonic quantum information processing.\nIn the first part of the t
 alk\, I will show how quantum physics enables us to perform secure computa
 tions in quantum networks [1]. I will present experiments realizing both q
 uantum and classical secure delegated computations using quantum resources
 . In the quantum case\, this means that a nearly-classical client can acce
 ss the resources of a more powerful quantum server without divulging the c
 ontent of the requested computation [2\, 3]. Furthermore\, in the classica
 l case\, a classical client with limited computing capacity can delegate a
  classical computation securely using non-classical resources [4].\nIn the
  second part of the talk\, I will discuss multi-photon interference\, both
  in the context of fundamental quantum optics and in quantum information p
 rocessing. I will present an experiment\, which studies the interference o
 f multiple photons at multiport splitters. I will further give examples ho
 w such setups can be used for quantum information processing tasks.\n\n[1]
  A. Broadbent\, J. Fitzsimons and E. Kashefi\, in Proceedings of the 50th 
 Annual Symposium on Foundations of Computer Science\, 517 (2009)\n[2] S. B
 arz\, E. Kashefi\, A. Broadbent\, J. Fitzsimons\, A. Zeilinger\, and P. Wa
 lther\, Science 335\, 303 (2012)\n[3] S. Barz\, J. Fitzsimons\, E. Kashefi
 \, and P. Walther\, Nature Physics 9\, 727 (2013)\n[4] S. Barz\, V. Dunjko
 \, F. Schlederer\, M. Moore\, E. Kashefi\, I. A. Walmsley\, arXiv:1501.067
 30 (2015)\n
LOCATION:Rutherford building\, Seminar Room B
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