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Coherent perfect absorption (CPA) is an interference process associated withthe zeros of the scattering matrix that enables light-with-light interactionsin linear systems, of interest for optical computing, data processing andsensing. However, the noise properties of CPA remain relatively unexplored.Here, we demonstrate that CPA thermal noise signals exhibit a unique property:they are orthogonal to the signals transmitted through the network. In turn,such property enables a variety of thermal noise management effects, such asthe physical separability of thermal noise and transmitted signals, and"externally lossless" networks that internally host radiative heat transferprocesses. We believe that our results provide a new perspective on the manyCPA technologies currently under development.

Orthogonal thermal noise and transmission signals: A new coherent perfect absorption's feature