[
    {
        "id": "osp-18876",
        "type": "article-journal",
        "title": "Non-Orthogonal Amplitude Amplification for Hybrid CV-DV Quantum Processors",
        "author": [
            {
                "family": "Liu",
                "given": "Jiyuan"
            },
            {
                "family": "Bierman",
                "given": "Joel"
            },
            {
                "family": "Liu",
                "given": "Yuan"
            }
        ],
        "URL": "https://omanscience.com/en/articles/non-orthogonal-amplitude-amplification-for-hybrid-cv-dv-quantum-processors",
        "language": "en",
        "issued": {
            "date-parts": [
                [
                    2026
                ]
            ]
        },
        "abstract": "We introduce a non-orthogonal amplitude amplification (NOAA) method for hybrid continuous-variable- discrete-variable (CV-DV) quantum processors, where the available CV-assisted projector is not perfectly se- lective for the target state. We establish a bound on the achievable target-state fidelity, which is determined by the initial target-state amplitude and the selectivity of the accessible reflection operator. This bound limits the performance of NOAA in hybrid CV-DV systems. To mitigate this limitation, we propose using a squeezed CV ancilla to reduce the overlap between relevant CV states and a hybrid quantum signal processing (HQSP) filter to suppress errors arising from imperfect knowledge of the target eigenenergy. Numerical simulations show that, for small initial target-state amplitudes, our protocol achieves higher fidelity and efficiency than the repeat-until-success (RUS) method despite the presence of non-orthogonality. For large initial amplitudes, RUS is already efficient, and amplitude amplification provides little additional advantage."
    }
]