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_2 = h/2, a second measurement of S_z yields the value S_z = h/2 with certainty. All spin-triplet states of two identical spin-1/2 particle 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 S_z = h/2, a subsequent spin measurement on particle 2 gives S_z = -h/2 with certainty Quantum mechanics explains this fact by saying that particle 2 must have had the definite value S_z =-h/2 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

The statements 1, 3, 4 are true. Ekert protocol rely on the violation of Bell's inequality.

BB84 is the first cryptography protocol based on entanglement.

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