Quantum coherence and population transfer in a driven cascade three-level artificial atom
arXiv:1405.2383 · doi:10.1103/PhysRevA.89.053814
Abstract
We present an experimental investigation on the spectral characteristics of an artificial atom "transmon qubit" constituting a three-level cascade system (Ξ-system) in the presence of a pair of external driving fields. We observe two different types of Autler-Townes (AT) splitting: type I, where the phenomenon of two-photon resonance tends to diminish as the coupling field strength increases, and type II, where this phenomenon mostly stays constant. We find that the types are determined by the cooperative effect of the decay rates and the field strengths. Theoretically analyzing the density-matrix elements in the weak-field limit where the AT effect is suppressed, we single out events of pure two-photon coherence occurring owing to constructive quantum interference.
accepted for publication in PRA
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Cited by in corpus (5)
- Method for identifying electromagnetically induced transparency in a tunable circuit quantum electrodynamics system
- Electromagnetically induced transparency in circuit QED with nested polariton states
- Multi-photon dressing of an anharmonic superconducting many-level quantum circuit
- Mixing of coherent waves on a single three-level artificial atom
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