Decoherence in a crystal-phase defined double quantum dot charge qubit strongly coupled to a high-impedance resonator

Studies decoherence of an InAs crystal-phase-defined DQD charge qubit strongly coupled to a high-impedance microwave resonator.

Key Results

Extracted $g /2 π = 320 MHz$ and total decoherence $Γ/2 π = 260 MHz$ at the sweet spot.
Found only a 10% change in decoherence despite a fivefold reduction in detuning-noise sensitivity.
Identified electron-phonon relaxation and circuit loss as more plausible limits than detuning noise for this device.