Quantum Optical State Comparison Amplifier

Electra Eleftheriadou, Steve Barnett, John Jeffers

Research output: Contribution to journalLetterpeer-review

21 Citations (Scopus)


It is a fundamental principle of quantum theory that an unknown state cannot be copied or, as a consequence, an unknown optical signal cannot be amplified deterministically and perfectly. Here we describe a protocol that provides nondeterministic quantum optical amplification in the coherent state basis with high gain and high fidelity and which does not use quantum resources. The scheme is based on two mature quantum optical technologies: coherent state comparison and photon subtraction. The method compares favorably with all previous nondeterministic amplifiers in terms of fidelity and success probability.
Original languageEnglish
Article number213601
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 19 Nov 2013


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