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arXiv · 2507.22662

Nonclassical Photon-Assisted Transport in Superconducting Tunnel Junctions

Matthias Hübler·Juan Carlos Cuevas·Wolfgang Belzig
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Abstract

Advances in circuit quantum electrodynamics have enabled the generation of arbitrary nonclassical microwave states and paved the way for addressing novel physics questions. Here, we present a theoretical study of the electrical current in a Josephson tunnel junction interacting with a nonclassical electromagnetic environment. This allows us to generalize classical transport phenomena like photon-assisted tunneling and Shapiro steps to the quantum regime. We predict that the analysis of the supercurrent in such a setup enables the complete reconstruction of quantum states of the electromagnetic environment, something that is not possible with normal tunnel junctions.

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Matthias Hübler, Juan Carlos Cuevas, Wolfgang Belzig. 2025-07-30. Nonclassical Photon-Assisted Transport in Superconducting Tunnel Junctions. https://arxiv.org/abs/2507.22662

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