Articles for subject Physics
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The MerminPeres magic square is a neat demonstration of measurement contextuality.

Projectors are linear operators with the property that the square of the operator is the operator.

Observables and Projective measurements. The Born rule. Expectation and variance of observables and uncertainty principle.

Quantum mechanics can be encapsulated by a set of postulates. In this set we will take the Hilbert space \(\mathcal{H}\) as the primary object.

Innerproducts and norms are defined. Equipping a vector space with an innerproduct gives an innerproductspace, and let’s us define bases.

Communication through memoryless static channels will be examined, and in particular using repetition codes to counteract the errors introduced by the channel.

Conditional entropy.

The joint entropy and its properties

The relative entropy, or KullbackLeibler divergence is a measure of the difference of two distributions

Mutual information.