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

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 cohe...

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Autores principales:	A. Peugeot, G. Ménard, S. Dambach, M. Westig, B. Kubala, Y. Mukharsky, C. Altimiras, P. Joyez, D. Vion, P. Roche, D. Esteve, P. Milman, J. Leppäkangas, G. Johansson, M. Hofheinz, J. Ankerhold, F. Portier
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/f74e20aae8d54565825ba90ebcb25cad
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spelling	oai:doaj.org-article:f74e20aae8d54565825ba90ebcb25cad2021-12-02T18:32:55ZGenerating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction10.1103/PhysRevX.11.0310082160-3308https://doaj.org/article/f74e20aae8d54565825ba90ebcb25cad2021-07-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031008http://doi.org/10.1103/PhysRevX.11.031008https://doaj.org/toc/2160-3308We 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.A. PeugeotG. MénardS. DambachM. WestigB. KubalaY. MukharskyC. AltimirasP. JoyezD. VionP. RocheD. EsteveP. MilmanJ. LeppäkangasG. JohanssonM. HofheinzJ. AnkerholdF. PortierAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031008 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 A. Peugeot G. Ménard S. Dambach M. Westig B. Kubala Y. Mukharsky C. Altimiras P. Joyez D. Vion P. Roche D. Esteve P. Milman J. Leppäkangas G. Johansson M. Hofheinz J. Ankerhold F. Portier Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
description	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.
format	article
author	A. Peugeot G. Ménard S. Dambach M. Westig B. Kubala Y. Mukharsky C. Altimiras P. Joyez D. Vion P. Roche D. Esteve P. Milman J. Leppäkangas G. Johansson M. Hofheinz J. Ankerhold F. Portier
author_facet	A. Peugeot G. Ménard S. Dambach M. Westig B. Kubala Y. Mukharsky C. Altimiras P. Joyez D. Vion P. Roche D. Esteve P. Milman J. Leppäkangas G. Johansson M. Hofheinz J. Ankerhold F. Portier
author_sort	A. Peugeot
title	Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
title_short	Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
title_full	Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
title_fullStr	Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
title_full_unstemmed	Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
title_sort	generating two continuous entangled microwave beams using a dc-biased josephson junction
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/f74e20aae8d54565825ba90ebcb25cad
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Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction

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