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Pcvl 833 use heralds at first step of feed forward #499

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@Aubaert Aubaert commented Dec 13, 2024

Breaking change (that was almost necessary): FFCircuitProvider can no longer be fed with AFFConfigurators (we must use a Processor to do so). This ensures that the circuit size of the FFCircuitProvider completely includes the configured circuits of the AFFConfigurator.

Performance checks:
On the feed-forward notebook:

  • using post-processed CNOT: speed multiplied by 1.5
  • using heralded CNOT: speed multiplied by 5
    (Note that the notebook is not using mask since it has a StateVector as input, so we will have gains most of the time, and always when using ancillary modes)

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