Phys. Rev. A 102, 012208 (2020) - Achieving higher precision in quantum parameter estimation with feedback controls

Achieving higher precision in quantum parameter estimation with feedback controls

Liqiang Liu and Haidong Yuan

Phys. Rev. A 102, 012208 – Published 8 July 2020

Abstract

We study the effect of feedback controls in quantum parameter estimation. In particular, we study the estimation of a magnetic field with a spin in the presence of the spontaneous emission where feedback control, triggered by the detection of the emitted photons, is employed to improve the precision limit. We also study the effect of additional Hamiltonian controls and show that they can provide further improvement on the precision limit.

Received 30 October 2019
Revised 27 April 2020
Accepted 11 June 2020

DOI:https://doi.org/10.1103/PhysRevA.102.012208

©2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum control Quantum metrology

Quantum Information, Science & Technology

Authors & Affiliations

Liqiang Liu and Haidong Yuan ^*

Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong

^*hdyuan@mae.cuhk.edu.hk

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Issue

Vol. 102, Iss. 1 — July 2020

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