Josephson photonics with a two-mode superconducting circuit
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 mo...
| Main Authors: | , , |
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| Format: | Article |
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American Physical Society
2015
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| Online Access: | https://eprints.nottingham.ac.uk/34807/ |
| _version_ | 1848794940107128832 |
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| author | Armour, Andrew D. Kubala, B. Ankerhold, J. |
| author_facet | Armour, Andrew D. Kubala, B. Ankerhold, J. |
| author_sort | Armour, Andrew D. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:24:10Z |
| format | Article |
| id | nottingham-34807 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:24:10Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-348072020-05-04T17:08:35Z https://eprints.nottingham.ac.uk/34807/ Josephson photonics with a two-mode superconducting circuit Armour, Andrew D. Kubala, B. Ankerhold, J. 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. American Physical Society 2015-05-12 Article PeerReviewed 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 http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.184508 doi:10.1103/PhysRevB.91.184508 doi:10.1103/PhysRevB.91.184508 |
| spellingShingle | Armour, Andrew D. Kubala, B. Ankerhold, J. Josephson photonics with a two-mode superconducting circuit |
| title | Josephson photonics with a two-mode superconducting circuit |
| title_full | Josephson photonics with a two-mode superconducting circuit |
| title_fullStr | Josephson photonics with a two-mode superconducting circuit |
| title_full_unstemmed | Josephson photonics with a two-mode superconducting circuit |
| title_short | Josephson photonics with a two-mode superconducting circuit |
| title_sort | josephson photonics with a two-mode superconducting circuit |
| url | https://eprints.nottingham.ac.uk/34807/ https://eprints.nottingham.ac.uk/34807/ https://eprints.nottingham.ac.uk/34807/ |