It is supposed to be absolutely secure – a means to transmit secret information between two parties with no possibility of someone eavesdropping. It is based on the principle that you cannot make measurements of a quantum system without disturbing it. Quantum cryptography works because a system’s quantum state cannot be observed without changing it. In the standard protocol, two users, typically known as Alice and Bob, openly share encoded information. They can only decode the information once they also share the secret quantum “key”. But they will always know if another party, typically known as Eve, tries to eavesdrop on the key, because by observing it she will always change its state. Yet it, according to Nature Photonics article published yesterday, is not without its faults.[1]
30th August, 2010 View Comments



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