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

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High-Fidelity Controlled-Z Gate with Maximal Intermediate Leakage Operating at the Speed Limit in a Superconducting

V Negîrneac^1,2, H Ali^1,3, N Muthusubramanian^1,3

¹QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.

Physical Review Letters

|June 21, 2021

Summary

We developed a simple tuneup method for fast two-qubit gates, crucial for scaling quantum processors. This new scheme enables rapid, easily tunable controlled-Z gates, advancing quantum computing development.

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Area of Science:

Quantum Computing
Quantum Information Science
Solid-State Physics

Background:

Scaling quantum processors requires efficient and simple tuneup methods for two-qubit gates.
Controlled-Z (CZ) gates are fundamental building blocks in quantum algorithms.

Purpose of the Study:

Introduce a novel, simplified method for realizing fast two-qubit controlled-Z gates.
Demonstrate the speed and tuneup simplicity of the proposed gate scheme.

Main Methods:

Implemented the sudden variant (SNZ) of the net zero scheme for CZ gate realization.
Utilized flux control of transmon frequency in a multitransmon processor.
Maximized intermediate leakage to achieve gates at the speed limit of transverse coupling.

Main Results:

Achieved fast CZ gates operating at the speed limit.
Demonstrated tuneup simplicity due to the regular structure of conditional phase and leakage.
Verified compatibility with quantum error correction schemes.

Conclusions:

The SNZ scheme offers a significant advancement in fast and simple tuneup of CZ gates.
This method is adaptable for generalized conditional-phase gates in intermediate-scale quantum applications.
SNZ is a promising technique for the scalable development of quantum processors.