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PIRSA:19110130

Classical algorithms for quantum mean values

Gosset, D. (2019). Classical algorithms for quantum mean values. Perimeter Institute. https://pirsa.org/19110130

David Gosset Institute for Quantum Computing (IQC)

Talk numberPIRSA:19110130
DOI10.48660/19110130
Collection
Talk Type Conference
Subject

Abstract

Consider the task of estimating the expectation value of an n-qubit tensor product observable in the output state of a shallow quantum circuit. This task is a cornerstone of variational quantum algorithms for optimization, machine learning, and the simulation of quantum many-body systems. In this talk I will describe three special cases of this problem which are "easy" for classical computers. This is joint work with Sergey Bravyi and Ramis Movassagh.