Variational quantum compiling for three-qubit gates design in quantum dots

TL;DR

This paper presents a variational quantum compiling approach to design high-fidelity three-qubit gates, like Toffoli and Fredkin, in quantum dots, enhancing robustness against noise for scalable quantum computing.

Contribution

It introduces a novel variational compiling method using a time-independent Hamiltonian for efficient three-qubit gate design in quantum dots.

Findings

High-fidelity three-qubit gates achieved

Robustness against charge and nuclear spin noise demonstrated

Applicable to various physical quantum systems

Abstract

Semiconductor quantum dots offer a promising platform for controlling spin qubits and realizing quantum logic gates, essential for scalable quantum computing. In this work, we utilize a variational quantum compiling algorithm to design efficient three-qubit gates using a time-independent Hamiltonian composed of only physical interaction terms. The resulting gates, including the Toffoli and Fredkin gates, demonstrate high fidelity and robustness against both coherent and incoherent noise sources, including charge and nuclear spin noise. This method is applicable to a wide range of physical systems, such as superconducting qubits and trapped ions, paving the way for more resilient and universal quantum computing architectures.