Doublet state

In quantum mechanics, a doublet is a composite quantum state of a system with an effective spin of ⁠ 1 / 2 ⁠, such that there are two allowed values of the spin component, − ⁠ 1 / 2 ⁠ and + ⁠ 1 / 2 ⁠. Quantum systems with two possible states are sometimes called two-level systems. Essentially all occurrences of doublets in nature arise from rotational symmetry. Spin ⁠ 1 / 2 ⁠ is associated with the fundamental representation of the Lie group SU(2).

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