Dephasing-tolerant quantum sensing for transverse magnetic fields with spin qudits

TL;DR

This paper introduces a quantum sensing protocol using spin qudits with fault-tolerant error correction, enabling detection of extremely small transverse magnetic fields despite dephasing.

Contribution

It presents a novel dephasing-tolerant quantum sensing method employing spin qudits and fault-tolerant error correction for enhanced magnetic field detection.

Findings

Enables detection of fields below coherence time limits

Uses longitudinal drives to induce logical Rabi oscillations

Numerical simulations confirm high sensitivity

Abstract

We propose a dephasing-tolerant protocol for quantum sensing of transverse magnetic fields which exploits spin qudit sensors with embedded fault-tolerant (FT) quantum error correction. By exploiting longitudinal drives, the transverse field induces logical Rabi oscillations between encoded states, whose frequency is linear in the transverse field to be probed. Numerical simulations show that the present FT protocol enables the detection of very small fields, orders of magnitudes below the limit imposed by the coherence time.