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Noise switching at a dynamical critical point in a cavity-conductor hybrid

Armour, Andrew D.; Kubala, Bjorn; Ankerhold, Joachim

Authors

Andrew D. Armour andrew.armour@nottingham.ac.uk

Bjorn Kubala

Joachim Ankerhold



Abstract

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.

Journal Article Type Article
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 96
Issue 21
APA6 Citation Armour, A. D., Kubala, B., & Ankerhold, J. (in press). Noise switching at a dynamical critical point in a cavity-conductor hybrid. Physical Review B, 96(21), doi:10.1103/PhysRevB.96.214509
DOI https://doi.org/10.1103/PhysRevB.96.214509
Publisher URL https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.214509
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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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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