## 3 Results
This stability underscores the system's robustness in maintaining high-quality quantum communication over extended periods, a critical factor for practical deployment in secure communication networks. Figure 5 shows the number of detections recorded over a 24-h period, providing a detailed view of the system's activity and performance during this time frame. In the Quantum Key Distribution (QKD) context, \"detections\" refer to the successful identification and reception of quantum signals that generate cryptographic keys. Each detection represents a successful measurement of a quantum bit (qubit) transmitted through the quantum channel. The data captured in the figure indicate the rate and consistency of these detections, which are critical for evaluating the system's efficiency and reliability. A stable and high detection rate suggests the QKD system effectively captures the quantum signals necessary for secure key generation. This stability is vital to maintaining a continuous and secure communication channel, as fluctuations in the detection rate could indicate issues such as signal loss, interference, or equipment malfunctions. In addition, the figure may highlight peak activity periods, which can correspond to times of increased data transmission and quieter periods. Analyzing these patterns can provide insights into the system's performance under different operational conditions, such as varying environmental factors or network loads. Overall, the data on detections over the 24-h period provide a comprehensive understanding of the QKD system's operational dynamics, contributing to assessing its capability to sustain secure and reliable quantum communications over extended durations. Figure 4: Visibility. Figure 6 presents the data on compression observed over the 24-h period, a parameter closely related to the error rate in the Quantum Key Distribution (QKD) system. Compression in this context refers to reducing the redundancy in transmitted data to protect against information leakage. Given the observed error rates, it measures how much information an unauthorized third party could potentially gain about the quantum key through intercepted data. In QKD systems, compression is a crucial step in ensuring the security of the generated keys. By assessing the compression level, we can infer the effectiveness of the privacy amplification process, which aims to eliminate any partial information that an eavesdropper might have obtained. The figure demonstrates that the compression was maintained at sufficient levels to ensure that the final key, after error correction and privacy amplification, remained secure and indistinguishable to an unauthorized observer. The stability in compression observed over the monitoring period indicates that the system consistently managed the error rates and maintained the necessary security margins to protect the quantum key. This stability is essential for ensuring that the cryp  
Figure 5: Detections. Figure 6: Compression. tographic strength of the key is preserved, preventing potential security breaches. The data, therefore, provide a critical validation of the QKD system's ability to maintain secure communications, highlighting the robustness of the implemented security protocols against eavesdropping attempts.