Quantum Computation by Classical Mechanical Apparatuses

Abstract

We design a mechanical apparatus that works as "quantum" computer even though it follows classical physics. To do quantum computation, we need to know what percentage of a particular state is included in a superposed quantum state. However, the superposition easily breaks unless expensive and large-scale tooling, such as cryogenic temperature is prepared. We pay attention to causal formulation of quantum mechanics. The weighting coefficients of the superposition can be determined by monitoring the trajectory of a quantum particle. Such monitoring is possible only in macroscopic physics. Efficacy of our macroscopic apparatus model is shown in one of typical quantum algorithms, Deutsch algorithm. This classical mechanical design opens the way for "quantum mechanical" artificial intelligence to be mounted on robots in usual macroscopic world.