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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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Electrically protected resonant exchange qubits in triple quantum dots.

J M Taylor¹, V Srinivasa, J Medford

¹Joint Quantum Institute/National Institute of Standards and Technology, College Park, Maryland 20742, USA. jacob.taylor@nist.gov

Physical Review Letters

|August 20, 2013

Summary

We introduce a new quantum computing method using three spins in a triple quantum dot. This approach offers noise-protected gates and enhanced coupling for robust quantum computations.

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Area of Science:

Quantum Computing
Spintronics
Quantum Dots

Background:

Quantum computing harnesses quantum-mechanical phenomena to perform computations.
Spin qubits in quantum dots are a promising platform for scalable quantum computing.
Low-frequency electrical noise poses a significant challenge to qubit coherence and gate fidelity.

Purpose of the Study:

To present a novel modulated microwave approach for quantum computing using three-spin qubits in a triple quantum dot.
To demonstrate single- and two-qubit gates protected against low-frequency electrical noise.
To leverage existing double quantum dot advancements for enhanced qubit performance.

Main Methods:

Utilizing a modulated microwave technique for qubit control.
Operating at a point with narrowband response to high-frequency electric fields for noise protection.
Employing spin-to-charge conversion for robust qubit preparation and measurement.
Leveraging electric dipole terms for strong coupling with superconducting microwave resonators.

Main Results:

Development of single- and two-qubit gates resilient to low-frequency electrical noise.
Successful application of established double quantum dot techniques (spin-to-charge conversion) to the new qubit architecture.
Achieved strong coupling between qubits and superconducting microwave resonators via high-frequency electric field interactions.
Demonstrated potential for more robust two-qubit gates.

Conclusions:

The modulated microwave approach offers a viable pathway for noise-protected quantum computation with three-spin qubits.
The integration with existing double quantum dot technologies simplifies implementation and enhances qubit robustness.
Strong coupling to microwave resonators paves the way for improved two-qubit gate fidelity and scalability.