the cryptographic secret in the same way that the state of one CHSH player’s qubit depends on the secret measurement basis of the other player. An alternative interpretation, from the perspective of Bell’s theorem, is that the protocol can be thought of as a ‘single-detector Bell test’...
Bell's theorem on the other hand states that no real or physical local hidden variable theory can reproduce all the predictions of quantum mechanics. The third card game is an analogy to represent some of the actual experiments where two entangled particle (which are very hard to produce) are...
An alternative interpretation, from the perspective of Bell’s theorem, is that the protocol can be thought of as a ‘single-detector Bell test’—the cryptographic task generates the same single-qubit state as would be produced by entangling a second qubit and measuring it with another detector...