Josephson photonics with a two-mode superconducting circuit

Armour, Andrew D., Kubala, B. and Ankerhold, J. (2015) Josephson photonics with a two-mode superconducting circuit. Physical Review B, 91 (184508). pp. 1-12. ISSN 2469-9969

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We analyze the quantum dynamics of two electromagnetic oscillators coupled in series to a voltage-biased Josephson junction. When the applied voltage leads to a Josephson frequency across the junction which matches the sum of the two mode frequencies, tunneling Cooper pairs excite photons in both modes simultaneously leading to far-from-equilibrium states. These states display highly nonclassical features including strong antibunching, violation of Cauchy-Schwartz inequalities, and number squeezing. We obtain approximate analytic results for both the regimes of low and high photon occupancies which are supported by a full numerical treatment. The impact of asymmetries between the two modes is explored, revealing a pronounced enhancement of number squeezing when the modes are damped at different rates.

Item Type: Article
Additional Information: Josephson photonics with a two-mode superconducting circuit A. D. Armour, B. Kubala, and J. Ankerhold Phys. Rev. B 91, 184508 – Published 12 May 2015
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
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Depositing User: Armour, Andrew
Date Deposited: 12 Jul 2016 08:36
Last Modified: 04 May 2020 17:08

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