Universal quantum fluctuations of a cavity mode driven by a Josephson junction.
We analyze the quantum dynamics of a superconducting cavity coupled to a voltage-biased Josephson junction. The cavity is strongly excited at resonances where the voltage energy lost by a Cooper pair traversing the circuit is a multiple of the cavity photon energy. We find that the resonances are accompanied by substantial squeezing of the quantum fluctuations of the cavity over a broad range of parameters and are able to identify regimes where the fluctuations in the system take on universal values.
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
A D
AD
Armour
Department of Physics and Astronomy, Dartmouth College, New Hampshire 03755, USA.
M P
MP
Blencowe
Department of Physics and Astronomy, Dartmouth College, New Hampshire 03755, USA.
E
E
Brahimi
Department of Physics and Astronomy, Dartmouth College, New Hampshire 03755, USA.
A J
AJ
Rimberg