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quant-ph2026
Locally Acting Grover Mixers for Constraint-Preserving QAOA
Minjin Choi, Dongkeun Lee, Junghee Ryu
The Grover mixer quantum alternating operator ansatz (GM-QAOA) employs the Grover mixer to confine the quantum evolution to the feasible subspace defined by the problem. Its mixing…
quant-ph2025
A variational quantum eigensolver tailored to multi-band tight-binding simulations of electronic structures
Dongkeun Lee, Hoon Ryu
We propose a cost-efficient measurement scheme of the variational quantum eigensolver (VQE) for atomistic simulations of electronic structures based on a tight-binding (TB) theory.…
quant-ph2024
Sampling Error Analysis in Quantum Krylov Subspace Diagonalization
Gwonhak Lee, Dongkeun Lee, Joonsuk Huh
Quantum Krylov subspace diagonalization (QKSD) is an emerging method used in place of quantum phase estimation in the early fault-tolerant era, where limited quantum circuit depth…