A century-old thought experiment on wave–particle duality is brought into the laboratory using a single trapped atom ...
In the late 1970s, legendary physicist John Wheeler proposed a radical question: Exactly when does the universe notice that we're paying attention to a quantum experiment? And does it really matter?
Metal clusters made of thousands of atoms showed quantum interference, offering new insight into how large objects follow quantum rules.
Record-breaking experiment shows that a cluster of thousands of atoms can act like a wave as well as a particle.
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