林海onrush
(2025-07-31 23:19):
#paper, 《Efficient Qudit Circuit for Quench Dynamics of 2+1D Quantum Link Electrodynamics》,10.48550/arXiv.2507.12589 ,
本研究提出了一种基于多能级量子比特(qudit)的高效量子电路框架,用于模拟2+1维U(1)格点规范电动力学的淬灭动力学。通过利用高斯定律积分出物质场,仅保留规范自由度,作者构建了无需辅助qubit的紧凑电路设计,并通过数值模拟验证其在现实噪声下仍能保持高度相干的动态演化表现。
该方法不仅大幅降低了量子资源消耗,还适用于任意自旋表示和更高维度格点系统,具备良好的可扩展性。相比传统qubit编码,qudit实现更贴近硬件特性,适用于当前和近期的量子处理器,为模拟高能物理非平衡现象提供了一条切实可行的量子计算路径。
arXiv,
2025-07-16T19:16:49Z.
DOI: 10.48550/arXiv.2507.12589
Efficient Qudit Circuit for Quench Dynamics of $2+1$D Quantum Link Electrodynamics
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Abstract:
A major challenge in the burgeoning field of quantum simulation forhigh-energy physics is the realization of scalable $2+1$D lattice gaugetheories on state-of-the-art quantum hardware, which is an essential steptowards the overarching goal of probing $3+1$D quantum chromodynamics on aquantum computer. Despite great progress, current experimental implementationsof $2+1$D lattice gauge theories are mostly restricted to relatively smallsystem sizes and two-level representations of the gauge and electric fields.Here, we propose a resource-efficient method for quantum simulating $2+1$Dspin-$S$ $\mathrm{U}(1)$ quantum link lattice gauge theories with dynamicalmatter using qudit-based quantum processors. By integrating out the matterfields through Gauss's law, we reformulate the quantum link model in a purelyspin picture compatible with qudit encoding across arbitrary spatialdimensions, eliminating the need for ancillary qubits and reducing resourceoverhead. Focusing first on the spin-$1/2$ case, we construct explicit circuitsfor the full Hamiltonian and demonstrate through numerical simulations that thefirst-order Trotterized circuits accurately capture the quench dynamics even inthe presence of realistic noise levels. Additionally, we introduce a generalmethod for constructing coupling-term circuits for higher-spin representations$S>1/2$. Compared to conventional qubit encodings, our framework significantlyreduces the number of quantum resources and gate count. Our approachsignificantly enhances scalability and fidelity for probing nonequilibriumphenomena in higher-dimensional lattice gauge theories, and is readily amenableto implementation on state-of-the-art qudit platforms.
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