Dear Editor,

please find enclosed a manuscript on a combined theoretical/experimental work
on a what we believe is a new approach to assess the quantumness of a physical
system. While the combination of quantum physics with computer science led to
the emergence of many ideas how to possibly do some useful computation using
quantum physics, there have been many exciting inspirations to traditional
physics as well.

In the combined theoretical and experimental work we present in this
manuscript, we tried to use very elementary computer science concepts like the
compressibility of data sets to evaluate the "quantumness" of a real physical
system. We find that this plan seems to work, at least for  a maximally
entangled bipartite system, in the sense that the equivalent of an entropic
Bell inequality can be tested and found violated with relatively simple
computational tools applied to measured data.

To us, this looks like a funny combination of computer science and quantum
physics that may even help to "understand" entanglement not only in a
statistical, but perhaps algorithmic way. As this aspect may have reasonably
far reaching consequences, and we used openly available compression algorithms
for this demonstration, we felt that PRX may just be a very suitable platform
to present this work.

We therefore would kindly ask you for consideration of a publication in
Physical Review X. 

With Best Regards on behalf of all authors,

Christian Kurtsiefer