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This research demonstrates that Josephson junctions can be excited via electromagnetic field gradients even at points of zero field intensity, challenging conventional circuit models that overlook spatial correlations. By shifting focus from temporal characteristics to the vectorial profile of applied fields, this framework enables precise control over artificial atoms using structured light, which could significantly enhance energy efficiency and precision in quantum optics and computation. The ability to manipulate these nanoscale systems through quadrupole transitions represents a critical boundary crossing for advancing complex quantum structures beyond traditional manipulation methods.

Surse care acoperăQuantum Zeitgeist, Latent Space, arXiv

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Artificial Atoms Reveal Hidden Effects of Light’s Spatial Patterns

Quantum Zeitgeist9 iunie 20266 min de cititArticolul și perspectiva sunt în engleză.

Forbidden transitions in superconducting artificial atoms A Josephson junction can now be stimulated even where the electric field is zero, defying conventional expectations of electromagnetic excitation. This is achieved by systematically accounting for the spatial profile of applied fields, a factor previously overlooked in standard circuit and black-box models. The resulting theory offers a first step towards controlling these junctions with structured light and building more complex quantum structures.

Researchers at Chalmers University of Technology, led by Alberto Del Ángel Medina, have developed a novel theoretical framework that shifts the focus from the temporal characteristics to the spatial correlations of electromagnetic fields impacting Josephson junction artificial atoms. Their microscopic model systematically accounts for the vectorial profile of electromagnetic fields, revealing the possibility of exciting junctions via quadrupole transitions dependent on electric field gradients, even where the field intensity is zero. This research sharply expands understanding of interactions within artificial atoms and could unlock new avenues for utilising their sensitivity in quantum optics, metrology, and computation. With a characteristic oxide layer length of approximately 1nm, a shift in achievable excitation thresholds for Josephson…

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