Since no one disagreed with the suggested time, it will be from 11:30 am to
12:30 pm on Fridays for the rest of the semester.
We will start with this schedule tomorrow with Ivan's talk:
*When:* Friday, February 4th 2011, 11:30 AM - 12:30 PM
*Where:* Mallinckrodt 217
*What:* It has recently become possible to use femtosecond lasers to
accurately write
waveguides in dielectric substrates. Such waveguides have shown to be ideal
means
of coherently implementing continuous-time quantum walks. We propose a
series of
experiments that would extend the current technology, both by adding
absorbing sites
to the quantum walk as well as by introducing controllable amounts of
decoherence.
The latter would be achieved by dynamic cross-Kerr modulation of the
refractive index
of the substrate. In particular, we propose a method for simulating an
observable level
of ENAQT on a one-dimensional lattice of sites. Furthermore, waveguide
arrays in
fused silica could offer an accurate simulation of the unitary dynamics of
exciton
delocalization in the B850 subunit of the light-harvesting system II of
Rhodobacter
sphaeroides purple bacteria. Adding decoherence to that simulation would
mimic the
interplay of coherent evolution and noise that is believed to play an
important role
in the efficiency of photosynthetic light harvesting.
--
Joel Yuen-Zhou
PhD candidate in Chemical Physics
Harvard University CCB,
12 Oxford St. Mailbox 107,
Cambridge, MA, USA.
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