Pair detection correlation
= Pair detection correlation
{title2=$g^{(2)}(\Delta\mathbf r)$}
The <pair detection correlation> divides joint detection probability by the product of single detection probabilities. The baseline $g^{(2)}=1$ means independent detection; $g^{(2)}<1$ means suppressed pairs. Its value depends on the prepared <quantum state> and detector resolution, so exclusion alone does not require every experimental curve to reach zero.