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
DOI 10.1103/PhysRevB.95.224515 · Physical Review B
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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.
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