Blog: Heisenberg’s uncertainty principle still certain

Despite rumors to the contrary, a mainstay of quantum physics is just as (un)certain as ever.

By Laura Sanders, 16:30 PM August 5, 2010

At first glance, a Nature Physics paper published online July 25 may have appeared to threaten the Heisenberg uncertainty principle, which says that in the quantum world of electrons, photons and other tiny particles it’s impossible to know certain pairs of physical properties, such as a particle’s position and the momentum, at the same time.

The paper reports that in certain quantum scenarios, it’s possible to have a device that stores knowledge of the exact position and exact momentum of...

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