Quantum criticality in the two-impurity Kondo model can be probed using entanglement witnesses, which are based on measurable spin and charge fluctuations. This approach has significant implications for understanding the behavior of quantum systems, particularly in the context of coupled quantum dots and magnetic impurities on surfaces. The two-impurity Kondo model is a well-studied system that exhibits quantum criticality, and the use of entanglement witnesses provides a new tool for characterizing this phenomenon. By analyzing the entanglement properties of the system, researchers can gain insight into the underlying quantum mechanics1. The development of entanglement witnesses for quantum criticality has important implications for the development of quantum technologies, including quantum computing and quantum cryptography. As quantum developments accelerate, the need for post-quantum cryptography planning becomes increasingly urgent, making research into quantum criticality and entanglement witnesses crucial for informing migration strategies.