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Tensor Hypercontraction with Qubitized QPE Produces Different Results from Reference Paper #1591

@vinayswamik

Description

@vinayswamik

I ran the example circuit provided in the
https://qualtran.readthedocs.io/en/latest/bloqs/phase_estimation/qubitization_qpe.html
However, the results I obtained do not match the reference paper cited in the documentation.
Specifically:

  1. Toffoli counts are significantly higher from those in the reference. I got 1300 trillion, in paper 33 billion.
  2. Qubit counts are very lower than expected values.I got 260 qubits, in paper around 2000 qubits.

I followed the standard setup as described, but the discrepancy persists. Could this be due to an implementation difference, a missing step in the documentation, or an issue with the default parameters?.

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