52、Quantum Communication: Coherence, Privacy, and Coding Trade - Offs

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于 2025-09-24 09:13:30 发布

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分类专栏：量子信息理论入门指南文章标签： Quantum Communication Coherent Communication Private Classical Communication

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Quantum Communication: Coherence, Privacy, and Coding Trade - Offs

1. Coherent Communication and Trade - Off Coding

In the realm of quantum communication, maintaining quantum coherence is a crucial concept. When Alice and Bob perform encoding and decoding in superposition, they can execute powerful protocols. In both entanglement - assisted coherent communication and coherent state transfer, Alice uses controlled gates instead of conditional gates. Bob, on the other hand, conducts coherent measurements that place measurement outcomes in an ancilla register without destroying superpositions.

The key step in both protocols is Bob’s final action of performing a controlled decoupling unitary. This ensures that the state of the environment is independent of