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I think most of you are acquainted with that logical question concerning two guards, one of them always says lies while the other always says the truth.

Each one of these guards stands in front of one door....one of these two doors is the door of GOOD and the other, the door of EVIL. We don't know neither which guard tells the truth nor which door is the GOOD one.

The problem asks us to formulate just one question to be made to just one of these guards in order to provide us enough information to find out with certainty the GOOD door.

The answer or the right question may be: "If you were the other guard which door you would say is the GOOD door ?" And if he says this you should go to the other.

My question is based on the following:

you can make one question to one guard and easily discover if he tells the truth or not. Just ask something like "Do you have skin ? ".

But with this question, you had nothing concerning the doors attributes.

So we have the guards attributes and the doors attributes and with one question we can have precision in one of these two pieces of information but no information at all regarding the other.

Isn't this similar to uncertainty principle ?

Let the nature of the guards be the position information and let the nature of the doors be the momentum information. Let also the question be an experimental interrogation of the system. So, if you aim at position, nothing can be learned about momentum and vice - versa.

I wonder if there is somenthing in this classical context which can help seeing more in HUP.

Best Regards

DaTario

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# Classical example that presents quantum aspects

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