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Josephson photonics with a two-mode superconducting circuit

Armour, Andrew D.; Kubala, B.; Ankerhold, J.

Authors

B. Kubala

J. Ankerhold



Abstract

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.

Journal Article Type Article
Publication Date May 12, 2015
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 91
Issue 184508
APA6 Citation Armour, A. D., Kubala, B., & Ankerhold, J. (2015). Josephson photonics with a two-mode superconducting circuit. Physical Review B, 91(184508), https://doi.org/10.1103/PhysRevB.91.184508
DOI https://doi.org/10.1103/PhysRevB.91.184508
Publisher URL http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.184508
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
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

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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