# Experimental dissipative quantum sensing

## TL;DR

This paper introduces a dissipation-engineered quantum sensing method that leverages steady-state quantum systems to achieve high precision measurements without requiring complex initialization, enhancing robustness against decoherence.

## Contribution

The authors demonstrate a novel quantum sensing protocol that uses engineered dissipation to maintain coherence and improve performance, applicable to ensemble Nitrogen-Vacancy centers in diamond.

## Key findings

- Achieved magnetic sensing with frequency resolution beyond the sensor's coherence time.
- Engineered dissipation enhances sensing performance and broadens detectable frequency range.
- Method works without high-quality initialization or dynamical decoupling sequences.

## Abstract

Quantum sensing utilizes quantum systems as sensors to capture weak signal, and provides new opportunities in nowadays science and technology. The strongest adversary in quantum sensing is decoherence due to the coupling between the sensor and the environment. The dissipation will destroy the quantum coherence and reduce the performance of quantum sensing. Here we show that quantum sensing can be realized by engineering the steady-state of the quantum sensor under dissipation. We demonstrate this protocol with a magnetometer based on ensemble Nitrogen-Vacancy centers in diamond, while neither high-quality initialization/readout of the sensor nor sophisticated dynamical decoupling sequences is required. Thus our method provides a concise and decoherence-resistant fashion of quantum sensing. The frequency resolution and precision of our magnetometer are far beyond the coherence time of the sensor. Furthermore, we show that the dissipation can be engineered to improve the performance of our quantum sensing. By increasing the laser pumping, magnetic signal in a broad audio-frequency band from DC up to 140 kHz can be tackled by our method. Besides the potential application in magnetic sensing and imaging within microscopic scale, our results may provide new insight for improvement of a variety of high-precision spectroscopies based on other quantum sensors.