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Physical review. B./Physical review. B

Publisher's Note: Approaching ultrastrong coupling in transmon circuit QED using a high-impedance resonator [Phys. Rev. B 95 , 224515 (2017)]

Sal J. Bosman, Mario F. Gely, Vibhor Singh, Daniel Bothner, Andrés Castellanos-Gómez, Gary Alexander Steele

Published Jan 4, 2019• 0 citations
Publisher

Abstract

Received 19 December 2018DOI:https://doi.org/10.1103/PhysRevB.99.019901©2019 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasJosephson effectMesoscopicsSuperconductivityPhysical SystemsSuperconductorsTunnel junctionsTechniquesHomodyne & heterodyne detectionJosephson junctionsMicrowave techniquesSQUIDSecond quantizationSuperconducting devicesSuperconducting qubitsCondensed Matter, Materials & Applied Physics

DOI
10.1103/physrevb.99.019901

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In this experiment, we couple a superconducting transmon qubit to a high-impedance $645\phantom{\rule{0.28em}{0ex}}\mathrm{\ensuremath{\Omega}}$ microwave resonator. Doing so leads to a large qubit-resonator coupling rate $g$, measured through a large vacuum Rabi splitting of $2g\ensuremath{\simeq}910$ MHz. The coupling is a significant fraction of the qubit and resonator oscillation frequencies $\ensuremath{\omega}$, placing our system close to the ultrastrong coupling regime ($\overline{g}=g/\ensuremath{\omega}=0.071$ on resonance). Combining this setup with a vacuum-gap transmon architecture shows the potential of reaching deep into the ultrastrong coupling $\overline{g}\ensuremath{\sim}0.45$ with transmon qubits.

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Received 19 December 2018DOI:https://doi.org/10.1103/PhysRevB.99.019901©2019 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasJosephson effectMesoscopicsSuperconductivityPhysical SystemsSuperconductorsTunnel junctionsTechniquesHomodyne & heterodyne detectionJosephson junctionsMicrowave techniquesSQUIDSecond quantizationSuperconducting devicesSuperconducting qubitsCondensed Matter, Materials & Applied Physics
In this experiment, we couple a superconducting transmon qubit to a high-impedance $645\phantom{\rule{0.28em}{0ex}}\mathrm{\ensuremath{\Omega}}$ microwave resonator. Doing so leads to a large qubit-resonator coupling rate ggg, measured through a large vacuum Rabi splitting of $2g\ensuremath{\simeq}910$ MHz. The coupling is a significant fraction of the qubit and resonator oscillation frequencies $\ensuremath{\omega}$, placing our system close to the ultrastrong coupling regime ($\overline{g}=g/\ensuremath{\omega}=0.071$ on resonance). Combining this setup with a vacuum-gap transmon architecture shows the potential of reaching deep into the ultrastrong coupling $\overline{g}\ensuremath{\sim}0.45$ with transmon qubits.