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Comptes Rendus Physique
Volume 17, n° 7
pages 740-755 (août 2016)
Doi : 10.1016/j.crhy.2016.07.012
Introduction to parametric amplification of quantum signals with Josephson circuits
Introduction à l'amplification paramétrique de signaux quantiques par les circuits Josephson

Ananda Roy , Michel Devoret
 Department of Applied Physics, Yale University, PO BOX 208284, 06511 New Haven, CT, USA 


This short and opinionated review starts with the concept of quantum signals at microwave frequencies and focuses on the principle of linear parametric amplification. This process emerges from the dispersive nonlinearity of Josephson junctions driven with appropriate tones. We discuss two defining characteristics of the corresponding amplifying devices: i) the number of modes excited by the signal, idler and pump waves and ii) the number of independent ports through which these waves enter into the circuit.

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Cette courte revue partisane débute par l'exposition de la notion de signal quantique dans le domaine micro-ondes et se concentre ensuite sur le principe de l'amplification paramétrique en régime linéaire. Ce mécanisme émerge de la non-linearité dispersive de jonctions Josephson pompées à des fréquences appropriées. Nous discutons deux caractéristiques fondamentales des dispositifs amplificateurs : i) le nombre de modes excités par les ondes du signal, de l'image et de la pompe et ii) le nombre de ports indépendants à travers lesquels ces ondes entrent dans le circuit.

The full text of this article is available in PDF format.

Keywords : Quantum electrodynamics, Parametric amplification, Josephson circuits

Mots-clés : Electrodynamique quantique, Amplification paramétrique, Amplificateurs, Circuits Josephson

1  The index value   corresponds to special wavelets that have to be treated separately.

© 2016  Published by Elsevier Masson SAS de la part de Académie des sciences.
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