Mirror, mirror: Landau-Zener-Stuckelberg-Majorana interferometry of a superconducting qubit in front of a mirror

Abstract

We investigate the Landau-Zener-Stückelberg-Majorana interferometry of a superconducting qubit in a semi-infinite transmission line terminated by a mirror. The transmon-type qubit is at the node of the resonant electromagnetic (EM) field, "hiding" from the EM field. "Mirror, mirror" briefly describes this system, because the qubit acts as another mirror. We modulate the resonant frequency of the qubit by applying a sinusoidal flux pump. We probe the spectroscopy by measuring the reflection coefficient of a weak probe in the system. Remarkable interference patterns emerge in the spectrum, which can be interpreted as multi-photon resonances in the dressed qubit. Our calculations agree well with the experiments.

Deterministic loading and phase shaping of microwaves onto a single artificial atom

“…Strong interaction between a single artificial atom (a superconducting qubit) and propagating microwave photons has been achieved in a 1D open transmission line [5][6][7]. This has enabled many important quantum-optical experiments in 1D waveguide QED in superconducting circuits in the past decade [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Temporal dynamics has been studied for both a single artificial atom in such a system [20] and for a single real atom in free space [21][22][23].…”