Glossary

The “subatomic level” refers to the branch of physics that deals with particles smaller than an atom. These include electrons, protons, neutrons, and other elementary particles such as quarks and neutrinos. This level describes processes and phenomena that occur on the scale of atoms and their building blocks and are governed by quantum mechanics, where classical physical laws often no longer apply.

Superposition is a central concept in quantum mechanics, which states that a quantum object (e.g., a qubit) can exist in multiple states simultaneously. A qubit can therefore take on the values 0 and 1 at the same time until a measurement is performed. In quantum communication, this property is used to transmit complex information efficiently.