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Harvesting Multiqubit Entanglement from Ultrastrong Interactions in Circuit Quantum Electrodynamics

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Title: Harvesting Multiqubit Entanglement from Ultrastrong Interactions in Circuit Quantum Electrodynamics
Authors: Armata, F
Calajo, G
Jaako, T
Kim, MS
Rabl, P
Item Type: Journal Article
Abstract: We analyze a multi-qubit circuit QED system in the regime where the qubit-photon coupling dominates over the system’s bare energy scales. Under such conditions a manifold of low-energy states with a high degree of entanglement emerges. Here we describe a time-dependent protocol for extracting these quantum correlations and converting them into well-defined multi-partite entangled states of non-interacting qubits. Based on a combination of various ultrastrong-coupling effects the protocol can be operated in a fast and robust manner, while still being consistent with experimental constraints on switching times and typical energy scales encountered in superconducting circuits. Therefore, our scheme can serve as a probe for otherwise inaccessible correlations in strongly-coupled circuit QED systems. It also shows how such correlations can potentially be exploited as a resource for entanglement-based applications.
Issue Date: 1-Nov-2017
Date of Acceptance: 3-Oct-2017
URI: http://hdl.handle.net/10044/1/54703
DOI: https://dx.doi.org/10.1103/PhysRevLett.119.183602
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 119
Replaces: http://hdl.handle.net/10044/1/51543
10044/1/51543
Copyright Statement: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (E
The Royal Society
Funder's Grant Number: 317232
EP/K034480/1
WM140063
Keywords: 02 Physical Sciences
General Physics
Publication Status: Published
Article Number: 183602
Appears in Collections:Quantum Optics and Laser Science
Physics
Faculty of Natural Sciences



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