Can quantum privacy protocols share more information while hiding more?

Quantum local differential privacy — a quantum generalization of the gold standard in data privacy — can transmit at least 50% more useful information than its classical counterpart while providing equal privacy guarantees, as long as the private data has three or more possible values. The same 3/2 quantum advantage appears across multiple measures of utility, from mutual information to hypothesis-testing error rates, suggesting a deep structural reason rather than a coincidence. This sets a concrete benchmark for when quantum communication channels are worth using in privacy-sensitive applications.