Approaching ultrastrong coupling in transmon circuit QED using a high-impedance resonator

Sal J. Bosman, Mario F. Gely, Vibhor Singh, Daniel Bothner, Andres Castellanos-Gomez, Gary A. Steele

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)
38 Downloads (Pure)

Abstract

In this experiment, we couple a superconducting transmon qubit to a high-impedance 645Ω microwave resonator. Doing so leads to a large qubit-resonator coupling rate g, measured through a large vacuum Rabi splitting of 2g≃910 MHz. The coupling is a significant fraction of the qubit and resonator oscillation frequencies ω, placing our system close to the ultrastrong coupling regime (g=g/ω=0.071 on resonance). Combining this setup with a vacuum-gap transmon architecture shows the potential of reaching deep into the ultrastrong coupling g∼0.45 with transmon qubits.

Original languageEnglish
Article number224515
Number of pages5
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume95
Issue number22
DOIs
Publication statusPublished - 29 Jun 2017

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