Quantum state comparison amplifier with feedforward state correction

L. Mazzarella, R. J. Donaldson, R. J. Collins, U. Zanforlin, G. Tatsi, G. S. Buller, J. Jeffers

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

3 Citations (Scopus)
14 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
Place of PublicationBellingham, Washington
Number of pages10
ISBN (Electronic)9781510618749
Publication statusPublished - 21 May 2018
EventQuantum Technologies 2018 - Strasbourg, France
Duration: 23 Apr 201825 Apr 2018


ConferenceQuantum Technologies 2018


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


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