Scalable Trapped Ion Addressing with Adjoint-optimized Multimode Photonic Circuits

• URL: http://arxiv.org/abs/2505.08997v1
• Date: Tue, 13 May 2025 22:20:45 GMT
• Title: Scalable Trapped Ion Addressing with Adjoint-optimized Multimode Photonic Circuits
• Authors: Melika Momenzadeh, Ke Sun, Qiming Wu, Bingran You, Yu-Lung Tang, Hartmut Häffner, Maxim Radikovich Shcherbakov,
• Abstract summary: Integrated photonics offers a promising alternative to conventional free-space optics.<n>We propose a design for a multimode photonic circuit integrated with a surface-electrode ion trap.<n> Controlled interference of the TE$_text10$ and TE$_text20$ modes results in crosstalk of -20 dB to -30 dB at ion separations.
• Score: 1.5892079842086992
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Trapped-ion quantum computing requires precise optical control for individual qubit manipulation. However, conventional free-space optics face challenges in alignment stability and scalability as the number of qubits increases. Integrated photonics offers a promising alternative, providing miniaturized optical systems on a chip. Here, we propose a design for a multimode photonic circuit integrated with a surface-electrode ion trap capable of targeted and reconfigurable light delivery. Three closely positioned ions can be addressed using a focusing grating coupler that emits multimode light through electrode openings to ions trapped 80 $\mu$m above the chip. Simulations show that the couplers achieve diffraction-limited spot with a 4.3 $\mu$m beam waist along the trap axis and 2.2 $\mu$m perpendicular to the trap axis. Controlled interference of the TE$_{\text{10}}$ and TE$_{\text{20}}$ modes results in crosstalk of -20 dB to -30 dB at ion separations of 5-8 $\mu$m when addressing ions individually, and down to -60 dB when two of the three ions are addressed simultaneously. Additionally, the higher-order TE modes can offer a novel mechanism for driving spin-motion coupling transitions, potentially enabling alternative approaches to quantum gates and simulations. The proposed integrated platform offers a viable path for constructing large-scale trapped-ion systems, leveraging the benefits of nanophotonic design for precise and reliable ion manipulation.

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