Abstracts
Poster Abstracts | Talk Abstracts
Demonstration of a large-scale quantum chemistry calculations using the Sycamore quantum processor
Presenting Author: Nicholas Rubin, Google
Variational simulation of quantum chemistry is a likely first application for noisy intermediate scale quantum (NISQ) computers in the post supremacy age. We simulate a chemistry model that is significantly larger than previous implementations on any quantum computing platform. The model is optimized through a variational outer loop and a new iterative method based on the generalized Brillouin stopping condition that allows for the use of an approximate Hessian. Upon application of an error mitigation scheme based on pure-state n-representability conditions our experiments run on Google’s Sycamore quantum processor achieve chemical accuracy. The model provides an efficiently verifiable circuit that has a large degree of entanglement and is a circuit primitive for fermionic simulation. More broadly, we demonstrate how this fermionic simulation circuit primitive can be used to benchmark large-scale devices.
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