Note on Presenting the Hamiltonian

Yasushi Takahashi, Mari Iibu

Aleš Lacina

The useful analogy between stationary quantum states of the particle confined to the finite area and standing waves of a continuous medium is mostly treated incorrectly. The weak points of such presentations are indicated and the correct elementary explanation of energy quantisation is given.

Gloria Paradisi, Hugues Randriambololona

In this note we construct a quantum Fourier transform circuit in a recursive way, by directly copying the 'divide and conquer' construction of the fast Fourier transform algorithm, rather than using the explicit formula that is given in most introductory texts to quantum computation. We do not pretend this presentation to be original, nor claim for any anteriority. The aim of this paper is purely pedagogical.