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CATEGORIES:CQIF Seminar
SUMMARY:Classical simulation of photonic linear optics wit
h lost particles - MichaĆ Oszmaniec
DTSTART;TZID=Europe/London:20180425T141500
DTEND;TZID=Europe/London:20180425T151500
UID:TALK104446AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/104446
DESCRIPTION:We explore the possibility of efficient classical
simulation of linear optics experiments in the pre
sence of particle losses. Specifically\, we invest
igate the canonical boson sampling scenario in whi
ch an n-particle Fock input state propagates throu
gh a linear-optical network and is subsequently me
asured by particle-number detectors in the m outpu
t modes. We examine two models of losses. Inthe fi
rst model a fixed number of particles is lost. We
prove that in this scenario the output statistics
can be well approximated by an efficient classical
simulation\, provided that the number of photons
that is left grows slower than the square of the i
nitial number of particles. In the second loss mod
el\, a fraction of photons is lost as they pass th
rough every beamsplitter in the network. For this
model the relevant parameter is s\, the smallest
number of beamsplitters that any photon traverses
as it propagates through the network. We prove tha
t it is possible to approximately simulate the out
put statistics already if s grows logarithmically
with the number of modes m\, regardless of the geo
metry of the network. We believe that our findings
put strong limitations on future experimental rea
lizations of quantum supremacy proposals based on
boson sampling.
LOCATION:MR4\, Centre for Mathematical Sciences\, Wilberfor
ce Road\, Cambridge
CONTACT:Johannes Bausch
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