Author

B'alint Koczor

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Preprint Aug 2026

Eigenstate Preparation Through Near-Optimal Eigenprobability Filtering

Quantum simulation is expected to be a main application of quantum computers with realistic utility in quantum chemistry, materials science and beyond. However, preparing excited or general eigenstates is a central challenge, particularly when the desired eigenvalue is not known in advance, or when the overlap with the...

Po-Wei Huang, Bence Bak'o, B'alint Koczor · 0 citations

Preprint Aug 2026

Nearly Optimal Amplitude Estimation at any Depth

We develop a class of amplitude estimation algorithms with tunable circuit depth $M$ and circuit repetitions $N$, requiring neither ancilla qubits nor controlled Grover operations. For additive error $\epsilon$ in the Grover angle, they attain the nearly optimal query-depth tradeoff $M^2N\in\widetilde{O}(\epsilon^{-2})...

Jona Erle, B'alint Koczor · 1 citation · ⚡1