We're all familiar with Schrodinger's cat thought-experiment, right? A quantum phenomenon may or may not kill a cat in a sealed box.
This article seems to suggest that the meta-experiment-- Lock a grad student in a sealed box with the boxed cat, and have him observe the condition-- has implications about the nature of time.
Consider instructing the grad student to write a PhD thesis based on what he observes of the lifespan of the cat (check on it every minute). When we (the unentangled observer) open the box, we may find either a complete or partially-written thesis, or a live cat. The quantum state of the box-grad-box-cat system is in the superposition of states that correspond to the progress of time within that system, but that progress is completely unobservable from outside the box, regardless of how God-like the outside observer is.
Now compare the state probabilities recorded by two outside observers in relative motion. They will not agree on the amount of time that has elapsed inside the box, but must agree on the probabilities involved (otherwise there would be a preferred reference frame). So they would have to agree that time in the box doesn't exist.
Unfortunately, I don't have the background to make this thought experiment mathematically rigorous for publication.