English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Calculating molecular energies is likely to be one of the first usefulapplications to achieve quantum supremacy, performing faster on a quantum thana classical computer. However, if future quantum devices are to produceaccurate calculations, errors due to environmental noise and algorithmicapproximations need to be characterized and reduced. In this study, we use thehigh performance qHiPSTER software to investigate the effects of environmentalnoise on the preparation of quantum chemistry states. We simulated eighteen16-qubit quantum circuits under environmental noise, each corresponding to aunitary coupled cluster state preparation of a different molecule or molecularconfiguration. Additionally, we analyze the nature of simple gate errors innoise-free circuits of up to 40 qubits. We find that the Jordan-Wigner (JW)encoding produces consistently smaller errors under a noisy environment ascompared to the Bravyi-Kitaev (BK) encoding. For the JW encoding,pure-dephasing noise is shown to produce substantially smaller errors than purerelaxation noise of the same magnitude. We report error trends in bothmolecular energy and electron particle number within a unitary coupled clusterstate preparation scheme, against changes in nuclear charge, bond length,number of electrons, noise types, and noise magnitude. These trends may proveto be useful in making algorithmic and hardware-related choices for quantumsimulation of molecular energies.

Error Sensitivity to Environmental Noise in Quantum Circuits for Chemical State Preparation