Probing the Jaynes-Cummings Ladder with Spin Circuit Quantum Electrodynamics
T.R. Bonsen (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - BUS/Quantum Delft)
P. Harvey-Collard (Kavli institute of nanoscience Delft, TU Delft - QCD/Vandersypen Lab, TU Delft - QuTech Advanced Research Centre)
M. Rimbach-Russ (TU Delft - QCD/Vandersypen Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Jurgen Dijkema (TU Delft - QCD/Vandersypen Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Amir Sammak (TU Delft - QuTech Advanced Research Centre, TU Delft - BUS/TNO STAFF)
Giordano Scappucci (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab)
L.M.K. Vandersypen (Kavli institute of nanoscience Delft, TU Delft - QN/Vandersypen Lab, TU Delft - QuTech Advanced Research Centre)
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Abstract
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.