Noise switching at a dynamical critical point in a cavity-conductor hybrid
Coupling a mesoscopic conductor to a microwave cavity can lead to fascinating feedback effects which generate strong correlations between the dynamics of photons and charges. We explore the connection between cavity dynamics and charge transport in a model system consisting of a voltage-biased Jose...
| Main Authors: | , , |
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| Format: | Article |
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American Physical Society
2017
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| Online Access: | https://eprints.nottingham.ac.uk/48848/ |
| _version_ | 1848797862568132608 |
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| author | Armour, Andrew D. Kubala, Bjorn Ankerhold, Joachim |
| author_facet | Armour, Andrew D. Kubala, Bjorn Ankerhold, Joachim |
| author_sort | Armour, Andrew D. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Coupling a mesoscopic conductor to a microwave cavity can lead to fascinating feedback effects which generate strong correlations between the dynamics of photons and charges. We explore the connection between cavity dynamics and charge transport in a model system consisting of a voltage-biased Josephson junction embedded in a high-Q cavity, focussing on the behavior as the system is tuned through a dynamical critical point. On one side of the critical point the noise is strongly suppressed, signalling the existence of a novel regime of highly coherent transport, but on the other side it switches abruptly to a much larger value. Using a semiclassical approach we show that this behavior arises because of the strongly nonlinear cavity drive generated by the Cooper pairs. We also uncover an equivalence between charge and photonic current noise in the system which opens up a route to detecting the critical behavior through straightforward microwave measurements. |
| first_indexed | 2025-11-14T20:10:37Z |
| format | Article |
| id | nottingham-48848 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:10:37Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-488482020-05-04T19:23:45Z https://eprints.nottingham.ac.uk/48848/ Noise switching at a dynamical critical point in a cavity-conductor hybrid Armour, Andrew D. Kubala, Bjorn Ankerhold, Joachim Coupling a mesoscopic conductor to a microwave cavity can lead to fascinating feedback effects which generate strong correlations between the dynamics of photons and charges. We explore the connection between cavity dynamics and charge transport in a model system consisting of a voltage-biased Josephson junction embedded in a high-Q cavity, focussing on the behavior as the system is tuned through a dynamical critical point. On one side of the critical point the noise is strongly suppressed, signalling the existence of a novel regime of highly coherent transport, but on the other side it switches abruptly to a much larger value. Using a semiclassical approach we show that this behavior arises because of the strongly nonlinear cavity drive generated by the Cooper pairs. We also uncover an equivalence between charge and photonic current noise in the system which opens up a route to detecting the critical behavior through straightforward microwave measurements. American Physical Society 2017-12-21 Article PeerReviewed Armour, Andrew D., Kubala, Bjorn and Ankerhold, Joachim (2017) Noise switching at a dynamical critical point in a cavity-conductor hybrid. Physical Review B, 96 (21). p. 214509. ISSN 2469-9969 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.214509 doi:10.1103/PhysRevB.96.214509 doi:10.1103/PhysRevB.96.214509 |
| spellingShingle | Armour, Andrew D. Kubala, Bjorn Ankerhold, Joachim Noise switching at a dynamical critical point in a cavity-conductor hybrid |
| title | Noise switching at a dynamical critical point in a cavity-conductor hybrid |
| title_full | Noise switching at a dynamical critical point in a cavity-conductor hybrid |
| title_fullStr | Noise switching at a dynamical critical point in a cavity-conductor hybrid |
| title_full_unstemmed | Noise switching at a dynamical critical point in a cavity-conductor hybrid |
| title_short | Noise switching at a dynamical critical point in a cavity-conductor hybrid |
| title_sort | noise switching at a dynamical critical point in a cavity-conductor hybrid |
| url | https://eprints.nottingham.ac.uk/48848/ https://eprints.nottingham.ac.uk/48848/ https://eprints.nottingham.ac.uk/48848/ |