内容：

I’ll discuss the central question in the theory of quantum communication: What are the capabilities of a noisy quantum communication link? Addressing this question leads us to concepts like entanglement, a fundamentally quantum form of correlations which turns out to be a remarkably useful resource, new capabilities such as unconditionally secure cryptographic key agreement, and classically impossible kinds of synergy between independent communication links. More formally, it involves generalizing the classical notion of capacity to reveal a variety of notions of quantum channel capacity. These capacities are richer, and thornier, than what we find in the classical theory.
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