= Photon polarization
{title2=$|\psi\rangle=\alpha|H\rangle+\beta|V\rangle$}
{wiki}
= Photon polarisation
{synonym}
For a <photon> in a fixed spatial mode, the two transverse <photon polarizations> span a <qubit> space. A pure <photon polarization> state is $\alpha|H\rangle+\beta|V\rangle$ with $|\alpha|^2+|\beta|^2=1$, and a general state is a two-dimensional <density matrix>. Its <Bloch vector> gives the normalized Stokes parameters. Polarization-dependent path separation can correlate this internal degree of freedom with a path <qubit>.
// Target: quantum-error-correction.bigb
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