News & Events
Auxiliary Entanglement in Spontaneous Parametric Downconversion
Dr. Warren Grice Oak Ridge National Lab
Monday, November 5, 2012
3 p.m.4 p.m.
Sloan Auditorium
Abstract:
In most
photonic quantum information applications, information is encoded into the
photons’ polarization degrees of freedom. This is a natural choice, given that
polarization can be completely described by a linear combination of only two
basis states. It has experimental appeal, as well, since it is relatively easy
to manipulate polarization using simple optical elements. However, a more
complete description of the photon also includes its energy and its spatial
mode. And while it might seem that these have little to do with polarization,
it turns out that spatial and spectral entanglement can have adverse effects in
polarization entanglement experiments. I will discuss the source of these
auxiliary entanglements and will present a series of theoretical and
experimental results illustrating the subtle relationships between various
types of entanglement. Strategies for managing these auxiliary entanglements
will also be discussed.
Bio:
Dr. Warren Grice is a
senior research scientist at Oak Ridge National Laboratory and is the team lead
for Quantum Information Science. He conducts research primarily in the field of
quantum optics, particularly in the design and fabrication of novel sources of
entangled photons. Recent projects include entangled photon sources for Quantum
Key Distribution and Quantum Computing. Dr. Grice holds a B.S. in Physics from
Western Kentucky University and a Ph.D. in Optics from the University of
Rochester (1997), where his thesis work on ultrafast quantum optics was
completed under the direction of Ian Walmsley. Before coming to ORNL, Dr. Grice
was a member of the faculty of the Department of Physics at Southern Illinois
University Edwardsville.