Quantum Key Distribution: Is it as secure as claimed and what can it offer the enterprise?

Do the laws of physics trump mathematical complexity, or is Quantum Key Distribution (QKD) nothing more than 21st-century snake oil?

What this correspondent is not, is a physicist nor a mathematician, let alone a quantum cryptography expert. Thankfully, I know several people who are, so I asked them the difficult questions. Here’s how those conversations went.

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