When watching a movie of a physical process, one can conjecture whether it is running forward or backward in time by examining key physical parameters in the process. Here, the authors show that superpositions of (thermodynamic) quantum processes with opposite time’s arrows are also physically possible and observable, and explore the thermodynamic role played by the interference term.

While public space is traditionally shared by pedestrian and cars, the distancing measures imposed by the Covid-19 pandemic have underlined the need for wider pedestrian spaces. Here, the authors take a complex network approach to analyze sidewalk data from cities across the world to evidence a strong unbalance in the space distribution between cars and pedestrian, and propose a strategy to…

Network approaches are key to understand epidemic spreading, inherently driven by human mobility patterns and constrained by transport systems. In this work, the authors develop a country distance framework to capture the spread of COVID-19 on top of the airline network, analyzing the effectiveness of mobility restrictions in the presence of multiple outbreaks and suggesting strategies for…