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Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction

Peugeot, A.; Ménard, G.; Dambach, S.; Westig, M.; Kubala, B.; Mukharsky, Y.; Altimiras, C.; Joyez, P.; Vion, D.; Roche, P.; Esteve, D.; Milman, P.; Leppäkangas, J. 1; Johansson, G.; Hofheinz, M.; Ankerhold, J.; Portier, F.
1 Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT)


We show experimentally that a dc-biased Josephson junction in series with two microwave resonators emits entangled beams of microwaves leaking out of the resonators. In the absence of a stationary phase reference for characterizing the entanglement of the outgoing beams, we measure second-order coherence functions to prove the entanglement. The experimental results are found in quantitative agreement with theory, proving that the low-frequency noise of the dc bias is the main limitation for the coherence time of the entangled beams. This agreement allows us to evaluate the entropy of entanglement of the resonators, estimate the entanglement flux at their output, and to identify the improvements that could bring this device closer to a useful bright source of entangled microwaves for quantum-technological applications.

Verlagsausgabe §
DOI: 10.5445/IR/1000136620
Veröffentlicht am 23.08.2021
DOI: 10.1103/PhysRevX.11.031008
Zitationen: 9
Web of Science
Zitationen: 9
Zitationen: 14
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2160-3308
KITopen-ID: 1000136620
Erschienen in Physical review / X
Verlag American Physical Society (APS)
Band 11
Heft 3
Seiten Art. Nr.: 031008
Vorab online veröffentlicht am 13.07.2021
Nachgewiesen in Web of Science
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