Autler-Townes splitting in a three-dimensional transmon superconducting qubit
S. Novikov, J. E. Robinson, Z. K. Keane, B. Suri, F. C. Wellstood, B. S. Palmer
DOI 10.1103/PhysRevB.88.060503 · Physical Review B
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Abstract
We have observed the Autler-Townes doublet in a superconducting Al/AlOX/Al transmon qubit that acts as an artificial atom embedded in a three-dimensional Cu microwave cavity at a temperature of 22 mK. Using pulsed microwave spectroscopy, the three lowest transmon levels are isolated, eliminating unwanted effects of higher qubit modes and cavity modes. The long coherence time (∼40μs) of the transmon enables us to observe a clear Autler-Townes splitting at drive amplitudes much smaller than the transmon level anharmonicity (177 MHz). Three-level density matrix simulations with no free parameters provide excellent fits to the data. At maximum separation, the fidelity of a dark state achieved in this experiment is estimated to be 99.6%–99.9%.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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