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Gapped Flat Band Lattice Interacting with Qubits

November 1, 2023
Image of a lattice device and data showing a qubit interacting with lattice modes

Image of the quasi 1-D lattice device coupled to transmon qubits is shown on the left. The image on the right shows data from the lattice interacting with a transmon qubit as its frequency is flux-tuned.

Lattices of coplanar waveguide resonators are a promising platform for studying exotic light-matter interactions. This device, the first ever of its kind, is now operational, featuring flux tunable transmon qubits coupled to a quasi-1D lattice has an interesting band structure, and includes a gapped flat-band. The transmon-lattice coupling shines light on the photonic band structure and produces new forms of photon-mediated qubit-qubit interaction.