Find the odd sentence out:
[1] Quantum cryptography leverages the Heisenberg Uncertainty Principle to create eavesdrop-proof communication keys.
[2] Any clandestine attempt by a third party to measure a transmitted photon invariably perturbs its quantum state.
[3] Modern fiber-optic telecommunications rely on total internal reflection to transmit data packets at light speed.
[4] This perturbation immediately alerts the communicating parties that their encryption channel has been compromised.
Answer and explanation
Correct answer: D. Sentence 3
- Step 1: Sentences 1, 2, and 4 describe the physics of quantum key distribution (QKD), eavesdropping detection via photon state disruption, and information-theoretic security.
- Step 2: Sentence 3 discusses classical fiber-optic telecommunications relying on total internal reflection, which diverges from quantum cryptographic key distribution.
- Step 3: Hence, Sentence 3 is the odd sentence out.
Answer
Sentence 3.
Why not the others: Sentence 1 introduces the Heisenberg Uncertainty Principle in quantum cryptography; Sentence 2 explains that unauthorized measurement perturbs quantum photon states; Sentence 4 describes how this disturbance immediately exposes eavesdropping attempts.
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