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How many channels can a photonic system support?
Paul Virally, Pengning Chao, Alessio Amaolo, Alejandro Rodriguez, Sean Molesky
https://arxiv.org/abs/2510.01128 https://

How many channels can a photonic system support?
We develop a general method to bound the ordered singular values (channel amplitudes) of the electromagnetic Green function for arbitrarily structured linear photonic systems. The approach yields computable, quantitatively predictive, upper bounds on the $n^{th}$ singular value that capture the complexity of multi-channel tradeoffs from the device perspective. As an illustration of the practical value of the framework, indexed channel bounds are obtained for multi-wavelength scale three-dimensi…