Force-Gradient Sensing and Entanglement via Feedback Cooling of Interacting Nanoparticles

Henning Rudolph, Uroš Delić, Markus Aspelmeyer, Klaus Hornberger, Benjamin A. Stickler

Publications: Contribution to journalArticlePeer Reviewed


We show theoretically that feedback cooling of two levitated, interacting nanoparticles enables differential sensing of forces and the observation of stationary entanglement. The feedback drives the two particles into a stationary, nonthermal state which is susceptible to inhomogeneous force fields and which exhibits entanglement for sufficiently strong interparticle couplings. We predict that force-gradient sensing at the zepto-Newton per micron range is feasible and that entanglement due to the Coulomb interaction between charged particles can be realistically observed in state-of-the-art setups.
Original languageEnglish
Article number193602
Number of pages7
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 2 Nov 2022

Austrian Fields of Science 2012

  • 103025 Quantum mechanics

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