As we deal with a two-level system, we have the normalisation relation :

The university offers a multi-facet two-level system of economic and business education.

It's a new two-level system in legal work.

The set of all states in a two-level system can be mapped onto a representation known as the Bloch sphere.

Let us consider two-level systems at different positions in space.

But this doesn't mean that all two-level systems must be viewed in that way.

The dissipative two-level systems represents also a paradigm in the study of quantum phase transitions.

Quantum systems with two possible states are sometimes called two-level systems.

He created a different two-level system.

Evidence favoring the two-level system over other systems includes data from African tone languages and Swedish.