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@article{Armata:2017:10.1103/PhysRevLett.119.183602,
author = {Armata, F and Calajo, G and Jaako, T and Kim, MS and Rabl, P},
doi = {10.1103/PhysRevLett.119.183602},
journal = {Physical Review Letters},
title = {Harvesting Multiqubit Entanglement from Ultrastrong Interactions in Circuit Quantum Electrodynamics},
url = {http://dx.doi.org/10.1103/PhysRevLett.119.183602},
volume = {119},
year = {2017}
}

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TY  - JOUR
AB  - We analyze a multi-qubit circuit QED system in the regime where the qubit-photon couplingdominates over the system’s bare energy scales. Under such conditions a manifold of low-energystates with a high degree of entanglement emerges. Here we describe a time-dependent protocol forextracting these quantum correlations and converting them into well-defined multi-partite entangledstates of non-interacting qubits. Based on a combination of various ultrastrong-coupling effects theprotocol can be operated in a fast and robust manner, while still being consistent with experimentalconstraints 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-coupledcircuit QED systems. It also shows how such correlations can potentially be exploited as a resourcefor entanglement-based applications.
AU  - Armata,F
AU  - Calajo,G
AU  - Jaako,T
AU  - Kim,MS
AU  - Rabl,P
DO  - 10.1103/PhysRevLett.119.183602
PY  - 2017///
SN  - 0031-9007
TI  - Harvesting Multiqubit Entanglement from Ultrastrong Interactions in Circuit Quantum Electrodynamics
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/PhysRevLett.119.183602
UR  - http://hdl.handle.net/10044/1/51543
VL  - 119
ER  -

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Professor Myungshik Kim

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