Sub-Shot-Noise Magnetometry with a Correlated Spin-Relaxation Dominated Alkali-Metal Vapor

Abstract

Spin noise sets fundamental limits to the precision of measurements using spin-polarized atomic vapors, such as performed with sensitive atomic magnetometers. Spin squeezing offers the possibility to extend the measurement precision beyond the standard quantum limit of uncorrelated atoms. Contrary to the current understanding, we show that even in the presence of spin relaxation, spin squeezing can lead to a significant reduction of spin noise, and hence an increase in magnetometric sensitivity, for a long measurement time. This is the case when correlated spin relaxation due to binary alkali-atom collisions dominates independently acting decoherence processes.

4 pages, submitted to Phys. Rev. Lett

References in corpus (1)

• Quantum Kalman Filtering and the Heisenberg Limit in Atomic Magnetometry

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• Spin-exchange collisions in hot vapors create and sustain bipartite entanglement
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• Quantum thermodynamic derivation of the energy resolution limit in magnetometry
• Zero-field spin noise spectrum of an alkali vapor with strong spin-exchange coupling
• Magnetic-field-independent spin-exchange relaxation-free magnetometer
• Quantum Zeno effect in atomic spin-exchange collisions
• Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing