As AR and VR technology advances, the importance of effective security measures to protect user information and interactions in the evolving Metaverse grows. Because quantum computing poses a major threat to the security of existing cryptographic systems, we must immediately begin studying post-quantum cryptography alternatives. This study focuses on employing post-quantum cryptography techniques, especially Crystals-Kyber and Crystals-Dilithium, to boost the hardware and infrastructure enabling augmented reality and virtual reality Metaverse applications. Crystals-Kyber and Crystals-Dilithium are two post-quantum cryptography technologies that can withstand quantum attacks while remaining efficient. They provide the foundation for secure data transfer, user authentication, and content protection in AR/VR Metaverse applications, and their integration into hardware and infrastructure is investigated in this study. The principles of a secure infrastructure and hardware architecture are covered, including cryptographic protocols, network security methods, and secure hardware modules. Scalability, low-latency connection, and real-time data processing are also highlighted as specific to the Metaverse scenario. Furthermore, this article shows how Crystals-Kyber and Crystals-Dilithium interact with AR/VR software and technology to ensure that the user experience is not compromised. Our goal is to strike a compromise between security and usability, therefore we consider potential optimizations and performance effects. Including Crystals-Kyber and Crystals-Dilithium in the AR/VR Metaverse application architecture and hardware is an excellent method to defend against quantum attacks. As the Metaverse evolves, user privacy, data integrity, and the overall trustworthiness of this immersive digital universe must be secured by creating a solid security foundation. This article contains important information and suggestions for architects, developers, and stakeholders in the post-quantum Metaverse environment.