Imagine that, after breakfast, I dutifully went to the lab to perform some quantum physics experiments. The results of the experiments obviously depend on what I do in the lab. But, they shouldn’t depend on what happens outside of the lab, right?
I mean, why should laser light bouncing around through crystals and mirrors care what the current value of the S&P 500 is, let alone what I had for breakfast?
The conditions under which an experiment is performed are called its context. In practice, the contexts we consider are very limited to a few settings on the devices in the lab. But, maybe the temperature of the room is important. Were the lights on? Was the door open? Especially when things go wrong — which is more often than not — the context is where you look for answers.
The conditions under which an experiment is performed are called its context. In practice, the contexts we consider are very limited to a few settings on the devices in the lab. But, maybe the temperature of the room is important. Were the lights on? Was the door open? Especially when things go wrong — which is more often than not — the context is where you look for answers.
But some parts of the context are so far removed from the experiment that there is absolutely no way they could affect the results, such as that delicious muesli. (Did I mention it was toasted with a hint of maple and paired with a pot set Greek yoghurt?)
A theory is a set of mathematical rules that make predictions about the outcomes of experiments. Most theories automatically rule out most contexts simply by ignoring them. Dependence on other contexts are ruled out by experimentation.
A theory is a set of mathematical rules that make predictions about the outcomes of experiments. Most theories automatically rule out most contexts simply by ignoring them. Dependence on other contexts are ruled out by experimentation.
If there is no possible experimental arrangement in the lab that can distinguish what I had for breakfast, then the theory shouldn’t make reference to that context. Think of it as an application of Occam’s razor. Indeed, quantum physics makes no mention of breakfast choices.
As successful as quantum physics is, it is merely an operational theory. It’s like a lab manual with instructions about the preparations and expectations of experiments. It’s remarkably accurate, allowing us to engineer materials and devices which form the basis of all modern technology. But, it doesn’t tell us anything about reality — and that bothers a lot of physicists. READ MORE
As successful as quantum physics is, it is merely an operational theory. It’s like a lab manual with instructions about the preparations and expectations of experiments. It’s remarkably accurate, allowing us to engineer materials and devices which form the basis of all modern technology. But, it doesn’t tell us anything about reality — and that bothers a lot of physicists. READ MORE
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