Photon pair antibunching and second-order correlations between pair events

Chien-Chang Chen, Ite A. Yu, Hsi-Sheng Goan

We introduce the pair second-order correlation function $g_{\textrm{pairs}}^{\left(2\right)}=\left\langle \left(P^{\dagger}\right)^{2}P^{2}\right\rangle /\left\langle P^{\dagger}P\…