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=== Variational quantum eigensolver ===
The VQE algorithm applies classical optimization to minimize the energy expectation of an [[Ansatz|ansatz state]] to find the ground state energy of a molecule.<ref>{{Cite journal|last=Peruzzo|first=Alberto|last2=McClean|first2=Jarrod|last3=Shadbolt|first3=Peter|last4=Yung|first4=Man-Hong|last5=Zhou|first5=Xiao-Qi|last6=Love|first6=Peter J.|last7=Aspuru-Guzik|first7=Alán|last8=O’Brien|first8=Jeremy L.|date=2014-07-23|title=A variational eigenvalue solver on a photonic quantum processor|journal=Nature Communications|language=En|volume=5|issue=1|pages=4213|doi=10.1038/ncomms5213|pmid=25055053|pmc=4124861|issn=2041-1723|arxiv=1304.3061|bibcode=2014NatCo...5E4213P}}</ref> This can also be extended to find excited energies of molecules.<ref>{{cite arxiv|last=Higgott|first=Oscar|last2=Wang|first2=Daochen|last3=Brierley|first3=Stephen|date=2018-05-21|title=Variational Quantum Computation of Excited States|eprint=1805.08138|class=quant-ph}}</ref>
==See also==
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