Universal quantum computation with electronic qubits in decoherence-free subspace

TL;DR

This paper proposes a method for universal quantum computation using electron spins in a decoherence-free subspace, employing optical and spin manipulation tools for deterministic and scalable quantum processing.

Contribution

It introduces a novel scheme for deterministic universal quantum gates with electronic qubits in a decoherence-free subspace, enhancing robustness against dephasing.

Findings

Design of two noncommutable single-qubit gates

Implementation of a controlled phase gate

Scalable and robust quantum information processing

Abstract

We investigate how to carry out universal quantum computation deterministically with free electrons in decoherence-free subspace by using polarizing beam splitters, charge detectors, and single-spin rotations. Quantum information in our case is encoded in spin degrees of freedom of the electron-pairs which construct a decoherence-free subspace. We design building blocks for two noncommutable single-logic-qubit gates and a logic controlled phase gate, based on which a universal and scalable quantum information processing robust to dephasing is available in a deterministic way.