Tunneling Spectroscopy in Superconducting Circuit Lattices

• URL: http://arxiv.org/abs/2411.07997v1
• Date: Tue, 12 Nov 2024 18:22:04 GMT
• Title: Tunneling Spectroscopy in Superconducting Circuit Lattices
• Authors: Botao Du, Qihao Guo, Santiago López, Ruichao Ma,
• Abstract summary: tunneling spectroscopy of synthetic quantum matter in superconducting circuit lattices. We measure site-resolved excitation spectra by coupling the lattice to engineered driven-dissipative particle baths. We extract quasi-particle and quasi-hole spectra and reconstruct the spatial structure of collective excitations.
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• Abstract: We demonstrate tunneling spectroscopy of synthetic quantum matter in superconducting circuit lattices. We measure site-resolved excitation spectra by coupling the lattice to engineered driven-dissipative particle baths that serve as local tunneling probes. Using incoherent particle source and drain, we independently extract quasi-particle and quasi-hole spectra and reconstruct the spatial structure of collective excitations. We perform spectroscopy of a strongly interacting Bose-Hubbard lattice at different densities, observing changes in energy gaps across the superfluid to Mott-insulator transition and the effects of three-body interactions. Our results provide a new toolset for characterizing many-body states in analog quantum simulators.

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