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

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Published on: August 2, 2019

Stark effect and generalized Bloch-Siegert shift in a strongly driven two-level system.

Jani Tuorila¹, Matti Silveri, Mika Sillanpää

¹Department of Physics, University of Oulu, FI-90014, Finland.

Physical Review Letters

|January 15, 2011

Summary

This summary is machine-generated.

Superconducting qubits driven by strong microwave fields exhibit significant Stark shifts, requiring advanced calculations beyond standard models. This research validates the Floquet approach for understanding these complex quantum systems.

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Area of Science:

Quantum computing
Superconducting circuits
Quantum optics

Background:

Superconducting qubits are leading candidates for quantum computing.
Understanding qubit behavior under strong driving fields is crucial for device performance.
Nonlinear effects in qubit-microwave interactions can lead to complex phenomena.

Purpose of the Study:

To investigate the behavior of a superconducting qubit driven by an ultrastrong microwave field.
To analyze the pronounced Stark shifts observed in the qubit's energy levels.
To validate theoretical models, specifically the Floquet approach, for describing such systems.

Main Methods:

Driving a superconducting qubit with an oscillatory microwave field via nonlinear Josephson energy coupling.
Measuring Stark shifts of the qubit's atomic levels.
Probing quasienergies of the dressed two-level system using resonant cavity absorption.

Main Results:

Observed Stark shifts exceeding predictions from lowest-order Bloch-Siegert corrections.
Experimental results align with calculations based on the Floquet approach.
Demonstrated the necessity of higher-order corrections for accurate modeling.

Conclusions:

The Floquet approach accurately describes superconducting qubits under ultrastrong driving fields.
Advanced theoretical corrections are essential for understanding pronounced Stark shifts.
This work advances the control and understanding of superconducting quantum systems.