English

Enhanced estimation of quantum properties with common randomized measurements

Quantum Physics 2024-04-05 v1

Abstract

We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about the quantum state of interest. This method involves performing randomized measurements on a quantum processor and comparing the results with those obtained from a classical computer that stores an approximation of the quantum state. We provide unbiased estimators for expectation values of multi-copy observables and present performance guarantees in terms of variance bounds which depend on the prior knowledge accuracy. We demonstrate the effectiveness of our approach through numerical experiments estimating polynomial approximations of the von Neumann entropy and quantum state fidelities.

Keywords

Cite

@article{arxiv.2304.12292,
  title  = {Enhanced estimation of quantum properties with common randomized measurements},
  author = {Benoît Vermersch and Aniket Rath and Bharathan Sundar and Cyril Branciard and John Preskill and Andreas Elben},
  journal= {arXiv preprint arXiv:2304.12292},
  year   = {2024}
}
R2 v1 2026-06-28T10:16:11.120Z