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Journal Articles npj Quantum Information Year : 2021

Energy-participation quantization of Josephson circuits

Abstract

Abstract Superconducting microwave circuits incorporating nonlinear devices, such as Josephson junctions, are a leading platform for emerging quantum technologies. Increasing circuit complexity further requires efficient methods for the calculation and optimization of the spectrum, nonlinear interactions, and dissipation in multi-mode distributed quantum circuits. Here we present a method based on the energy-participation ratio (EPR) of a dissipative or nonlinear element in an electromagnetic mode. The EPR, a number between zero and one, quantifies how much of the mode energy is stored in each element. The EPRs obey universal constraints and are calculated from one electromagnetic-eigenmode simulation. They lead directly to the system quantum Hamiltonian and dissipative parameters. The method provides an intuitive and simple-to-use tool to quantize multi-junction circuits. We experimentally tested this method on a variety of Josephson circuits and demonstrated agreement within several percents for nonlinear couplings and modal Hamiltonian parameters, spanning five orders of magnitude in energy, across a dozen samples.

Dates and versions

hal-03467417 , version 1 (06-12-2021)

Identifiers

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Zlatko Minev, Zaki Leghtas, Shantanu Mundhada, Lysander Christakis, Ioan Pop, et al.. Energy-participation quantization of Josephson circuits. npj Quantum Information, 2021, 7 (1), ⟨10.1038/s41534-021-00461-8⟩. ⟨hal-03467417⟩
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