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- W4289446078 abstract "The problem of Phase Estimation (or Amplitude Estimation) admits a quadratic quantum speedup. Wang, Iggott and Brierly [2019, Phys. Rev. Lett. 122 140504] have shown that there is a continuous trade-off between quantum speedup and circuit depth (by defining a family of algorithms known as $alpha$-VQE). In this work, we show that the scaling of $alpha$-VQE can be naturally and succinctly derived within the framework of Quantum Singular Value Transformation (QSVT). From the QSVT perspective, a greater number of coherent oracle calls translates into a better polynomial approximation to the sign function, which is the key routine for solving Phase Estimation. The better the approximation to the sign function, the fewer samples one needs to determine the sign accurately. With this idea, we simplify the proof of $alpha$-VQE, while providing a new interpretation of the interpolation parameters, and show that QSVT is a promising framework for reasoning about classical-quantum interpolations." @default.
- W4289446078 created "2022-08-02" @default.
- W4289446078 creator A5056639282 @default.
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- W4289446078 date "2022-07-29" @default.
- W4289446078 modified "2023-10-16" @default.
- W4289446078 title "Simplifying a classical-quantum algorithm interpolation with quantum singular value transformations" @default.
- W4289446078 doi "https://doi.org/10.48550/arxiv.2207.14810" @default.
- W4289446078 hasPublicationYear "2022" @default.
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