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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:A variational eigenvalue solver on a quantum proce
ssor - McClean\, J (Harvard University)
DTSTART;TZID=Europe/London:20131128T100000
DTEND;TZID=Europe/London:20131128T110000
UID:TALK49084AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/49084
DESCRIPTION:Co-authors: Alberto Peruzzo (University of Sydney)
\, Peter Shadbolt (University of Bristol)\, Man-Ho
ng Yung (Tsinghua University)\, Xiao-Qi Zhou (Univ
ersity of Bristol)\, Peter Love (Haverford College
)\, Alan Aspuru-Guzik (Harvard University)\, Jerem
y O'Brien (University of Bristol) \n\nQuantum comp
uters promise to efficiently solve important probl
ems that are intractable on a conventional compute
r. For quantum systems\, where the dimension of th
e problem space grows exponentially\, finding the
eigenvalues of certain operators is one such intra
ctable problem and remains a fundamental challenge
. The quantum phase estimation algorithm can effic
iently find the eigenvalue of a given eigenvector
but requires fully coherent evolution. We present
an alternative approach that greatly reduces the r
equirements for coherent evolution and we combine
this method with a new approach to state preparati
on based on ans"atze and classical optimization. W
e have implemented the algorithm by combining a sm
all-scale photonic quantum processor with a conven
tional computer. We experimentally demonstrate the
feasibility of this approach with an example from
quantum chemistry: calculating the ground state m
olecular energy for He-H+\, to within chemical acc
uracy. The proposed appro ach\, by drastically red
ucing the coherence time requirements\, enhances t
he potential of the quantum resources available to
day and in the near future.\n
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:Mustapha Amrani
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