Which outcome occurs when measuring spin on one photon of an entangled pair used in quantum key distribution?

💡 Explanation

When measuring the spin of one photon of an entangled pair, instant correlation dictates that the other photon's spin state is instantaneously known, because entanglement creates a linked quantum state regardless of distance, establishing a shared key bit. Therefore instant correlation is achieved, rather than decoherence, polarization shift or wavelength shift which involve other mechanisms.

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