Macroscopic superpositions and gravimetry with quantum magnetomechanics

Mattias T. Johnsson, Gavin K. Brennen, Jason Twamley*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)
23 Downloads (Pure)


Precision measurements of gravity can provide tests of fundamental physics and are of broad practical interest for metrology. We propose a scheme for absolute gravimetry using a quantum magnetomechanical system consisting of a magnetically trapped superconducting resonator whose motion is controlled and measured by a nearby RF-SQUID or flux qubit. By driving the mechanical massive resonator to be in a macroscopic superposition of two different heights our we predict that our interferometry protocol could, subject to systematic errors, achieve a gravimetric sensitivity of Δg/g ∼ 2.2 × 10-10 Hz-1/2, with a spatial resolution of a few nanometres. This sensitivity and spatial resolution exceeds the precision of current state of the art atom-interferometric and corner-cube gravimeters by more than an order of magnitude, and unlike classical superconducting interferometers produces an absolute rather than relative measurement of gravity. In addition, our scheme takes measurements at ∼10 kHz, a region where the ambient vibrational noise spectrum is heavily suppressed compared the ∼10 Hz region relevant for current cold atom gravimeters.

Original languageEnglish
Article number37495
Pages (from-to)1-13
Number of pages13
JournalScientific Reports
Publication statusPublished - 21 Nov 2016

Bibliographical note

Copyright the Author(s) 2016. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


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