High-precision measurement of the complex magneto-optical Kerr effect using weak measurement

TL;DR

This paper presents a quantum weak measurement technique that enables high-precision, simultaneous measurement of the complex magneto-optical Kerr effect parameters, improving efficiency and accuracy over traditional multi-step methods.

Contribution

The study introduces a novel weak measurement scheme for directly measuring the complex MOKE parameters in a single step, enhancing precision and reducing complexity.

Findings

Achieved measurement precision of $10^{-4}$ degrees for Kerr rotation and ellipticity.

Enabled simultaneous measurement of Kerr rotation and ellipticity.

Determined the complex magneto-optical constant $Q$ with high accuracy.

Abstract

The present paper introduces a quantum weak measurement (WM) scheme for the measurement of the complex magneto-optical Kerr effect (MOKE). We achieve the simultaneous measurement of the Kerr rotation angle and the ellipticity in a single WM process by utilizing two auxiliary pointers derived from the same meter state. The experimental measurement precision for both the Kerr rotation angle and the ellipticity is capable of reaching $10^{-4}$ deg. This technique is also employed for the determination of the complex magneto-optical constant $Q$. The proposed method overcomes the limitation of acquiring the complex magneto-optical Kerr parameters through a multi-step measurement process, which was previously encountered. This breakthrough holds immense significance for efficiently measuring and applying the complex MOKE with high precision and cost-effectiveness.