Chip scale coil stabilized Brillouin laser driving a room temperature trapped ion qubit.
basic_science · Level V
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- Record sourced from PubMed, PMID 41775705.
- Also identified by DOI 10.1038/s41467-026-69948-2.
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Abstract
Photonic integrated stable, ultra-low-noise lasers are essential for scalable and portable quantum information systems. Trapped ions are a leading modality for quantum computing and optical clocks, with room-temperature operation enabling portable applications. Current systems rely on free-space lasers and stabilization cavities, frequency conversion, and cryogenic infrastructure, limiting size, weight, and power. We demonstrate a chip-scale coil-stabilized 674 nm Brillouin laser driving qubit state preparation and measurement and the optical clock transition in a room-temperature surface electrode trapped <sup>88</sup>Sr<sup>+</sup> ion without a bulk-optic reference cavity. The CMOS compatible silicon nitride integrated 3-meter coil and Brillouin laser achieve 8.8×10<sup>-13</sup> stability at 20 ms, sufficient to interrogate the 0.4 Hz quadrupole optical clock transition. The ion-disciplined laser achieves 5.3 <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>-</mo><mn>13</mn></mrow></msup><mo>/</mo><msqrt><mrow><mi>τ</mi></mrow></msqrt></math> stability, spectroscopy with 1.5 kHz linewidths, and 99.6% qubit state preparation and measurement fidelity. These results light the way towards integration of stabilized lasers with trapped-ion chips for portable and robust quantum technologies.