Remote entanglement need not be the bottleneck for modular trapped-ion quantum computing

• URL: http://arxiv.org/abs/2607.18387v1
• Date: Mon, 20 Jul 2026 18:00:03 GMT
• Title: Remote entanglement need not be the bottleneck for modular trapped-ion quantum computing
• Abstract summary: Trapped ions hold the best photonic links, yet they rely on bulky optics to cap performance orders.<n>We show how single-photon detection leads to linear probabilitying, allowing compact integrated photonics.<n>We will address entanglement at a local limit in dense, easy-to-parallelize channels.
• Score: 2.4030726909042492
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Modularity underpins classical computing; as quantum processors encounter limits on fabrication yield, reliability, and size, they will need it just as acutely. The bottleneck to linking modules is producing shared entanglement at sufficient rate, density, and fidelity. Trapped ions hold the best demonstrated photonic links, yet they rely on bulky collection optics that cap how densely links can be packed, and their performance trails local gates by two orders of magnitude in rate and fidelity. We synthesize several enabling results $\unicode{x2014}$ single-photon heralding, coherent recoil correction, projective distillation, and trap-integrated photonics $\unicode{x2014}$ into one comprehensive architecture that substantially narrows this gap. Single-photon heralding leads to linear scaling of success probability with detection efficiency, allowing compact integrated photonics to saturate the entanglement rate at a local-operation limit in dense, easy-to-parallelize channels. Addressing its inherent error mechanisms at their source, we project a Bell-pair fidelity of 99.9\% at rates and densities compatible with fault-tolerant operations. Remote entanglement then need not remain the bottleneck for modular trapped-ion computing; the limit shifts to the local operations that must improve regardless.

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