Simulating topological tensor networks with Majorana qubits

TL;DR

This paper proposes a method to simulate topological quantum phases using Majorana qubits and tensor network theory, providing a simplified blueprint for realizing complex topological states with upcoming quantum device technology.

Contribution

It introduces a novel approach combining tensor networks with Majorana devices to simulate topological phases, exemplified by the double semion string-net, simplifying their realization.

Findings

Tensor network representation simplifies topological phase descriptions.

A practical blueprint for a double semion string-net using Majorana qubits.

Potential for experimental realization with future quantum devices.

Abstract

The realization of topological quantum phases of matter remains a key challenge to condensed matter physics and quantum information science. In this work, we demonstrate that progress in this direction can be made by combining concepts of tensor network theory with Majorana device technology. Considering the topological double semion string-net phase as an example, we exploit the fact that the representation of topological phases by tensor networks can be significantly simpler than their description by lattice Hamiltonians. The building blocks defining the tensor network are tailored to realization via simple units of capacitively coupled Majorana bound states. In the case under consideration, this yields a remarkably simple blueprint of a synthetic double semion string-net, and one may be optimistic that the required device technology will be available soon. Our results indicate that the implementation of tensor network structures via mesoscopic quantum devices opens up a powerful novel avenue toward the realization and quantum simulation of synthetic topological quantum matter.