Bell's Inequality
Why Physics Stack Exchange recommends it
Physics Stack Exchange users cite it as the source of a worked Bell's inequality example when asking about hidden variables, photon polarization correlations and the video's counting argument.
Recommended by 2 people across 2 different months, 2013 to 2023.
What it is
A 26-minute whiteboard-style lecture by DrPhysicsA that introduces Bell's inequality. It walks through a three-polarizer-setting example with entangled photon pairs to show that local hidden variables, as proposed by EPR, cannot reproduce the correlations seen in experiments.
What people said
Recommends kansi · 2013-06 · Physics Stack Exchange · on “Can we measure two entangled qubits in two different bases simultaneously?”
can u please elaborate ur answer and explain it in simple english, also please have a look at first 4 min of this vedio [this video]
Recommends user353810 · 2023-10 · Physics Stack Exchange · on “Does a process that creates a pair of photons have the same polarization and also the same output of a hidden variable if it existed?”
After watching this video on Bell’s inequality here [this video] , it mentions that if you have a process for pair production, in this case a photon pair where the photons travel in opposite directions, the polarization of each photon will be the same. In the video, he uses this example to eventually show what Bell’s inequality is and how it is violated in experiments ruling out hidden variables that are local. However, the analysis depends upon two things. First, he says that the polarization of each photon would be the same, and that this has been demonstrated experimentally. Secondly, he says that if there was a hidden variable that determined whether each photon will go through a particular k
Cites John Fistere · 2016-07 · Physics Stack Exchange · on “Bell's Inequality: Hypothetical results question”
In the following video: [this video] DrPhysicsA describes the results of an experiment involving three polarized mirrors randomly selected by the perennial Alice and Bob. [LINK] The first three columns represent possible pre-determined polarizations (hidden variables) of entangled photons sent to Alice's and Bob's randomly selected mirrors, A, B, and C. The second three columns represent the possible results of observations by Alice & Bob for three different combinations of mirrors. The results tabulated show that considering only the middle six rows there will be six occurrences when Bob and Alice measure the same result, either no photon is detected by both, or they both detect a photon. Accord