Are weak values quantum? Don’t bet on it: Key technique used to probe quantum systems may not be so quantum after all

24 septiembre 2014

Over the past 20 years, a strange idea called a «weak value» has taken root in quantum information science. Many of the things you can do with quantum technologies entail being able to gain information from quantum systems. But there is a quantum conundrum: we can’t say what a particle is doing when we’re not looking at it, but when we do look at it, we change its behavior. But what if we could look «a little»?