Encoding quantum bits in bound electronic states of a graphene nanotorus

TL;DR

This paper proposes using electron states on a graphene nanotorus as a new quantum bit platform, demonstrating potential for quantum information processing with controllable and robust qubits based on external fields.

Contribution

It introduces a novel qubit implementation using bound electronic states in a graphene nanotorus and analyzes control methods and robustness for quantum computing applications.

Findings

Quantum states on a graphene nanotorus can encode qubits.

External magnetic and electric fields enable qubit initialization and gate operations.

Device robustness can be enhanced by optimal external control fields.

Abstract

We propose to use the quantum states of an electron trapped on the inner surface of a graphene nanotorus to realize as a new kind of physical quantum bit, which can be used to encode quantum information. Fundamental tasks for quantum information processing, such as the qubit initialization and the implementation of arbitrary single qubit gates, can then be performed using external magnetic and electric fields. We also analyze the robustness of the device again systematic errors, which can be suppressed by a suitable choice of the external control fields. These findings open new prospects for the development an alternative platform for quantum computing, the scalability of which remains to be determined.