Large Quantum Delocalization of a Levitated Nanoparticle Using Optimal Control

Autor(en)

T. Weiss, M. Roda-Llordes, E. Torrontegui, M. Aspelmeyer, O. Romero-Isart

Abstrakt

We propose to optimally control the harmonic potential of a levitated nanoparticle to quantum delocalize its center-of-mass motional state to a length scale orders of magnitude larger than the quantum zero-point motion. Using a bang-bang control of the harmonic potential, including the possibility of inverting it, the initial ground-state-cooled levitated nanoparticle coherently expands to large scales and then contracts to the initial state in a time-optimal way. We show that this fast loop protocol can be used to enhance force sensing as well as to dramatically boost the entangling rate of two weakly interacting nanoparticles. We parameterize the performance of the protocol, and therefore the macroscopic quantum regime that could be explored, as a function of displacement and frequency noise in the nanoparticle's center-of-mass motion. This noise analysis accounts for the sources of decoherence relevant to current experiments.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Leopold-Franzens-Universität Innsbruck, Universidad Carlos III de Madrid, Spanish National Research Council (CSIC), Vienna Center for Quantum Science and Technology (VCQ)

Journal

Physical Review Letters

Band

127

Anzahl der Seiten

6

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.127.023601

Publikationsdatum

07-2021

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/23a9d52b-54e5-4ed3-9e72-0aca49c27225