The quantum realm contains profound mysteries. Here, New Scientist editors have selected some of our most mind-bending feature-length articles about the deepest layer of reality we know
Untangle the weirdness of reality with our monthly newsletter.This idea that things only become recognisably “real” when we observe or measure them seems utterly mad and yet most physicists have long since swallowed any philosophical qualms about that.
Our best theory of reality says things only become real when we look at them. Understanding how the universe came to be requires a better explanationErwin Schrödinger’s famous thought experiment says that a cat trapped in box with some gubbins that could kill it is simultaneously dead and alive, until you open said box. It was devised to illustrate the absurdity of quantum theory’s insistence that things only become real when we observe them.
A twist on the famous Schrödinger’s cat thought experiment could undermine quantum physics – or provide a path to a deeper understanding of how the world works.What happens when the quantum fuzz of probabilities manifests as something definite? The long-held assumption is that the individual outcome of a measurement occurs at random and therefore that the universe at its most fundamental is indeterministic, or governed by chance.
Superdeterminism makes sense of the quantum world by suggesting it is not as random as it seems, but critics say it undermines the whole premise of science. Does the idea deserve its terrible reputation?Quantum entanglement is where two widely separated particles appear to influence one another despite having no way of communicating.
Inspired by experiments showing entanglement over time, not just space, physicist Vlatko Vedral is reconsidering the way we think of time in quantum mechanics. The new approach treats space and time as part of one entity and could help us unravel black holes and make quantum time travel possible.Einstein referred to quantum entanglement as “spooky action at a distance”, but it is far from the only hauntingly weird feature of the subatomic world.
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