A.T. Kearney Co., Ltd. (Minato-ku, Tokyo, Representative in Japan: Takefumi Harigaya) has published a white paper titled "Quantum Communications - A Major Step Change for Security on the Way," examining the changes quantum communications will bring to security. This paper outlines that the implementation of quantum communication networks has already begun, post-quantum cryptography (PQC) is starting to move as a practical option to prepare for decryption by quantum computers in the near future, and while quantum key distribution (QKD) is designed to detect the presence of eavesdroppers, it involves physical implementation constraints such as dedicated fiber optic lines. While current communication networks are largely secure, they are not unbreakable. This paper states that the average time to identify a breach exceeds 200 days, and the average cost associated with a single data breach is over $4 million. With the increasing number of connected devices and the volume of data, organizations in both the public and private sectors need to start considering how to protect their data with quantum communications for the next decade and beyond. 1. By 2029, approximately 39 billion IoT devices; potential market for quantum communication tools to expand According to the paper, the number of connected IoT devices operating worldwide could reach approximately 39 billion by 2029, up from 15.7 billion in 2023. Furthermore, the volume of data generated, replicated, captured, and consumed globally is projected to increase from 120 zettabytes in 2023 to 181 zettabytes by 2025. Regarding this change, the paper suggests that as the number of connected devices transmitting data continues to grow, the potential market for quantum communication tools could eventually become enormous. Encrypted data such as personal information, financial data, and trade secrets may still hold value even 10 years from now, making it crucial to identify critical systems that need protection today as the f