# On the Conservation of Information and the Second Law of Thermodynamics

## How can these fundamental laws be consistent?

9 min readApr 17, 2022

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The *conservation of quantum information*, quantified in term of von Neumann entropy, is a fundamental consequence of the linearity and unitarity of quantum mechanics. As the terms *information* and *entropy* are often used interchangeably in several branches of sciences, this may sound very strange to anyone familiar with the *second law of thermodynamics*, which says that entropy generally increases with time. **How can these claims be**…