Quantum cryptography based on orthogonal states

Lior Goldenberg, Lev Vaidman

Research output: Contribution to journalArticlepeer-review


All existing quantum cryptosystems use nonorthogonal states as the carriers of information. Nonorthogonal states cannot be cloned (duplicated) by an eavesdropper. As a result, any eavesdropping attempt must introduce errors in the transmission, and, therefore, can be detected by the legal users of the communication channel. Orthogonal states are not used in quantum cryptography, since they can be faithfully cloned without altering the transmitted data. We present a cryptographic scheme based on orthogonal states, which also assures the detection of any eavesdropper.

Original languageEnglish
Pages (from-to)1239-1243
Number of pages5
JournalPhysical Review Letters
Issue number7
StatePublished - 1995


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