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

authored by: 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.
Organisation(s): Institute of Theoretical Physics
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): Peking University
University of Copenhagen
University of Innsbruck
Austrian Academy of Sciences
Type: Article
Journal: Physical Review Letters
Volume: 121
ISSN: 0031-9007
Publication date: 05.09.2018
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Physics and Astronomy
Electronic version(s): https://doi.org/10.48550/arXiv.1801.02569 (Access: Open)
https://link.aps.org/accepted/10.1103/PhysRevLett.121.103602 (Access: Open)
https://doi.org/10.1103/PhysRevLett.121.103602 (Access: Closed)

BibTeX

@article{0812639a44a142b19a78d2b731237178,
title = "Unconditional Steady-State Entanglement in Macroscopic Hybrid Systems by Coherent Noise Cancellation",
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.",
author = "Xinyao Huang and Emil Zeuthen and Vasilyev, {Denis V.} and Qiongyi He and Klemens Hammerer and Polzik, {Eugene S.}",
note = "Publisher Copyright: {\textcopyright} 2018 American Physical Society.",
year = "2018",
month = sep,
day = "5",
doi = "10.48550/arXiv.1801.02569",
language = "English",
volume = "121",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "10",
}