The world of quantum mechanics is completely unlike anything we experience in our everyday lives.
The laws that govern the behaviour of the very smallest particles are completely different to classical physics, which makes them incredibly different to understand and even more difficult to study.
By developing a new method to measure the quantum states of hundreds of atoms at once, physicists have been able to see a particular effect of quantum mechanics, called a Bell correlation, for the first time in a large system.
In a sense, the atoms in a Bell state have no properties because they can't be thought as having properties until a measurement is made.
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