--- title: "Individual trapped-ion addressing with adjoint-optimized multimode photonic circuits" url: https://daily.dev/posts/individual-trapped-ion-addressing-with-adjoint-optimized-multimode-photonic-circuits-mpgzuaqa9 source_url: https://www.nature.com/articles/s44310-025-00102-4 type: article source: "Nature" published: 2026-01-27T05:13:09.102Z updated: 2026-01-27T05:13:34.541Z tags: ["quantum-computing"] reading_time: 44 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Individual trapped-ion addressing with adjoint-optimized multimode photonic circuits **[Nature](https://daily.dev/sources/nature)** · 44 min read · 0 upvotes · 0 comments ## Summary Researchers propose an integrated photonic circuit design for trapped-ion quantum computing that uses adjoint-optimized multimode grating couplers to individually address calcium ions. The design achieves diffraction-limited focusing with beam waists of 4.3 μm and 2.2 μm, and controlled interference of TE00 and TE10 modes enables ion addressing with crosstalk suppression between -20 dB and -60 dB at ion separations of 5-8 μm. The compact photonic platform offers a scalable alternative to free-space optics for precise qubit manipulation in large-scale trapped-ion systems. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#quantum-computing](https://daily.dev/tags/quantum-computing) [View this post on daily.dev](https://daily.dev/posts/individual-trapped-ion-addressing-with-adjoint-optimized-multimode-photonic-circuits-mpgzuaqa9)