You may be interested "Deterministic Quoting"[1]. This doesn't completely "solve" hallucinations, but I would argue that we do get "good enough" in several applications
Disclosure: author on [1]
Disclosure: author on [1]
It's the yes we hallucinate but don't worry because we provide the sources for users to check.
Even though everyone knows that users will never check unless the hallucination is egregious.
It's such a disingenuous way of handling this.