Fock basis
= Fock basis
{c}
{title2=$|n_1,n_2,\ldots\rangle$}
An orthonormal basis labelled by the occupations of specified single-particle modes. For one bosonic mode, $|n\rangle=(a^\dagger)^n|0\rangle/\sqrt{n!}$ and the <number operator> has eigenvalue $n$. A <coherent state>'s expansion in this basis gives its overlap and photon-number statistics.