Quantum state comparison amplifier with feedforward state correction

L. Mazzarella*, Ross J. Donaldson, Robert John Collins, Ugo Zanforlin, G. Tatsi, Gerald Stuart Buller, J. Jeffers

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)
41 Downloads (Pure)


Quantum mechanics imposes stringent constraints on the amplification of a quantum signal. Deterministic amplification of an unknown quantum state always implies the addition of a minimal amount of noise. Linear and noiseless amplification is allowed in principle provided that it only works probabilistically. Here we present a probabilistic amplifier that combines two quantum state comparison amplifiers (SCAMP) together with a feed-forward state correction strategy. Our system outperforms the unambiguous state discrimination (USD) measure-and-resend based amplifier in terms of the success probability-fidelity product and requires a more complex experimental setting.

Original languageEnglish
Title of host publicationQuantum Technologies 2018
EditorsJürgen Stuhler, Andrew J. Shields, Miles J. Padgett
ISBN (Electronic)9781510618756
ISBN (Print)9781510618749
Publication statusPublished - 21 May 2018
EventQuantum Technologies 2018 - Strasbourg, France
Duration: 23 Apr 201825 Apr 2018

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceQuantum Technologies 2018
Internet address


  • coherent states
  • optical amplifier
  • probabilistic amplifier
  • Quantum amplifier
  • quantum technologies
  • state amplification
  • state comparison

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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