Light has particle properties; a single-photon is a single particle of light. As it is impossible to divide a single-photon any further, data carried by a single-photon cannot be copied.
 quantum encryption data transmission
Also known as quantum cryptography, a transmission technology that utilizes quantum mechanics to enable communicating parties to securely share a private key that is necessary for deciphering. Private key data is transmitted by single-photons. BB84 protocol is the closest to practical application of quantum encryption for data transmission.
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Date: 15 July, 2004
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