Single Spin Detection with Entangled States

TL;DR

This paper proposes a novel method using entangled states to enhance the speed and accuracy of single spin detection, overcoming noise limitations and improving sensitivity in quantum metrology.

Contribution

It introduces a strategy to utilize entanglement for detecting localized magnetic fields from single spins, advancing quantum sensing techniques.

Findings

Entanglement significantly boosts signal-to-noise ratio in single spin detection.

The method remains effective under realistic noise conditions.

Provides a practical approach for rapid and precise single spin measurement.

Abstract

Single spin detection is one of the important tasks in the field of quantum metrology. Many experiments about the single spin detection has been performed. However, due to the weak magnetic fields from the single spin, a long measurement time is required to achieve a reasonably high signal-to-noise ratio. Here, we propose an alternative way to realize rapid and accurate single spin detection with entangled states. While it is known that entanglement can improve the sensitivity to measure globally applied magnetic fields, we investigate a strategy to use the entanglement for detecting spatially inhomogeneous magnetic fields from the target single spin. We show that the entanglement significantly increases the signal to noise ratio for the single spin detection even under the effect of realistic noise. Our results pave the way for practical single spin detection.