The measurement problem in quantum mechanics looks at how an experimental outcome changes, simply by observing it.

"No phenomenon is a real phenomenon until it is an observed phenomenon." — John Archibald Wheeler We used to think the observer was a passive witness to the universe. What if the observer is part of ...

This article explores how our understanding of the universe has evolved—from the scale of everyday experience down to the ...

In quantum mechanics, "observation" is synonymous with quantum measurement and "observer" with a measurement apparatus and observable with what can be measured. Thus the quantum mechanical observer ...

A Hiroshima University team has designed a feasible way to detect the Unruh effect, where acceleration turns quantum vacuum ...

Researchers at Hiroshima University have developed a realistic, highly sensitive method to detect the Unruh effect—a long-predicted phenomenon at the crossroads of relativity and quantum theory. Their ...

The findings resolve a long-standing problem in fundamental physics. Scientists at Hiroshima University have created a ...

The world’s best clocks may be sensitive to an odd mix of quantum and relativistic effects that would stretch time and test ...