A high-Q microcavity is pumped to generate a coherent state of light. Which effect on photon statistics results from external driving of the cavity mode?

💡 Explanation

Coherent states of light, generated by driving a cavity mode, exhibit Poissonian statistics because their photon number distribution follows a Poisson distribution. This arises from the quantum coherence of the field, therefore the photon number fluctuations match a Poisson process, rather than thermal or super/sub-Poissonian distributions influenced by other quantum effects.

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