One-way quantum computing in a decoherence-free subspace

TL;DR

This paper proposes a one-way quantum computing scheme that encodes qubits in a decoherence-free subspace to protect against phase damping, enhancing robustness in optical lattice implementations.

Contribution

It introduces a novel encoding method for cluster states in a DFS, enabling decoherence-resistant one-way quantum computing.

Findings

Protects entangled resources from phase damping decoherence

Demonstrates implementation in optical lattice systems

Provides a framework adaptable to other decoherence types

Abstract

We introduce a novel scheme for one-way quantum computing (QC) based on the use of information encoded qubits in an effective cluster state resource. With the correct encoding structure, we show that it is possible to protect the entangled resource from phase damping decoherence, where the effective cluster state can be described as residing in a Decoherence-Free Subspace (DFS) of its supporting quantum system. One-way QC then requires either single or two-qubit adaptive measurements. As an example where this proposal can be realized, we describe an optical lattice setup where the scheme provides robust quantum information processing. We also outline how one can adapt the model to provide protection from other types of decoherence.