In many cases tensor universality implies that multi-partite quantum-state processing is determined by what happens in totally disentangled cases. In independent systems relative time direction for the parts is arbitrary. This hints that time may be linked to entanglement and measurements and that there may be a measurement-only version of quantum mechanics. One-way quantum computation suggests that this may be possible.
George Svetlichny. "Quantum Information and the Problem of Time." J. Geom. Symmetry Phys. 9 67 - 74, 2007. https://doi.org/10.7546/jgsp-9-2007-67-74