Quantum enhanced optomechanical magnetometry

Bei-Bei Li, Jan Bilek, Ulrich Busk Hoff, Lars S. Madsen, Stefan Forstner, Varun Prakash, Clemens Schäfermeier, Tobias Gehring, Warwick P. Bowen*, Ulrik Lund Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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The resonant enhancement of both mechanical and optical response in microcavity optomechanical devices allows exquisitely sensitive measurements of stimuli, such as acceleration, mass, and magnetic fields. In this work, we show that quantum correlated light can improve the performance of such sensors, increasing both their sensitivity and their bandwidth. Specifically, we develop a silicon-chip-based cavity optomechanical magnetometer that incorporates phase squeezed light to suppress optical shot noise. At frequencies where shot noise is the dominant noise source, this allows a 20% improvement in magnetic field sensitivity. Furthermore, squeezed light broadens the range of frequencies at which thermal noise dominates, which has the effect of increasing the overall sensor bandwidth by 50%. These proof-of-principle results open the door to apply quantum correlated light more broadly in chip-scale sensors and devices.
Original languageEnglish
Article number850
Issue number7
Number of pages7
Publication statusPublished - 2018

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