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Flaw Found in a Quantum Code

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Science  16 May 1997:
Vol. 276, Issue 5315, pp. 1034
DOI: 10.1126/science.276.5315.1034

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Quantum cryptography seemed foolproof. Because the very act of observing a quantum system--a single photon or particle--disturbs it, any effort to crack quantum secrecy should leave a detectable trace. But researchers have found that another quantum principle called entanglement, in which the state of one photon in a pair can reveal everything about its counterpart, can undermine some quantum-cryptography schemes.

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