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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Autler-Townes effect in a superconducting three-level system.

Mika A Sillanpää¹, Jian Li, Katarina Cicak

¹Helsinki University of Technology, Low Temperature Laboratory, Puumiehenkuja 2B, Espoo, FIN-02015 HUT Finland. Mika.Sillanpaa@iki.fi

Physical Review Letters

|April 7, 2010

Summary

The Autler-Townes effect, a splitting of quantum absorption peaks, was observed in a superconducting Josephson phase qubit. This artificial atom demonstrated multilevel quantum phenomena consistent with theoretical models.

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Area of Science:

Quantum Optics
Superconducting Circuits
Artificial Atoms

Background:

The Autler-Townes effect describes the splitting of an absorption peak in a three-level quantum system driven by a strong resonant field.
Superconducting circuits, like Josephson phase qubits, serve as controllable artificial atoms with engineered quantum structures.

Purpose of the Study:

To experimentally observe and characterize the Autler-Townes effect in a superconducting Josephson phase qubit.
To validate theoretical models describing multilevel quantum phenomena in artificial atoms.

Main Methods:

Irradiating a three-level superconducting Josephson phase qubit with an intense coupling field.
Probing the qubit with an additional field to observe changes in absorption spectroscopy.
Comparing experimental results with predictions from simple and comprehensive theoretical models.

Main Results:

Observed splitting of the probe field absorption peak, characteristic of the Autler-Townes effect.
Spectroscopy peaks were reasonably explained by a basic three-level Hamiltonian.
A more complete model, including dissipation and higher energy levels, showed excellent agreement with all experimental data.

Conclusions:

Superconducting Josephson phase qubits exhibit quantum optical phenomena like the Autler-Townes effect.
Theoretical models, especially comprehensive ones, accurately describe the observed multilevel quantum behavior in artificial atoms.