Comptes Rendus
no. 7
Non-classical radiation emission by a coherent conductor
[Rayonnement non classique émis par un conducteur cohérent]
Jean-Charles Forgues1  ; Gabriel Gasse1  ; Christian Lupien1  ; Bertrand Reulet1
1 Département de physique, Université de Sherbrooke, 2500, bd de l'Université, Sherbrooke, Québec, Canada, J1K 2R1
Comptes Rendus. Physique, Volume 17 (2016) no. 7, pp. 718-728.

Nous rapportons des preuves expérimentales de ce que le champ électromagnétique micro-ondes généré par un conducteur normal, une jonction tunnel placée à ultra-basse température, peut avoir un comportement non classique. Nous démontrons l'existence de compression d'état ainsi que d'enchevêtrement dans cette radiation en mesurant les quadratures du champ électromagnétique à une ou deux fréquences de l'ordre du GHz. Dans une expérience, nous observons que la variance d'une quadrature du bruit photo-assisté généré par la jonction descend sous son niveau de vide. Dans une deuxième expérience, nous démontrons l'existence de corrélations entre les quadratures observées à deux fréquences, corrélations qui peuvent être supérieures à ce qui est permis par la mécanique classique, prouvant que la radiation à ces deux fréquences est enchevêtrée.1

We report experimental evidence that the microwave electromagnetic field generated by a normal conductor, here a tunnel junction placed at ultra-low temperature, can be non-classical. By measuring the quadratures of the electromagnetic field at one or two frequencies in the GHz range, we demonstrate the existence of squeezing as well as entanglement in such radiation. In one experiment, we observe that the variance of one quadrature of the photo-assisted noise generated by the junction goes below its vacuum level. In the second experiment, we demonstrate the existence of correlations between the quadratures taken at two frequencies, which can be stronger than allowed by classical mechanics, proving that the radiation at those two frequencies are entangled.1

Publié le :
DOI : 10.1016/j.crhy.2016.07.004
Keywords: Quantum microwaves, Entanglement, Squeezing, Quantum noise, Shot noise, Tunnel junction
Mot clés : Micro-ondes quantiques, Enchevêtrement, Compression d'état, Bruit Quantique, Bruit de grenaille, Jonction tunnel
Jean-Charles Forgues 1 ; Gabriel Gasse 1 ; Christian Lupien 1 ; Bertrand Reulet 1

1 Département de physique, Université de Sherbrooke, 2500, bd de l'Université, Sherbrooke, Québec, Canada, J1K 2R1 
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Jean-Charles Forgues; Gabriel Gasse; Christian Lupien; Bertrand Reulet. Non-classical radiation emission by a coherent conductor. Comptes Rendus. Physique, Volume 17 (2016) no. 7, pp. 718-728. doi : 10.1016/j.crhy.2016.07.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.07.004/

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