Quantum amplifiers, quantum duplicators and quantum cryptography

Horace P. Yuen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations


Several methods for eavesdropping on the standard four coherent-state quantum cryptosystem together with a possible countermeasure are analysed and found to place a limit on the tolerable energy disadvantage of the users as compared to the eavesdropper. The possible significant role of the photon-number amplifier and the photon-number duplicator is indicated.

Original languageEnglish (US)
Pages (from-to)939-949
Number of pages11
JournalJournal of Optics B: Quantum and Semiclassical Optics
Issue number4
StatePublished - 1996

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)


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