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Probing the Jaynes-Cummings Ladder with Spin Circuit Quantum Electrodynamics.
Tobias Bonsen1, Patrick Harvey-Collard1, Maximilian Russ1
1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands.
Physical Review Letters
|April 17, 2023
Summary
Researchers observed transitions between excited states in spin circuit quantum electrodynamics (spin circuit QED). This finding explains previous experimental anomalies and advances the platform for quantum studies.
Area of Science:
- Quantum Physics
- Quantum Electrodynamics
- Condensed Matter Physics
Background:
- Circuit quantum electrodynamics (circuit QED) is a rapidly developing field.
- Electron spins offer a promising avenue for quantum information processing within circuit QED architectures.
- Previous experimental results in spin circuit QED showed unexplained features.
Purpose of the Study:
- To investigate and explain unexplained features in recent spin circuit QED experiments.
- To observe and characterize transitions between excited states in the Jaynes-Cummings ladder of spin circuit QED.
- To develop a theoretical framework for understanding these excited-state transitions.
Main Methods:
- Reproducing previous experimental observations.
- Conducting new experiments with increased probe power.
- Utilizing two-tone spectroscopy to probe the system.
- Developing an input-output theoretical framework.
Main Results:
- Unexplained experimental features were identified as transitions between excited states.
- Both excited-state and multiphoton transitions were experimentally observed.
- The input-output framework successfully incorporated these transitions.
- Improvements in the coupling-to-decoherence ratio enabled detailed probing.
Conclusions:
- The observed transitions clarify previous experimental anomalies in spin circuit QED.
- Spin circuit QED is maturing as a platform for exploring quantum phenomena.
- The ability to probe the Jaynes-Cummings ladder has been significantly enhanced.
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