AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherPHYSICAL REVIEW A
CitationBranford, D., Gagatsos, C., Grover, J., Hickey, A., & Datta, A. (2019). Quantum enhanced estimation of diffusion. 100(2), Phys. Rev. A 100, 022129 (2019).
JournalAMER PHYSICAL SOC
RightsCopyright © 2019 American Physical Society
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractMomentum diffusion is a possible mechanism for driving macroscopic quantum systems towards classical behaviour. Experimental tests of this hypothesis rely on a precise estimation of the strength of this diffusion. We show that quantum-mechanical squeezing can offer significant improvements, which can be attained by general homodyne measurements including position measurement. With 10 dB of squeezing, experiments would require a tenth of proposed free-fall times. Quantum measurements---beyond study of position---could also allow for a more precise estimation. Our results suggest the potential for quantum enhanced estimation of heating and diffusive dynamics more generally.
VersionFinal published version
SponsorsEuropean Space Agency's Ariadna scheme [17-1201a]; U.K. EPSRC [EP/K04057X/2]; U.K. National Quantum Technologies Programme [EP/M01326X/1, EP/M013243/1]; COST Action QTSpace [CA15220]