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

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.

Quantum Physics (quant-ph); Disordered Systems and Neural Networks (cond-mat.dis-nn)

arXiv:2606.03380 [quant-ph]

(or arXiv:2606.03380v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2606.03380 Focus to learn more arXiv-issued DOI via DataCite

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