Quantum mechanics definitively contains nonlocal effects (entanglement), which does seem to imply some kind of time traveling information, at least when combined with special relativity.
Kind of. Quantum states don't have on place or time. Only objects that share those states have locations.
The concepts like locality and physical object have become more specific over time.
Before QM, principle of locality in physics matched the common sense of locality in every sense. Object is directly influenced only by its immediate surroundings. Objects have locations. Field must mediate the action over distance.
After QM was developed, principle of locality in physics became more refined. Quantum states don't have location in space and time. They are not 'physical objects' themselves. Quantum states is everywhere in time and space where objects sharing that state are, and everything correlates perfectly over time and space.
Before QM, something like quantum-state would have been called a non-local thing. In current more refined meaning it's not breaking locality. Non-local instant quantum state 'hovering over wast distances of space and time' is OK as long as causality is local and moves at the speed of light.
