Observation of quantum many-body effects due to zero point fluctuations in superconducting circuits.

ABSTRACT: Electromagnetic fields possess zero point fluctuations which lead to observable effects such as the Lamb shift and the Casimir effect. In the traditional quantum optics domain, these corrections remain perturbative due to the smallness of the fine structure constant. To provide a direct observation of non-perturbative effects driven by zero point fluctuations in an open quantum system we wire a highly non-linear Josephson junction to a high impedance transmission line, allowing large phase fluctuations across the junction. Consequently, the resonance of the former acquires a relative frequency shift that is orders of magnitude larger than for natural atoms. Detailed modeling confirms that this renormalization is non-linear and quantum. Remarkably, the junction transfers its non-linearity t

SUBMITTER: Leger S 

PROVIDER: S-EPMC6868017 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature