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arXiv · 1702.08294

Entanglement-enhanced radio-frequency field detection and waveform sensing

F. Martin Ciurana·G. Colangelo·L. Slodicka·R. J. Sewell·M. W. Mitchell
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Abstract

We demonstrate a new technique for detecting components of arbitrarily-shaped radio-frequency waveforms based on stroboscopic back-action evading measurements. We combine quantum non-demolition measurements and stroboscopic probing to detect waveform components with magnetic sensitivity beyond the standard quantum limit. Using an ensemble of $1.5\times 10^6$ cold rubidium atoms, we demonstrate entanglement-enhanced sensing of sinusoidal and linearly chirped waveforms, with 1.0(2)dB and 0.8(3)dB metrologically relevant noise reduction, respectively. We achieve volume-adjusted sensitivity of $\delta\rm{B}\sqrt{V}\approx 11.20~\rm{fT\sqrt{cm^3/Hz}}$, comparable to the best RF~magnetometers.

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F. Martin Ciurana, G. Colangelo, L. Slodicka, R. J. Sewell, M. W. Mitchell. 2017-02-27. Entanglement-enhanced radio-frequency field detection and waveform sensing. https://doi.org/10.1103/physrevlett.119.043603

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