Probing the Jaynes-Cummings Ladder with Spin Circuit Quantum Electrodynamics

Tobias Bonsen, Patrick Harvey-Collard, Maximilian Russ, Jurgen Dijkema, Amir Sammak, Giordano Scappucci, Lieven M.K. Vandersypen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
42 Downloads (Pure)


We report observations of transitions between excited states in the Jaynes-Cummings ladder of circuit quantum electrodynamics with electron spins (spin circuit QED). We show that unexplained features in recent experimental work correspond to such transitions and present an input-output framework that includes these effects. In new experiments, we first reproduce previous observations and then reveal both excited-state transitions and multiphoton transitions by increasing the probe power and using two-tone spectroscopy. This ability to probe the Jaynes-Cummings ladder is enabled by improvements in the coupling-to-decoherence ratio, and shows an increase in the maturity of spin circuit QED as an interesting platform for studying quantum phenomena.

Original languageEnglish
Article number137001
JournalPhysical review letters
Issue number13
Publication statusPublished - 2023


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