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CATEGORIES:Quantum Computing for Quantum Chemistry
SUMMARY:Variational Phase Estimation with Variational Fast
  Forwarding - Maria-Andreea Filip ( University of 
 Cambridge)
DTSTART;TZID=Europe/London:20240606T120000
DTEND;TZID=Europe/London:20240606T140000
UID:TALK223363AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/223363
DESCRIPTION:We present here a quantum circuit implementation o
 f the variational quantum phase estimation (VQPE) 
 algorithm\, which uses a series of time-evolved st
 ates as a basis for non-orthogonal configuration i
 nteraction. On an equally spaced time grid\, the d
 iagonalisation of the Hamiltonian can be replaced 
 with a diagonalisation of a time-evolution matrix\
 , the computation of which scales linearly with th
 e number of basis states. We combine the VQPE appr
 oach with variational fast-forwarding (VFF)\, whic
 h provides a constant-depth approximation to time-
 evolution. This approximation provides a good basi
 s for Hamiltonian diagonalisation even when fideli
 ty is low and\, in the case of high-fidelity\, all
 ows us to preserve the linear scaling of the VQPE 
 algorithm.\nThis is based on this paper : https://
 quantum-journal.org/papers/q-2024-03-13-1278/
LOCATION:U203 Meeting room\, Department of Chemistry\, Camb
 ridge
CONTACT:Lila Cadi Tazi
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