Abstract

We present our recent theory [1] of frequency-filtered and time-resolved N-photon correlations or N-photon spectra, $g_{\Gamma }^{(N)}({\omega }_1,T_1;\dots ;{\omega }_N,T_N)$. There are an extension of the standard Nth order temporal correlation functions, g^(N)(T₁; …; T_N) (that measure the probability of emission of N photons at times T₁, …, T_N), into the frequency domain. Heisenberg uncertainty principle requires the introduction of the detector or filter frequency resolution, Γ, in the theory.

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