Quantum sensing: Beyond the classical limits of precision

TL;DR

Quantum sensing leverages quantum physics to surpass classical limits in parameter estimation, enabling breakthroughs in gravitational, biological, and astronomical measurements, with recent advances addressing noisy system challenges.

Contribution

This paper reviews recent developments in quantum metrology, focusing on noisy systems and expanding the understanding of quantum sensors' capabilities.

Findings

Quantum sensors achieve higher precision than classical methods.

Recent results address noise challenges in quantum metrology.

Applications include gravitational, biological, and astronomical measurements.

Abstract

Quantum sensors allow the estimation of parameters with precision higher than that obtained with classical strategies. Devices based on quantum physics have allowed the precise estimation of the gravitational field, the detailed imaging of the brain, the detection of gravitational-wave sources more than 400 million light years away, and an ever-increasing precision in the measurement of time. Quantum metrology, which is the conceptual framework that encompasses all these devices, is reviewed here, emphasizing recent results regarding noisy systems.