Comparison of trapped-ion entangling gate mechanisms for mixed species

2025/09/22 by Vera M. Schäfer, A. C. Hughes, Schäfer, V. M. +11
Computer Science · Materials Science · #Atomic Physics (physics.atom-ph) #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph)

paper · pdf · doi:10.48550/arxiv.2509.17893

openalex publication_date 2025/09/22 · openalex created_date 2025/10/17 · openalex updated_date 2026/07/28

Abstract

Entangling gates are an essential capability of quantum computers. There are different methods for implementing two-qubit gates, with respective advantages and disadvantages. We investigate the experimentally relevant differences and commonalities of laser-based σ_z⊗σ_z light-shift and σ_ϕ⊗σ_ϕ Moelmer-Soerensen gates, highlighting the phases of experimental control fields and their long-term stabilities, in the specific case of mixed-species gates. We implement these gates on qubits with very different magnetic field sensitivities, encoded in ⁴³Ca⁺ and ⁸⁸Sr⁺, achieving fidelities of 99.8% for the σ_z⊗σ_z and 99.6% for the σ_ϕ⊗σ_ϕ gate.

Citations

• Scalable, high-fidelity all-electronic control of trapped-ion qubits
• Distributed quantum computing across an optical network link
• Quantum science and metrology with mixed-species ion chains
• Experimental issues in coherent quantum-state manipulation of trapped atomic ions

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• Fast, robust and laser-free universal entangling gates for trapped-ion quantum computing
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• Efficient optical configurations for trapped-ion entangling gates
• Trapped-ion two-qubit gates with >99.99% fidelity without ground-state cooling