Abstract
In this chapter, we provide a short but sufficient introduction to four topics that this thesis is built upon. It comprises of five sections on essential elements of convex geometry, the quantum resource theory formalism, quantum phase-space representation, and the notion of entropy in classical and quantum information. Importantly, the second section of this chapter deals purely with the mathematical concepts of algebraic and convex geometry that are necessary for a clear understanding of all other ideas provided. Respecting the fact that this is not generally easy for physicists to follow, we have done our best to bring the mathematical notions forward in an intuitive way with an eye on our language to be more sensible for physicists. Moreover, whenever possible, we have provided illustrations of the concepts.
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- 1.
The situation can be even worse, i.e., that the existence of the convergence point generally depends on the chosen notion of convergence.
- 2.
In fact, both the empty set and the \((-1,1)\) interval on itself are clopen sets.
- 3.
Except the sequence which is constant except at finitely many points.
- 4.
Note that, in a more general topological sense, this statement is not true because in that case interior points are defined using open sets rather than balls. This makes it possible to have interior points which are not limit points as in the example of discrete topological spaces.
- 5.
Note that by no means n is not unique, as it depends on which subcover has been chosen.
- 6.
Note that an affine transformation is not necessarily invertible, in the same way as a linear transformation on a vector space is not necessarily invertible. Here, by inverse image, we mean the domain on which the affine transformation is acting.
- 7.
This is because points inside a convex set usually allow for various decomposition in terms of the boundary points that contradicts the definition of a face.
- 8.
A monoid is simply a group without the necessity for containing inverse elements. In other words, it is the triplet \((\mathcal {S},\cdot ,e)\) such that (i) \(\mathcal {S}\) is closed under \(\cdot \); (ii) \(\cdot \) is associative; (iii) \(\mathcal {S}\) contains a unique identity element e with respect to \(\cdot \).
- 9.
This measure is the (regularized) relative entropy of the resource [16].
- 10.
Note that we have used PVMs only for simplicity reasons, and there is no restriction in extending the definition to the case where POVMs are considered.
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Shahandeh, F. (2019). Introduction. In: Quantum Correlations. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-24120-9_1
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