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Quantum enhanced estimation of diffusion
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Branford, Dominic, Gagatsos, Christos N., Grover, Jai, Hickey, Alexander J. and Datta, Animesh (2019) Quantum enhanced estimation of diffusion. Physical Review A, 100 (2). 022129 . doi:10.1103/physreva.100.022129
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Official URL: https://doi.org/10.1103/physreva.100.022129
Abstract
Momentum diffusion is a possible mechanism for driving macroscopic quantum systems towards classical behavior. Experimental tests of this hypothesis rely on a precise estimation of the strength of this diffusion. We show that quantum-mechanical squeezing offers significant improvements, including when measuring position. For instance, with 10dB of mechanical squeezing, experiments would require a tenth of proposed free-fall times. Momentum measurement is better by an additional factor of three, while another quadrature is close to optimal. These have particular implications for the space-based MAQRO proposal—where it could rule out the spontaneous collapse theory due to Ghirardi, Rimini, and Weber—as well as terrestrial optomechanical sensing.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Momentum (Mechanics) , Quantum systems , Fokker-Planck equation , Quantum optics, Signal detection, Diffusion | |||||||||||||||
Journal or Publication Title: | Physical Review A | |||||||||||||||
Publisher: | American Physical Society (APS) | |||||||||||||||
Official Date: | 30 August 2019 | |||||||||||||||
Dates: |
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Volume: | 100 | |||||||||||||||
Number: | 2 | |||||||||||||||
Article Number: | 022129 | |||||||||||||||
DOI: | 10.1103/physreva.100.022129 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Copyright Holders: | ©2019 American Physical Society | |||||||||||||||
Date of first compliant deposit: | 21 October 2019 | |||||||||||||||
Date of first compliant Open Access: | 21 October 2019 | |||||||||||||||
RIOXX Funder/Project Grant: |
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