A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is `application/pdf`

.

##
###
Classical algorithms for quantum mean values
[article]

2019
*
arXiv
*
pre-print

We consider the task of estimating the expectation value of an n-qubit tensor product observable O_1⊗ O_2⊗...⊗ O_n 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. Here we study its computational complexity for constant-depth quantum circuits and three types of single-qubit observables O_j which are (a) close to the identity, (b) positive

arXiv:1909.11485v1
fatcat:u5uxit3xrvepfbnfdc5zel3hme