Harnessing quantum chaos in spin-boson models for all-purpose quantum-enhanced sensing

TL;DR

This paper demonstrates how quantum chaos in the Dicke model can rapidly generate complex entangled states for quantum sensing, with a practical measurement scheme that is robust to noise and applicable in current experimental platforms.

Contribution

It introduces a method to harness chaos in the Dicke model for fast entangled state generation and develops a measurement protocol for quantum-enhanced sensing using only spin measurements.

Findings

Chaos enables rapid non-Gaussian entangled state creation.

Interaction-based readout allows practical quantum sensing.

The approach is robust to noise and experimental imperfections.

Abstract

Many-body quantum chaos has immense potential as a tool to accelerate the preparation of entangled states and overcome challenges due to decoherence and technical noise. Here, we study how chaos in the paradigmatic Dicke model, which describes the uniform coupling of an ensemble of qubits to a common bosonic mode, can enable the rapid generation of non-Gaussian entangled spin-boson states without fine tuning of system parameters or initial conditions. However, the complexity of these states means that unlocking their utility for quantum-enhanced sensing with standard protocols would require the measurement of complex or typically inaccessible observables. To address this challenge, we develop a sensing scheme based on interaction-based readout that enable us to implement near-optimal quantum-enhanced metrology of global spin rotations or bosonic dipslacements using only spin measurements. We show that our approach is robust to technical noise and imperfections and thus opens new opportunities to exploit complex entangled states generated by chaotic dynamics in current quantum science platforms such as trapped-ion and cavity-QED experiments.