Robust and High-Fidelity Controlled Two-Qubit Gates via Asymmetric Parallel Resonant Excitation

• URL: http://arxiv.org/abs/2604.07163v1
• Date: Wed, 08 Apr 2026 14:54:01 GMT
• Title: Robust and High-Fidelity Controlled Two-Qubit Gates via Asymmetric Parallel Resonant Excitation
• Abstract summary: We propose a robust resonant scheme for arbitrary controlled two-qubit gates.<n>We show gate fidelities exceeding 99% within a 170 kHz detuning range with off-resonant excitation below 0.2%.
• Score: 13.730481430366682
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Implementing high-fidelity controlled two-qubit gates in dipole-dipole interacting systems, such as rare-earth-ion crystals, in hindered by spectral inhomogeneity and weak coupling. Existing method often rely on detuned pulses, making them susceptible to frequency errors and AC Stark shifts. We propose a robust resonant scheme for arbitrary controlled two-qubit gates that utilizes asymmetric excitation and pulse engineering to achieve decoupled, parallel qubit control. Simulations on rare-earth-ion ensemble qubits demonstrate gate fidelities exceeding 99% within a 170 kHz detuning range with off-resonant excitation below 0.2%. This approach offers a robust, scalable route for quantum computing in spectrally crowded systems.

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