Atom throwing allows them to move without interacting with their environment or losing any quantum information they may hold.
One of the challenges with quantum information is finding ways of moving it from one place to another, while preserving its quantum properties. Charged particles, like electrons, are easy to move but tend to interact with stray electric and magnetic fields, allowing quantum information to leak away.
Since then, optical tweezers have developed into sensitive instruments that can pick up atoms, move them around and even hold them in giant lattices consisting of hundreds of atoms, like eggs in a giant egg box. Nevertheless, Hwang and colleagues imagined using the tweezers to accelerate an atom and then release it, effectively throwing the atom like a baseball pitcher. The same device can also catch the atom, like an optical baseball mitt.
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