Phys. Rev. Lett. 103, 193601 (2009) [4 pages]Autler-Townes Effect in a Superconducting Three-Level SystemReceived 16 April 2009; published 2 November 2009 When a three-level quantum system is irradiated by an intense coupling field resonant with one of the three possible transitions, the absorption peak of an additional probe field involving the remaining level is split. This process is known in quantum optics as the Autler-Townes effect. We observe these phenomena in a superconducting Josephson phase qubit, which can be considered an “artificial atom” with a multilevel quantum structure. The spectroscopy peaks can be explained reasonably well by a simple three-level Hamiltonian model. Simulation of a more complete model (including dissipation, higher levels, and cross coupling) provides excellent agreement with all of the experimental data. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.193601
DOI:
10.1103/PhysRevLett.103.193601
PACS:
42.50.Ct, 03.67.Lx, 74.50.+r, 73.23.−b
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