Enhancing Temporal Quantum Coherence in Graphene-based Superconducting Circuits

Abstract

Temporal quantum coherence is essential for the successful operation of quantum computers, and graphene-based superconducting circuits offer a promising platform for advancing these technologies. However, decoherence mechanisms – including thermal fluctuations, electromagnetic interference, material defects, and quasiparticle dynamics –  limit the achievable coherence times. This paper explores strategies for mitigating decoherence and enhancing temporal quantum coherence in graphene-based superconducting circuits. We employ a combination of theoretical modeling and experimental techniques to investigate the primary sources of decoherence. Density functional theory and tight-binding simulations are used to analyze the impact of material defects on electron behavior and coherence.  We propose targeted material quality enhancements through optimized synthesis and post-synthesis treatments.  Additionally, we examine the effectiveness of environmental isolation techniques, such as cryogenic environments, electromagnetic shielding, and vacuum encapsulation. Our results demonstrate a significant improvement in coherence times following the implementation of these strategies. We provide a comparative analysis of environmental isolation techniques, highlighting their differential performance under various conditions.  Detailed data on the temperature and material dependence of shielding efficiency against electromagnetic interference is also presented. These findings emphasize the crucial role of both material optimization and environmental control in preserving quantum coherence within graphene-based superconducting circuits. Our study offers valuable guidelines for the development of more robust and reliable quantum computing systems, contributing to advancements in this rapidly evolving field.