Quantum enhanced estimation of diffusion

Dominic Branford, Christos N. Gagatsos, Jai Grover, Alexander J. Hickey, Animesh Datta

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish (US)
Article number022129
JournalPhysical Review A
Issue number2
StatePublished - Aug 30 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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