Energy gap calculation on near-term quantum hardware with robust phase estimation

Presenting Author: Antonio Russo, Sandia National Laboratories
Contributing Author(s): Andrew Baczewski, Benjamin Morrison, Kenneth Rudinger

Can alternative approaches to phase estimation yield better results for chemical simulation on NISQ hardware? Robust phase estimation (RPE) calculates the difference in phases between two eigenstates of a unitary, provided oracular access to that unitary and the relevant eigenstates. In contrast to conventional phase estimation, it does not require a controlled-U and is naturally resistant to state preparation and measurement errors. We evaluate the suitability of RPE on near-term hardware. In particular, we calculate of the energy landscapes of H_2 and H_3 on extant quantum hardware (pre-compiling to emulate hardware with significantly higher fidelities). Resource requirements for larger molecules are considered. Sandia National Labs is managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a subsidiary of Honeywell International, Inc., for the U.S. Dept. of Energy’s National Nuclear Security Administration under contract DE-NA0003525. The views expressed in this presentation do not necessarily represent the views of the DOE or the U.S. Government.

(Session 5 : Saturday from 5:00pm - 7:00pm)


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