Scalable Trapped Ion Addressing with Adjoint-optimized Multimode Photonic Circuits

TL;DR

This paper introduces a scalable integrated photonic circuit design for precise, reconfigurable ion addressing in trapped-ion quantum computing, enhancing stability and scalability over traditional free-space optics.

Contribution

It presents a novel multimode photonic circuit integrated with a surface-electrode ion trap, enabling targeted light delivery to multiple ions with low crosstalk and potential for quantum gate applications.

Findings

Achieves diffraction-limited focusing with 4.3 μm and 2.2 μm beam waists.

Demonstrates crosstalk of -20 to -30 dB for individual ion addressing.

Higher-order modes enable new spin-motion coupling mechanisms.

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.