Black-box superconducting circuit quantization

Abstract

We present a semi-classical method for determining the effective low-energy quantum Hamiltonian of weakly anharmonic superconducting circuits containing mesoscopic Josephson junctions coupled to electromagnetic environments made of an arbitrary combination of distributed and lumped elements. A convenient basis, capturing the multi-mode physics, is given by the quantized eigenmodes of the linearized circuit and is fully determined by a classical linear response function. The method is used to calculate numerically the low-energy spectrum of a 3D-transmon system, and quantitative agreement with measurements is found.

10 pages, 6 figures, includes supplementary material

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• Deterministic protocol for mapping a qubit to coherent state superpositions in a cavity
• Quantum dynamics of an electromagnetic mode that cannot contain N photons
• Violating Bell's inequality with an artificial atom and a cat state in a cavity