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Quantum mechanics increasingly penetrates modern technologies but, due to itsnon-deterministic nature seemingly contradicting our classical everyday world,our comprehension often stays elusive. Arguing along the correspondenceprinciple, classical mechanics is often seen as a theory for large systemswhere quantum coherence is completely averaged out. Surprisingly, it is stillpossible to reconstruct the coherent dynamics of a quantum bit (qubit) by usinga classical model system. This classical-to-quantum analogue is based on wavemechanics, which applies to both, the classical and the quantum world. In thisspirit we investigate the dynamics of macroscopic physical pendula with amodulated coupling. As a proof of principle, we demonstrate full control of ourone-to-one analogue to a qubit by realizing Rabi oscillations, Landau-Zenertransitions and Landau-Zener-St\"uckelberg-Majorana interferometry. Ourclassical qubit demonstrator can help comprehending and developing usefulquantum technologies.

Visualized Wave Mechanics by Coupled Macroscopic Pendula: Classical Analogue to Driven Quantum Bits