Scientists drag quantum mechanics into the visible realm

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All sorts of counterintuitive behavior happens with regularity in the quantum realm, but very little of that bleeds over into the world of classical mechanics that the human senses occupy. We can register the effects of the quantum behavior of electrons and atoms, but the actual objects that undergo tunneling and entanglement are invisible to the naked eye. In the last couple of years, however, researchers have started working with mechanical oscillators that can display quantum behavior in some circumstances. A paper that will be released by Nature now provides pretty unambiguous evidence for quantum interactions between a standard qubit and a piezoelectric device that's roughly 50µm long—large enough to be seen with the naked eye.

This isn't the first paper to describe quantum behavior in a mechanical device, but it seems to be one of the cleanest. For the most part, the work has focused on microscopic levers, where the vibrational modes can be characterized in terms of a quantum mechanical unit called a phonon. The number of modes accessible increases rapidly as temperature goes up, which is why vibrations never appear to be quantum mechanical in our day-to-day experience.

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