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07-Feb-2005

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Quantum Computing: Safer Coin Tosses Point to Better Way for Enemies to Swap
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Excerpts: Alice tosses the "coin" by forcing one photon's angular momentum to
take one of four possible states, two of which represent "heads" and two of
which represent "tails." This changes the state of the other entangled photon,
which is sent to Bob. Bob measures his photon, but (...), he's unable to
determine whether Alice picked heads or tails. He calls the flip--tells Alice
heads or tails--and then Alice reveals which of the four states she picked,
allowing Bob to verify instantly whether he won or lost the toss.
Source: Quantum Computing: Safer Coin Tosses Point to Better Way for Enemies to
Swap Messages[ http://www.sciencemag.org/cgi/content/full/307/5710/655a ],
Charles Seife Science, Science 655, 05/02/04

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