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Add this Tag for questions on information theory applied to physics, especially in the fields of statistical mechanics and thermodynamics, the black hole information paradox, complexity of dynamical and physical systems and questions to do with whether information is conserved by physical systems. Use the tag quantum information if your question is to do with information theoretic concepts applied to quantum states.

This is simply because of how entropy is defined: a measure of the number of specific realizations or microstates that may realize a thermodynamic system in a defined state specified by macroscopi …
answered Jan 30 '16 by glS
Potentially infinite. You can encode information into continuous degrees of freedom of a particle, and then the question becomes only of how much information are you able to reliably encode and … decode with your technical capabilities. As an example, you can take a single photon and encode information in the transverse spatial profile of its wavefunction (for example using the orbital angular …
answered Jan 22 '18 by glS
A non-pure state describes "classical uncertainty" as to what is the actual quantum state, so under the assumption of a demon having complete knowledge of the quantum state of the universe, I would sa …
answered May 24 '18 by glS
this conclusion because you interpret the entropy as lack of information (fair), and because the entanglement entropy $S$ is the entropy of the state you reach your conclusion. However, note that $S … increases your uncertainty over the measurement results on the other part. This makes sense because entanglement is all about information that is encoded and can be accessed only by operating on the full …
answered Jan 22 by glS