Transformed Dissipation in Superconducting Quantum Circuits

Details Transformed Dissipation in Superconducting Quantum Circuits Transformed Dissipation in Superconducting Quantum Circuits

2008-01-19

arxiv.org/abs/0801.2994v2

Phys. Rev. B 77, 180508(R) (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.180508

Superconducting quantum circuits must be designed carefully to avoid dissipation from coupling to external control circuitry. Here we introduce the concept of current transformation to quantify coupling to the environment. We test this theory with an experimentally-determined impedance transformation of $\sim 10^5$ and find quantitative agreement better than a factor of 2 between this transformation and the reduced lifetime of a phase qubit coupled to a tunable transformer. Higher-order corrections from quantum fluctuations are also calculated with this theory, but found not to limit the qubit lifetime. We also illustrate how this simple connection between current and impedance transformation can be used to rule out dissipation sources in experimental qubit systems.

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