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Parity-Assisted Generation of Nonclassical States of Light in Circuit Quantum Electrodynamics

1
Departamento de Física, Universidad de Santiago de Chile (USACH), Avenida Ecuador 3493, Santiago 9170124, Chile
2
Center for the Development of Nanoscience and Nanotechnology, Estación Central, Santiago 9170124, Chile
3
Department of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, 48080 Bilbao, Spain
4
IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
5
Department of Physics, Shanghai University, Shanghai 200444, China
*
Authors to whom correspondence should be addressed.
Symmetry 2019, 11(3), 372; https://doi.org/10.3390/sym11030372
Received: 29 January 2019 / Revised: 5 March 2019 / Accepted: 9 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Symmetry in Quantum Optics Models)
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Abstract

We propose a method to generate nonclassical states of light in multimode microwave cavities. Our approach considers two-photon processes that take place in a system composed of N extended cavities and an ultrastrongly coupled light–matter system. Under specific resonance conditions, our method generates, in a deterministic manner, product states of uncorrelated photon pairs, Bell states, and W states in different modes on the extended cavities. Furthermore, the numerical simulations show that the generation scheme exhibits a collective effect which decreases the generation time in the same proportion as the number of extended cavity increases. Moreover, the entanglement encoded in the photonic states can be transferred towards ancillary two-level systems to generate genuine multipartite entanglement. Finally, we discuss the feasibility of our proposal in circuit quantum electrodynamics. This proposal could be of interest in the context of quantum random number generator, due to the quadratic scaling of the output state. View Full-Text
Keywords: microwave photons; quantum entanglement; superconducting circuits; circuit quantum electrodynamics; quantum Rabi model microwave photons; quantum entanglement; superconducting circuits; circuit quantum electrodynamics; quantum Rabi model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cárdenas-López, F.A.; Romero, G.; Lamata, L.; Solano, E.; Retamal, J.C. Parity-Assisted Generation of Nonclassical States of Light in Circuit Quantum Electrodynamics. Symmetry 2019, 11, 372.

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