On-chip implementation of the probabilistic quantum optical state comparison amplifier

David W. Canning, Ross J. Donaldson*, Sebabrata Mukherjee, Robert J. Collins, Luca Mazzarella, Ugo Zanforlin, John Jeffers, Robert R. Thomson, Gerald S. Buller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
58 Downloads (Pure)


Propagation losses in transmission media limit the transmission distance of optical signals. In the case where the signal is made up of quantum optical states, conventional deterministic optical amplification schemes cannot be used to increase the transmission distance as the copying of an arbitrary and unknown quantum state is forbidden. One strategy that can offset propagation loss is the use of probabilistic, or non-deterministic, amplification schemes - an example of which is the state comparison amplifier. Here we report a state comparison amplifier implemented in a compact, fiber-coupled femtosecond laser-written waveguide chip as opposed to the large, bulk-optical components of previous designs. This pathfinder on-chip implementation of the quantum amplifier has resulted in several performance improvements: the polarization integrity of the written waveguides has resulted in improved visibility of the amplifier interferometers; the potential of substantially-reduced losses throughout the amplifier configuration; and a more compact and environmentally-stable amplifier which is scalable to more complex networks.

Original languageEnglish
Pages (from-to)31713-31726
Number of pages14
JournalOptics Express
Issue number22
Early online date17 Oct 2019
Publication statusPublished - 28 Oct 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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