Quantum particles exist in multiple places at once, but the moment you measure a particle it collapses into one place, thus acting like a classical object such as your computer, which exists in only one place at any given moment. That's it. The quantum object is either in multiple places or it's measured and in one place. Until now.
Duh Duh Dunnnn!
Take it away, University of Rochester press release.
Jordan proposed that it would be possible to weakly measure the particle continuously, partially collapsing the quantum state, and then "unmeasure" it, causing the particle to revert back to its original quantum form, before it collapsed.
Jordan's hypothesis suggests that the line between the quantum and classical worlds is not as sharply defined as had been long thought, but that it is rather a gray area that takes time to cross.
In the latest issue of Nature News, Postdoctoral Fellow Nadav Katz explains how his team put the idea to the test and found that, indeed, he is able to take a "weak" measurement of a quantum particle, which triggered a partial collapse. Katz then "undid the damage we'd done," altering certain properties of the particle and performing the same weak measurement again. The particle was returned to its original quantum state just as if no measurement had ever been taken.
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