Good news everyone! Our work Coherence of a hole-spin flopping-mode qubit in a circuit quantum electrodynamics environment just got published in Nature Physics!!

As you may remember from the preprint news, flopping-mode spin qubits are formed by delocalizing a spin across a double quantum dot, granting it a large electric dipole for strong coupling to microwave photons. The question was whether these qubits could also be operated coherently enough to be practical. In this work we demonstrate a hole flopping-mode qubit in a silicon nanowire with Rabi frequencies beyond 100 MHz, microsecond coherence times, and single-gate quality factors of 380. Even more interestingly, we find for the first time that coherence is limited by photonic effects rather than charge noise: radiative decay dominates relaxation and photon shot-noise induces dephasing. This means that with proper microwave engineering, flopping-mode qubits have plenty of room to shine as fast and coherent spin qubits strongly coupled to photons.