Quantum sensing on magnetic field inspired by Avian compass

TL;DR

This paper explores a quantum-inspired magnetic sensing method based on biological radical pair mechanisms, demonstrating how intra-radical coupling enhances sensitivity and offers a flexible, biologically inspired alternative to traditional sensors.

Contribution

It introduces a radical pair model inspired by avian magnetoreception, showing how intra-radical coupling improves magnetic sensing capabilities and flexibility.

Findings

Intra-radical coupling determines the sensing regime.

Coupled radical pairs enable a more flexible sensing scheme.

Quantum effects like entanglement enhance sensing performance.

Abstract

Magnetic measurement can be performed by various sensors, such as SQUID and Giant Magnetoresistance. This device can achieve high accuracy while losing efficiency and convenience. The model of biological magnetic sensing in avian proposes a radical pair response to the external field on the FLY results in regulating animal behaviour. Inspired by the radical pair system found in biological system, the effect of intra-radical coupling and the initial condition is studied in this simplified radical pair model as the quantum advantage results from entanglement and superposition are investigated in metrology. To identify the sensing benefit from the cooperation between the radical pairs, the inter-radical coupling is considered. We find the intra-radical coupling determines the sensing regime while the coupled radical pair system enables a new sensing scheme that provides a more general and flexible way for magnetic sensing in a broader range through a easier manipulation to the system.