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Are there parallel universes? And how will we know? This is one of many fascinations people hold about quantum physics. Researchers from the universities of Calgary and Waterloo and the University of Geneva in Switzerland have published a paper in Physical Review Letters explaining why we don't usually see the physical effects of quantum mechanics.

"Quantum physics works fantastically well on small scales but when it comes to larger scales, it is nearly impossible to count photons very well. We have demonstrated that this makes it hard to see these effects in our daily life," says Christoph Simon, who teaches in the physics and astronomy department and is one of the lead authors of the paper entitled: Coarse-graining makes it hard to see micro-macro entanglement.

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