Unconditional Steady-State Entanglement in Macroscopic Hybrid Systems by Coherent Noise Cancellation

verfasst von
Xinyao Huang, Emil Zeuthen, Denis V. Vasilyev, Qiongyi He, Klemens Hammerer, Eugene S. Polzik
Abstract

The generation of entanglement between disparate physical objects is a key ingredient in the field of quantum technologies, since they can have different functionalities in a quantum network. Here we propose and analyze a generic approach to steady-state entanglement generation between two oscillators with different temperatures and decoherence properties coupled in cascade to a common unidirectional light field. The scheme is based on a combination of coherent noise cancellation and dynamical cooling techniques for two oscillators with effective masses of opposite signs, such as quasispin and motional degrees of freedom, respectively. The interference effect provided by the cascaded setup can be tuned to implement additional noise cancellation leading to improved entanglement even in the presence of a hot thermal environment. The unconditional entanglement generation is advantageous since it provides a ready-to-use quantum resource. Remarkably, by comparing to the conditional entanglement achievable in the dynamically stable regime, we find our unconditional scheme to deliver a virtually identical performance when operated optimally.

Organisationseinheit(en)
Institut für Theoretische Physik
SFB 1227: Designte Quantenzustände der Materie (DQ-mat)
Externe Organisation(en)
Peking University
Københavns Universitet
Universität Innsbruck
Austrian Academy of Sciences
Typ
Artikel
Journal
Physical Review Letters
Band
121
ISSN
0031-9007
Publikationsdatum
05.09.2018
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Allgemeine Physik und Astronomie
Elektronische Version(en)
https://doi.org/10.48550/arXiv.1801.02569 (Zugang: Offen)
https://link.aps.org/accepted/10.1103/PhysRevLett.121.103602 (Zugang: Offen)
https://doi.org/10.1103/PhysRevLett.121.103602 (Zugang: Geschlossen)