Most scientists have believed that the instant a quantum object was measured it would "collapse" from being in all the locations it could be, to just one location like a classical object. 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.Now if only I could decypher what Mother Nature is telling us about the nature of Reality.
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.
Because theorists had believed since 1926 that a measurement of a quantum particle inevitably forced a collapse, it was said that in a way, measurements created reality as we understand it. Katz, however, says being able to reverse the collapse "tells us that we really can't assume that measurements create reality because it is possible to erase the effects of a measurement and start again."
Is it consistent with the "Many Worlds" interpretation of Quantum Mechanics? Having a do-over before a particular branch of the Multiverse is chosen as the perceived one? I don't know, this is getting beyond my pay grade.
More on Quantum Mechanics and the nature of Reality at a previous post, The Real, the Complex, and the Imaginary.
This means something. But I have no idea what.