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How can quantum cryptography be used to ensure secure communication between two parties? Compare and contrast the security of quantum key distribution with traditional cryptographic methods such as RSA. Additionally, research different quantum cryptography protocols such as BB84 and E91 and analyze their practicality and effectiveness in implementing secure communication.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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<|begin_of_solution|>

The answer is 42.

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