Synthetic Topological Qubits in Conventional Bilayer Quantum Hall Systems

TL;DR

This paper proposes a practical experimental setup to realize and detect topological qubits in bilayer fractional quantum Hall systems, advancing topological quantum computation with accessible methods.

Contribution

It introduces a new, experimentally feasible approach to create and observe topological qubits in bilayer FQH systems, expanding the types of topological qubits beyond Majorana modes.

Findings

Proposes a simple bilayer FQH system with electric gates for topological qubits.

Designs three experiments for detecting topological qubits and their properties.

Generalizes Majorana zero modes to more powerful topological qubits.

Abstract

The idea of topological quantum computation is to build powerful and robust quantum computers with certain macroscopic quantum states of matter called topologically ordered states. These systems have degenerate ground states that can be used as robust "topological qubits" to store and process quantum information. However, a topological qubit has not been realized since the proposed systems either require sophisticated topologically ordered states that are not available yet, or require complicated geometries that are too difficult to realize. In this paper, we propose a new experimental setup which can realize topological qubits in a simple bilayer fractional quantum Hall (FQH) system with proper electric gate configurations. Compared to previous works, our proposal is accessible with current experimental techniques and only involves well-established topological states. Our system can realize a large class of topological qubits, generalizing the Majorana zero modes studied in the recent literature to more computationally powerful possibilities. We propose three tunneling and interferometry experiments to detect the existence and non-local topological properties of the topological qubits.