Control theory: Mother nature is an engineer

In the last 150 years, engineers have developed and mastered ways to stabilize dynamic systems, without lag or overshoot, using what's known as control theory. Now, a team of University of Arizona researchers has shown that ...

Making systems robust

The human body keeps the calcium concentration in the blood constant, similarly to an aircraft's autopilot keeping the plane at a constant altitude. What they have in common is that both the body and the autopilot employ ...

Maxwell's demon in the quantum Zeno regime

In the original Maxwell's demon thought experiment, a demon makes continuous measurements on a system of hot and cold reservoirs, building up a thermal gradient that can later be used to perform work. As the demon's measurements ...

Measuring the smallest vibration

EPFL scientists have used feedback to cool the motion of a micron-sized glass string to near absolute zero. This required building a sensor capable of resolving the smallest vibration allowed by quantum mechanics.

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