I agree with these two lucid, sensible articles:
- Quantum Cryptography: As Awesome As It Is Pointless, by Bruce Schneier
- Quantum Snake Oil, by Matt Weir
(Bruce Schneier is a well-know cryptographer, computer security specialist, and writer. He is the author of several highly regarded books on computer security and cryptography. His undergraduate BS was in physics, so he is quite capable of understanding quantum cryptography in detail)
I too believe that quantum crypto, though beautiful physics, is pointless in practice. So why then do governments in the US and Europe continue to waste millions of dollars per year to fund this? One can only conclude that the scientists selling this to their governments are being disingenuous in their sales pitches. Too bad. The resources being taken up by quantum cryptography could be put to much better use within the meta field of quantum information. For instance, those resources could be put into trying harder to build a large scale quantum computer, and into writing software for it. It seems that some of the people doing quantum information research are not truly interested in building a quantum computer. Their main priority is to get research funding for something, no matter what, even if it’s not such a good topic and selling it requires plenty of fibbing. Often, rather than changing their research topics over time, they want to continue to get research funding forever, for the same old topic which has lost its luster long ago.