Enhanced Photonic Maxwell's Demon with Correlated Baths

Since the Second Law of Thermodynamics development, several proposals to test its limits have been created. The thought experiment, known as Maxwell’s Demon, appeared as a system that could extract work or reduce the system’s entropy, using the Demon’s information with no energy consumption. Here we implement the first photonic Maxwell’s Demon with active feedforward where no post-selection is needed. The feedforward is implemented in a fiber-based system using Ultrafast optical switches that, given its versatility, allow us to implement the study in the single-photon level of several photon statistics as uncorrelated thermal baths (thermal light), split thermal beam, correlated (entangled states), and anticorrelated thermal baths (NOON states). Furthermore, this study shows that the classical correlations provided by quantum states can increase the Demon’s efficiency by almost one order of magnitude.