Why does the channel capacity of a quantum communication system using entangled photons degrade under decoherence?

💡 Explanation

Decoherence causes a loss of quantum entanglement, thereby reducing the number of effectively usable qubits for communication. Because channel capacity depends directly on the number of qubits, its degradation results from diminished entanglement, therefore reducing effective channel capacity, rather than just from increased noise or signal distortion.

• Why does an adult chimpanzee often fail to accurately interpret the alarm calls of a newly introduced chimpanzee from a different social group?
• Why does an appeal to 'logos' often fail to persuade a jury even when the logical argument is sound?
• If a speaker abruptly shifts from discussing urban development to astrophysics without signaling, which consequence follows in a listener's comprehension?
• Why does stable bilingualism not always prevent complete language attrition among migrant populations in contact situations?
• Across regions exhibiting a dialect continuum, which outcome arises when a dense bundle of isoglosses coincides with a major physical barrier such as a mountain range?
• Why does a person comprehend 'a heated debate' using temperature concepts?