54Q8 Check the boxes of the Two TRUE statements in the following list: Immediate

Question

54Q8

Check the boxes of the Two TRUE statements in the following list: Immediately after a spin measurement yielding the value S_z = n/2, a second measurement of S_z yields the value S_z/2 with certainty All spin-triplet states of two identical spin-1/2 are entangled. Suppose that two spin-1/2 particles prepared in a singlet spin state move very far apart. It is found that whenever a spin measurement on particle 1 gives the result a subsequent spin measurement on particle 2 gives with certainty Quantum mechanics explains this fact by saying that particle 2 must have had the definite value before any spin measurements were made on either of the particles. In Ekert's protocol for quantum key distribution, observed violations of a Bell- type inequality reveal the presence of eavesdroppers The BB84 method of quantum key encryption does not rely on entanglement.

Explanation / Answer

4th and 5th statement is true.

In the paper written by auther Artur Ekert and Alastair Kay " Bell Inequalities and Cryptography ": they have discussed about Bell inequalities. They have also mentioned that all noise is due to eavesdropping.

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