A superconducting qubit (cross) coupled to its readout resonator (top) through a Josephson junction (red) and capacitor (blue). (IMAGE)

Ecole Polytechnique Fédérale de Lausanne

A superconducting qubit (cross) coupled to its readout resonator (top) through a Josephson junction (red) and capacitor (blue).

Caption

The large cross-shaped structure represents the qubit, while the waveguide at the top is the readout resonator. The new connection between the two is highlighted by the Josephson junction glowing in red and the capacitor glowing in blue.

Credit

Guillaume Beaulieu ©2026 EPFL

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