Entanglement-assisted multiparameter estimation with a solid-state quantum sensor

TL;DR

This paper demonstrates a practical solid-state quantum sensor using NV centers in diamond to simultaneously estimate multiple parameters with high precision, leveraging entanglement and optimized measurements at room temperature.

Contribution

It introduces an experimental method for multiparameter estimation with NV centers, achieving linear sensitivity scaling under realistic conditions.

Findings

Simultaneous estimation of amplitude, detuning, and phase from a single measurement.

Achieved linear sensitivity scaling for all parameters with respect to interrogation time.

Bridged quantum estimation theory and practical quantum sensing applications.

Abstract

Quantum multiparameter estimation promises to extend quantum advantage to the simultaneous high-precision measurements of multiple physical quantities. However, realizing this capability in practical quantum sensors under realistic conditions remains challenging due to intrinsic system imperfections. Here, we experimentally demonstrate multiparameter estimation using a nitrogen-vacancy (NV) center in diamond, a widely adopted solid-state quantum sensor. Leveraging electronic-nuclear spin entanglement and optimized Bell state measurement at room temperature, we simultaneously estimate the amplitude, detuning, and phase of a microwave drive from a single measurement sequence. Despite practical constraints, our results achieve linear sensitivity scaling for all parameters with respect to interrogation time. This work bridges the gap between foundational quantum estimation theory and real-world quantum sensing, opening pathways toward enhanced multiparameter quantum sensors suitable for diverse scientific and technological applications.