Hi there, In Brian Cox’s book “The Quantum Universe” he states that after t=0, a quantum system is everywhere in the universe. Does this apply to all situations (experiments, etc.), and both micro and macro objects? If so, in delayed-choice entanglement swapping experiments we deliberately delay photons reaching detectors until other photons are registered. But if the above paragraph is true, wouldn’t the photons already have reached the detectors if they are to be anywhere else in the universe? So sending photons along a longer fibre optic cable, compared to other photons, doesn’t really delay them at all? Unless I’m missing something… Cheers for any clarifications.