3 papers
quant-ph2026
Composite quantum gates simultaneously compensated for multiple errors
Hristo G. Tonchev, Nikolay V. Vitanov
Systematic control errors remain a primary obstacle to realizing high-fidelity single-qubit gates. We introduce composite pulse sequences that implement X and Hadamard gates while…
quant-ph2025
Grover's search with an oracle distinguishing between solutions
Hristo Tonchev, Rosen Bahtev
Here we suggest a modification of Grover's algorithm, based on a multiphase oracle which marks each solution with a different phase when there is more than one solution. Such a mod…
quant-ph2025
Robust, fast and high-fidelity composite single-qubit gates for superconducting transmon qubits
Hristo G. Tonchev, Boyan T. Torosov, Nikolay V. Vitanov
We introduce a novel quantum control method for superconducting transmon qubits that substantially outperforms conventional techniques in precision and robustness against coherent…