Experimental Demonstration of a Cheap and Accurate Phase Estimation

Journal Article · 10 May 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.118.190502· OSTI ID:1361649

Rudinger, Kenneth ^[1]; Kimmel, Shelby ^[2]; Lobser, Daniel ^[3]; Maunz, Peter ^[3]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Computing Research
2. Univ. of Maryland, College Park, MD (United States). Joint Center for Quantum Information and Computer Science (QuICS)
3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We demonstrate an experimental implementation of robust phase estimation (RPE) to learn the phase of a single-qubit rotation on a trapped Yb⁺ ion qubit. Here, we show this phase can be estimated with an uncertainty below 4 × 10^-4 rad using as few as 176 total experimental samples, and our estimates exhibit Heisenberg scaling. Unlike standard phase estimation protocols, RPE neither assumes perfect state preparation and measurement, nor requires access to ancillae. We crossvalidate the results of RPE with the more resource-intensive protocol of gate set tomography.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: US Army Research Office (ARO); USDOE National Nuclear Security Administration (NNSA); USDOD
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1361649
• Alternate ID(s): OSTI ID: 1425566; OSTI ID: 1356741
• Report Number(s): SAND--2017-0108J; {"Journal ID: ISSN 0031-9007","Journal ID: ISSN PRLTAO",650211}
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 118; ISSN 0031-9007; ISSN PRLTAO
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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