Quantum Metrology Triangle Experiments: A Status Review

TL;DR

This paper reviews the history, current status, and future perspectives of Quantum Metrology Triangle experiments, which test fundamental relations between quantum electrical effects and constants, crucial for precision measurement and fundamental physics.

Contribution

It provides a comprehensive overview of Quantum Metrology Triangle experiments, highlighting recent results and discussing their implications for fundamental constants and quantum electrical effects.

Findings

Quantum Metrology Triangle experiments validate relations between fundamental constants.

Recent experiments have achieved increased measurement precision.

Implications for redefining SI units and understanding quantum effects.

Abstract

Quantum Metrology Triangle experiments combine three quantum electrical effects (the Josephson effect, the quantum Hall effect and the single-electron transport effect) used in metrology. These experiments allow important fundamental consistency tests on the validity of commonly assumed relations between fundamental constants of nature and the quantum electrical effects. This paper reviews the history, results and the present status and perspectives of Quantum Metrology Triangle experiments. It also reflects on the possible implications of results for the knowledge on fundamental constants and the quantum electrical effects.