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Article Dans Une Revue Phys.Rev.B Année : 2024

Microwave spectroscopy of Schmid transition

Résumé

Schmid transition was introduced first as a superconductor-insulator transition in the zero-frequency response of a shunted Josephson junction in equilibrium at zero temperature. As it is typical for a quantum impurity problem, at finite frequencies the transition is broadened to a crossover. Modern attempts to find Schmid transition rely on finite-frequency measurements of a quantum circuit. We predict the frequency dependence of the admittance and reflection phase shift for a high-impedance transmission line terminated by a Josephson junction for a wide variety of devices, from a charge qubit to a transmon. Our results identify the circuit parameters allowing for the universal scaling of the responses with frequency, thus helping to identify the Schmid transition from the finite-frequency measurements.

Dates et versions

hal-04211201 , version 1 (19-09-2023)

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Manuel Houzet, Tsuyoshi Yamamoto, Leonid I Glazman. Microwave spectroscopy of Schmid transition. Phys.Rev.B, 2024, 109 (15), pp.155431. ⟨10.1103/PhysRevB.109.155431⟩. ⟨hal-04211201⟩
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