The interplay of the tunneling transfer of charges and the emission and absorption of light can be investigated in a set-up, where a voltage-biased Josephson junction is placed in series to a microwave cavity. Here, we concentrate on the emission process and show that due to the inherent nonlinearity of the Josephson junction tunneling Cooper-pairs can create a variety of non-classical states of light. Depending on experimental parameters and tuning the device can be described by effective Hamiltonians, indicating specific photon creation mechanisms which lead to strongly bunched or anti-bunched light emission. We derive explicit analytical expressions for the photon correlation function g(2)(τ=0) for these different processes and investigate their full crossover numerically. Photon distribution functions show squeezing and other interesting non-Poissonian behavior.
@article{arxiv.1404.6259,
title = {Non-classical light from superconducting resonators coupled to voltage-biased Josephson junctions},
author = {Björn Kubala and Vera Gramich and Joachim Ankerhold},
journal= {arXiv preprint arXiv:1404.6259},
year = {2015}
}
Comments
10 pages, 4 figures; proceedings of the FQMT13 conference, submitted to Physica Scripta