Universal quantum computation with quantum-dot cellular automata in dephasing-free subspace

TL;DR

This paper proposes a scalable quantum computing scheme using quantum-dot cellular automata in a dephasing-free subspace, enabling high-fidelity, deterministic, and robust quantum computation against collective dephasing errors.

Contribution

It introduces a novel QCA-based design for universal quantum computation within a dephasing-free subspace, enhancing robustness and scalability.

Findings

Suitable for DFS encoding with electrons tunneling in two dimensions

Supports high-fidelity and deterministic quantum operations

Robust against collective dephasing errors

Abstract

We investigate the possibility to have electron-pairs in dephasing-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to carry out a high-fidelity and deterministic universal quantum computation. We show that our QCA device with electrons tunneling two dimensionally is very suitable for DFS encoding, and argue that our design favors a scalable quantum computation robust to collective dephasing errors.