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In quantum mechanics, superposition describes how two (or more) quantum states can be added together to produce another valid quantum state.



It means that every quantum state can be represented as a sum of two or more other distinct states.


Decay time

Quantum superpositions do not last forever. For an unstable particle the superposition |ψ would decay to either |1⟩ or |2⟩ in an everage time τ of the order


    ℏ Reduced Planck constant
    EG Gravitational self-energy


Example 1

An electron in the state |1⟩ + i |2⟩ is in a quantum superposition of the states |1⟩ and |2⟩.


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