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SUMMARY:Variational Phase Estimation with Variational Fast Forwarding - Ma
 ria-Andreea Filip ( University of Cambridge)
DTSTART:20240606T110000Z
DTEND:20240606T130000Z
UID:TALK223363@talks.cam.ac.uk
CONTACT:Lila Cadi Tazi
DESCRIPTION:We present here a quantum circuit implementation of the variat
 ional quantum phase estimation (VQPE) algorithm\, which uses a series of t
 ime-evolved states as a basis for non-orthogonal configuration interaction
 . On an equally spaced time grid\, the diagonalisation of the Hamiltonian 
 can be replaced with a diagonalisation of a time-evolution matrix\, the co
 mputation of which scales linearly with the number of basis states. We com
 bine the VQPE approach with variational fast-forwarding (VFF)\, which prov
 ides a constant-depth approximation to time-evolution. This approximation 
 provides a good basis for Hamiltonian diagonalisation even when fidelity i
 s low and\, in the case of high-fidelity\, allows us to preserve the linea
 r scaling of the VQPE algorithm.\nThis is based on this paper : https://qu
 antum-journal.org/papers/q-2024-03-13-1278/
LOCATION:U203 Meeting room\, Department of Chemistry\, Cambridge
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