Journal
PHYSICAL REVIEW A
Volume 100, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.100.022129
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Funding
- European 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]
- EPSRC [EP/K04057X/2] Funding Source: UKRI
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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 10 dB 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.
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