Quantum Sensing with Joint Emitter-Fluorescence Measurements

TL;DR

This paper introduces a model for driven quantum emitters emitting resonance fluorescence, analyzing quantum correlations and proposing joint measurement strategies for quantum sensing applications across various physical platforms.

Contribution

It provides an analytically solvable model to characterize early-time quantum correlations and suggests measurement techniques to detect quantum signatures in fluorescence.

Findings

Quantum correlations between drive, emitter, and fluorescence are characterized.

Joint measurements can reveal quantum noise of the driving field.

Applications to quantum sensing in optics, acoustics, and gravity are discussed.

Abstract

We present an analytically tractable model of a driven quantum harmonic emitter, such as an oscillating charged dipole, emitting radiation via resonance fluorescence. With this model we are able to characterize the quantum mechanical correlations that are built up at early times between the drive, the resonant emitter, and its fluorescence. We describe detection strategies that can reveal these quantum signatures in experiments by performing joint measurements on the quantum emitter and its fluorescence field. In particular, we show that simultaneous quantum measurements of a driven quantum emitter and its fluorescence can be used to probe the quantum noise of the driving field, relative to the maximally classical coherent state of the driving field, in short-time experiments. We conclude by discussing the applications to quantum sensing in quantum optical, quantum acoustic, and quantum gravitational scenarios of interest.