Consistency testing for robust phase estimation

Journal Article · Thu Apr 15 00:00:00 EDT 2021 · Physical Review A

DOI:https://doi.org/10.1103/physreva.103.042609· OSTI ID:1828026

Russo, Antonio E. ^[1]; Kirby, William M. ^[2]; Rudinger, Kenneth M. ^[1]; Baczewski, Andrew D. ^[1]; Kimmel, Shelby ^[3]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
2. Tufts Univ., Medford, MA (United States)
3. Middlebury College, VT (United States)

In this work, we present an extension to the robust phase estimation protocol, which can identify incorrect results that would otherwise lie outside the expected statistical range. Robust phase estimation is increasingly a method of choice for applications such as estimating the effective process parameters of noisy hardware, but its robustness is dependent on the noise satisfying certain threshold assumptions. We provide consistency checks that can indicate when those thresholds have been violated, which can be difficult or impossible to test directly. We test these consistency checks for several common noise models, and identify two possible checks with high accuracy in locating the point in a robust phase estimation run at which further estimates should not be trusted. One of these checks may be chosen based on resource availability, or they can be used together in order to provide additional verification.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0003525
• OSTI ID: 1828026
• Report Number(s): SAND--2021-5437J; 695995
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 103; ISSN 2469-9926
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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