I've always that if everything exists in the Quantum field with no time constraintsall possibility at all times existing at oncethen why can't they access that field with a quantum computer. And then in the future, submit messages into the quantum field that can then be retrieved in the past. Of course, the whole system would have needed to be initiated in the past, but once the action is taken, it's effect will ripple years and years into the future in the blink of an eye. And just like that, you should be able to start receiving messages from the future.