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Waveguide Bandgap Engineering with an Array of Superconducting Qubits by Brehm, Jan David (author);Poddubny, Alexander N. (author);Stehli, Alexander (author);Wolz, Tim (author);Rotzinger, Hannes (author);Ustinov, Alexey V. (author) is a Physics and Astronomy article available to read on EtoBox.

What is Waveguide Bandgap Engineering with an Array of Superconducting Qubits about?

## Abstract Waveguide quantum electrodynamics offers a wide range of possibilities to effectively engineer interactions between artificial atoms via a one-dimensional open waveguide. While these interactions have been experimentally studied in the few qubit limit, the collective properties of such systems for larger arrays of qubits in a metamaterial configuration has so far not been addressed. Here, we experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control coupled to the mode continuum of a waveguide. By consecutively tuning the qubits to a common resonance frequency we observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. Making use of the qubits quantum nonlinearity, we demonstrate control over the latter by inducing a transparency window in the bandgap region of the ensemble. The circuit of this work extends experiments with one and two qubits toward a full-blown quantum metamaterial, thus paving the way for large-scale applications in superconducting waveguide quantum electrodynamics.

Who reads Waveguide Bandgap Engineering with an Array of Superconducting Qubits?

Author

Brehm, Jan David (author);Poddubny, Alexander N. (author);Stehli, Alexander (author);Wolz, Tim (author);Rotzinger, Hannes (author);Ustinov, Alexey V. (author)

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Physics and Astronomy (Physical Sciences)