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arXiv · 2606.03380

Spectral theory of energy-selective quantum search with Ising Hamiltonian phase oracles

A. S. Plyashechnik·A. A. Zhukov·A. V. Lebedev·W. V. Pogosov
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Abstract

We develop an exact spectral-response theory for the Grover-type iterate \(W_T=D_\xi\exp(-\ii T H)\), in which the evolution generated by a diagonal Ising Hamiltonian is used directly as a continuous phase oracle. An energy-grouped recurrence and its generating-function solution show how the empirical characteristic function determines the position, width, height, and saturation time of an energy-selective resonance. For an annealed Gaussian density of states, a high-density-tail resonance containing \(M\) configurations is reached after \(\Theta(\sqrt{2^n/M})\) oracle calls with success probability \(\Theta(1)\), giving a quadratic query improvement over independent uniform sampling with classical energy evaluation. For correlated random Ising spectra, overlap-dependent covariances lead to a realization-dependent resonance shift with root-mean-square scale \(O(n^{-3})\), parametrically larger than the resonance width, and can also reduce the peak height. The shift is both an algorithmic detuning and a coherent probe of sample-specific spectral fluctuations whose ensemble statistics reflect the Ising overlap structure. Spectral symmetrization and iterative calibration can remove or compensate the resonance-center displacement for prescribed-energy targeting. We also clarify the relation to designed spectral filters and the precision and coherence requirements of this asymptotic primitive.

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A. S. Plyashechnik, A. A. Zhukov, A. V. Lebedev, W. V. Pogosov. 2026-06-02. Spectral theory of energy-selective quantum search with Ising Hamiltonian phase oracles. https://arxiv.org/abs/2606.03380

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