3 published posts.
A caesium atom comes with its frequency fixed by nature. A transmon's frequency is whatever the cleanroom produced, and it drifts. Four experiments, invented for atoms and nuclei long before anyone built an artificial atom, turn a patch of aluminium into something you can program: Rabi, T1, Ramsey and echo. What each one measures, what the fits mean, and why the job is never finished.
Most pictures of a qubit show a glowing particle. The qubits inside Google's and IBM's machines are circuits you can see under an ordinary microscope. How a capacitor and one strange junction make an artificial atom, why it has to be big and boring, and why it needs a fridge colder than space.
Two months into a PhD on superconducting qubits, I watched the 2025 Nobel Prize in Physics go to the experiment my whole field stands on. What Clarke, Devoret and Martinis showed in 1985, the equations behind it, and how it leads to the qubits my group works on.
