Superior resilience to poisoning and amenability to unlearning in quantum machine learning.

The reliability of artificial intelligence hinges on the integrity of its training data, a foundation often compromised by noise and corruption. Here, through a comparative study of classical and quantum neural networks on both classical and quantum data, we reveal a fundamental difference in their response to data corruption. We find that classical models exhibit brittle memorization, leading to a failure in generalization. In contrast, quantum models demonstrate superior resilience, underscored by a phase transition-like response to increasing noise, revealing a critical point beyond which the model's performance changes qualitatively. We further introduce a framework of quantum machine unlearning, the process of efficiently forcing a trained model to forget bad influences. We show that classical models form rigid, stubborn memories of erroneous data, while the quantum model is significantly more amenable to efficient forgetting with approximate unlearning methods. Our findings establish that quantum machine learning possesses the dual advantage of intrinsic resilience and efficient adaptability, providing a promising paradigm for the trustworthy and reliable artificial intelligence of the future.