Abstract: Light is quantum. Hence, quantifying and attaining fundamental limits of transmitting, processing and extracting information encoded in light must use quantum analyses. This talk is aimed at elucidating this using principles from information and estimation theories, and quantum modeling of light. We will discuss nuances of “informationally optimal” measurements on so-called Gaussian states of light in the contexts of a few different metrics. We will discuss some examples from optical sensing, imaging and communications to illustrate how quantum analyses help quantify "classical-quantum gaps", and will end with a few open theoretical questions.
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