# Quantum signature in classical electrodynamics of the free radiation field

@article{Marrocco2015QuantumSI, title={Quantum signature in classical electrodynamics of the free radiation field}, author={Michele Marrocco}, journal={arXiv: Quantum Physics}, year={2015} }

Quantum optics is a field of research based on the quantum theory of light. Here, we show that the classical theory of light can be equally effective in explaining a cornerstone of quantum optics: the quantization of the free radiation field. The quantization lies at the heart of quantum optics and has never been obtained classically. Instead, we find it by taking into account the degeneracy of the spherical harmonics that appear in multipole terms of the ordinary Maxwell theory of the free…

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