ANDREW ARMOUR andrew.armour@nottingham.ac.uk
Professor of Physics
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.
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
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 27, 2015 |
Publication Date | May 12, 2015 |
Deposit Date | Jul 12, 2016 |
Publicly Available Date | Jul 14, 2016 |
Journal | Physical Review B |
Print ISSN | 2469-9950 |
Electronic ISSN | 2469-9969 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 91 |
Issue | 184508 |
DOI | https://doi.org/10.1103/PhysRevB.91.184508 |
Public URL | https://nottingham-repository.worktribe.com/output/752127 |
Publisher URL | http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.184508 |
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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