Number of photons operator can be define as follows: [tex]\sum a_k^\dagger a_k [/tex].(adsbygoogle = window.adsbygoogle || []).push({});

Is it possible to define this operator locally and obtain operator [tex] \hat{n}(x,y,z)[/tex]of local density of number of photons so that [tex] \langle \psi |\hat{n}(x,y,z)|\psi\rangle = \rho(x,y,z)[/tex]. Thanks for reply.

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# Local density of number of photons

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