Neutral-atom quantum computation using multi-qubit geometric gates via adiabatic passage

• URL: http://arxiv.org/abs/2511.04359v1
• Date: Thu, 06 Nov 2025 13:41:37 GMT
• Title: Neutral-atom quantum computation using multi-qubit geometric gates via adiabatic passage
• Authors: Sinchan Snigdha Rej, Bimalendu Deb,
• Abstract summary: We theoretically demonstrate two- and multi-qubit phase gates in a neutral atom architecture.<n>No extra laser is required to be applied on the target atom while scaling up the system from two- to multi-qubit quantum gates.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Adiabatic geometric phase gates offer enhanced robustness against fluctuations compared to con- ventional Rydberg blockade-based phase gates that rely on dynamical phase accumulation. We theoretically demonstrate two- and multi-qubit phase gates in a neutral atom architecture, relying on a double stimulated Raman adiabatic passage (double-STIRAP) pulse sequence that imprints a controllable geometric phase on the qubit systems. The system is designed in such a way that every atom is individually addressable, and moreover, no extra laser is required to be applied on the target atom while scaling up the system from two- to multi-qubit quantum gates. The gate fidelity has been numerically analyzed by changing the gate operation time, and we find that 98% to 99% fidelity can be achieved for gate time $\simeq$ 0.6 $\mu$s. We perform a systematic error analysis, which re- veals that our proposed gates can exhibit strong resilience against fluctuations in Rabi frequencies, finite blockade strength, and atomic position variations. These results establish our approach as a physically feasible and scalable pathway toward fault-tolerant quantum computation with neutral atoms. We simulate Grover's search algorithm for two-, three-, and four-qubit systems with high success probability and thereby demonstrate the utility and scalability of our proposed gates for quantum computation.

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