Quantum squeezing by a parametric resonance in a SQUID

Details Quantum squeezing by a parametric resonance in a SQUID Quantum squeezing by a parametric resonance in a SQUID

2006-03-27

arxiv.org/abs/cond-mat/0603709v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 11 Figs

Scientific paper

We study rotating squeezed quantum states created by a parametric resonance in an open harmonic system. As a specific realization of the phenomenon we study a mesoscopic SQUID loop where the state preparation procedure is simple in principle and feasible with currently available experimental methods. By solving dynamics and calculating spectral properties we show that quantum fluctuations of SQUID observables can be reduced below their groundstate value. The measurement is introduced by coupling the SQUID to a transmission line carrying the radiation to a secondary measurement device. Besides the theoretical interest, our studies are motivated by an opportunity for a practical quantum noise engineering.

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