Force-Gradient Sensing and Entanglement via Feedback Cooling of Interacting Nanoparticles
Henning Rudolph, Uroš Delić, Markus Aspelmeyer, Klaus Hornberger, Benjamin A. Stickler
Abstract
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.
Topics & Concepts
Quantum entanglementPhysicsCoulombRange (aeronautics)Classical mechanicsQuantum mechanicsQuantumMaterials scienceElectronComposite materialMechanical and Optical ResonatorsQuantum Information and CryptographyQuantum Electrodynamics and Casimir Effect