CUBIT: Capacitive qUantum BIT

TL;DR

This paper proposes a new type of cryogenic quantum bit based on the quantum capacitance of 2D Dirac materials like graphene, offering potential advancements in quantum computing hardware.

Contribution

It introduces a novel quantum bit design utilizing quantum capacitance nonlinearity in 2D materials, with analysis of anharmonicity and temperature sensitivity.

Findings

Quantum capacitance in 2D materials enables qubit operation.

Estimated properties suggest feasible fabrication of the proposed qubit.

Analysis of temperature effects on qubit parameters.

Abstract

In this letter, it is proposed that cryogenic quantum bits can operate based on the nonlinearity due to the quantum capacitance of two-dimensional Dirac materials, and in particular graphene. The anharmonicity of a typical superconducting quantum bit is calculated, and the sensitivity of quantum bit frequency and anharmonicity with respect to temperature are found. Reasonable estimates reveal that a careful fabrication process can reveal expected properties, putting the context of quantum computing hardware into new perspectives.