Think back to that quantum physics course you took. If you remember pieces of it, this article will get you interested all over again. And if you missed the college course, think about this: a photon detector created by researchers at Toshiba's research laboratory in Cambridge may hold the key to quantum cryptography because it appears to be able to count photons in such a way as to immediately intercept a hacker, making the optical data network impervious to spying eyes.

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