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.
Superconductivity
Quantum Physics
Mesoscopics
Författare
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 031008Ämneskategorier
Acceleratorfysik och instrumentering
Atom- och molekylfysik och optik
Annan fysik
DOI
10.1103/PhysRevX.11.031008