cQED has been underpinned by a very handy scheme for turning the description of an electric circuit into a quantum Hamiltonian 2, 3, 4, 5, 6 taking a lumped-element point of view, one identifies capacitors, inductors, and Josephson junctions, each of which contributes its own piece to this Hamiltonian.
This paradigm has now produced quantum-computing devices of unrivalled complexity (See ). Artificial atoms, and crafted light-matter couplings, have emulated and extended nature, using the new paradigm of circuit quantum electrodynamics (cQED) 1. Superconducting circuits have proved to be a successful design kit for the creation of new quantum systems, especially for quantum information processing.
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