Cryogenic trapped-ion system for long ion chain quantum computing and simulation

A trapped-ion system with a long ion chain is a promising architecture for scalable quantum computing and simulation [1]. We present a cryogenic trapped-ion system with versatile features for long ion chain experiments. The system employs a microfabricated surface trap (Sandia Peregrine) operating at cryogenic temperatures, resulting in a low motional heating rate (< 10/s). For state detection of long ion chains, we utilize a qCMOS camera-based imaging system (Hamamatsu ORCA-Quest 2). We implement an acousto-optic-deflector (AOD) based individual addressing system to drive quantum logic gates with Raman transitions with low optical crosstalk (< 9 * 10^-4), broad beam steering range (> 30 qubits), and fast beam switching time (~240 ns) [2]. We demonstrate individual addressing of a 30-ion chain using the AOD system. Electromagnetically induced transparency (EIT) cooling enables simultaneous cooling of multiple motional modes of a long ion chain [3]. This system offers a promising platform for quantum simulation of spin-boson or bosonic systems with a long ion chain.

[1] Lin, G-D., et al. "Large-scale quantum computation in an anharmonic linear ion trap." Europhysics Letters 86.6 (2009): 60004.

[2] Yu, Jiyong, et al. "Design and Characterization of Compact Acousto-Optic-Deflector Individual Addressing System for Trapped-Ion Quantum Computing." arXiv preprint arXiv:2601.01647 (2026).

[3] Feng, L., et al. "Efficient ground-state cooling of large trapped-ion chains with an electromagnetically-induced-transparency tripod scheme." Physical review letters 125.5 (2020): 053001.