Experimental realization of quantum Zeno dynamics for robust quantum metrology

TL;DR

This paper demonstrates experimentally how quantum Zeno dynamics can be used to enhance the robustness of quantum metrology against noise, by employing strong interactions during parameter encoding, validated on an NMR platform.

Contribution

It introduces a practical scheme utilizing quantum Zeno dynamics with strong interactions for noise-resistant quantum metrology, overcoming previous limitations.

Findings

Achieved near-optimal precision scaling under amplitude damping.

Validated the scheme experimentally on a nuclear magnetic resonance platform.

Numerical simulations show scalability and compatibility with other noise suppression techniques.

Abstract

Quantum Zeno dynamics (QZD), which restricts the system's evolution to a protected subspace, provides a promising approach for protecting quantum information from noise. Here, we explore a practical approach to harnessing QZD for robust quantum metrology. By introducing strong inter-particle interactions during the parameter encoding stage, we overcome the typical limitations of previous QZD studies, which have largely focused on single-particle systems and faced challenges where QZD could interfere with the encoding process. We experimentally validate the proposed scheme on a nuclear magnetic resonance platform, achieving near-optimal precision scaling under amplitude damping in both parallel and sequential settings. Numerical simulations further demonstrate the scalability of the approach and its compatibility with other control techniques for suppressing more general types of noise. These findings highlight QZD as a powerful strategy for noise-resilient quantum metrology.