High-fidelity two-qubit quantum logic gates in a trapped-ion chain using axial motional modes

• URL: http://arxiv.org/abs/2507.00504v1
• Date: Tue, 01 Jul 2025 07:18:06 GMT
• Title: High-fidelity two-qubit quantum logic gates in a trapped-ion chain using axial motional modes
• Authors: Xingyu Zhao, Ji Bian, Yi Li, Yue Li, Mengxiang Zhang, Yiheng Lin,
• Abstract summary: A promising approach is to build high-performance modules interconnected via strong coupling.<n>We demonstrate two-qubit quantum logic gates in a 5-ion $40$Ca$+$ chain using axial modes.
• Score: 11.528038579022027
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Trapped-ion systems are one of the leading platforms for quantum information processing, where a key challenge is to scale up system size while maintaining high-fidelity two-qubit operations. A promising approach is to build high-performance modules interconnected via strong coupling. In particular, axial motional modes provide a feasible means of coupling short ion chains. However, previous implementations of fully connected 5-ion modules based on axial modes have been limited to fidelities of $96.6-98.0\%$. Here, we demonstrate two-qubit quantum logic gates in a 5-ion $^{40}$Ca$^{+}$ chain using axial modes, achieving fidelities exceeding $99\%$ for adjacent pairs and over $98\%$ for arbitrary pairs by carefully tackling dominant error sources. Our results are beneficial to the development of scalable ion-trap quantum processors, quantum simulation and quantum-enhanced metrology.

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