Generating Two Continuous Entangled Microwave Beams Using a dc-Biased Josephson Junction
Artikel i vetenskaplig tidskrift, 2021

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.


Quantum Physics



A. Peugeot

Université Paris-Saclay

G. Menard

Université Paris-Saclay

S. Dambach

Universität Ulm

M. Westig

Université Paris-Saclay

B. Kubala

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Universität Ulm

Y. Mukharsky

Université Paris-Saclay

C. Altimiras

Université Paris-Saclay

P. Joyez

Université Paris-Saclay

D. Vion

Université Paris-Saclay

P. Roche

Université Paris-Saclay

D. Esteve

Université Paris-Saclay

P. Milman

Université Paris Descartes

J. Leppaekangas

Karlsruher Institut für Technologie (KIT)

Göran Johansson

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

M. Hofheinz

Université de Sherbrooke

J. Ankerhold

Universität Ulm

F. Portier

Université Paris-Saclay

Physical Review X

21603308 (eISSN)

Vol. 11 3 031008


Acceleratorfysik och instrumentering

Atom- och molekylfysik och optik

Annan fysik



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