Quantum

Non-Orthogonal Amplitude Amplification for Hybrid CV-DV Quantum Processors

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Briefings

A new non-orthogonal amplitude amplification (NOAA) protocol for hybrid CV-DV quantum processors is introduced, addressing imperfect projector selectivity. The method establishes a fidelity bound dependent on initial target-state amplitude and operator selectivity, which limits performance. Mitigation strategies using squeezed CV ancillas and HQSP filters are proposed to reduce errors from imperfect target eigenenergy knowledge. Numerical simulations indicate NOAA outperforms repeat-until-success (RUS) for small initial amplitudes, while RUS remains efficient for large amplitudes.

Key points

• A non-orthogonal amplitude amplification (NOAA) protocol is introduced for hybrid continuous-variable-discrete-variable quantum processors to handle imperfect projector selectivity.
• Numerical simulations show NOAA achieves higher fidelity and efficiency than repeat-until-success (RUS) for small initial target-state amplitudes.

Context and limitations

The protocol's performance is bounded by the initial target-state amplitude and the selectivity of the accessible reflection operator. For large initial amplitudes, RUS is already efficient, offering little additional advantage from amplitude amplification.

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