Monolithic three-dimensional (3D) Paul traps combine the high-precision microfabrication of two-dimensional (2D) chip traps with the deep trapping potentials and low heating rates characteristic of macroscopic 3D Paul traps, which are typically machined by traditional means and mechanically assembled. However, achieving low motional heating rates and optical access with a high numerical aperture (NA) while maintaining the high radio-frequency (rf) voltages required for trapping heavy ionic species, such as ${\text{Yb}}^{+}$ and ${\text{Ba}}^{+}$, remains a significant technical challenge. In this work, we present a fused silica, monolithic segmented 3D Paul trap with an ion-electrode distance of $250\mathrm{\mu }\mathrm{m}$, and stable operation at high rf voltages. We benchmark the trap’s performance using ${\text{Yb}}^{+}$ ions, demonstrating axially homogeneous trapping potentials spanning over $200\mathrm{\mu }\mathrm{m}$ about the trap’s axial center, high multidirectional optical access (up to 0.7 NA), and radial motional heating as low as $\dot{\overline{n}}=1.1\pm 0.1\mathrm{quanta}/\mathrm{s}$ at radial trap frequencies about $3\mathrm{MHz}$ near room temperature. Furthermore, we observe a motional Ramsey coherence time, $T_2$, of about $96\mathrm{ms}$ for the radial center-of-mass mode. We demonstrate the generation of a two-qubit Bell state with a parity contrast of ${99.3}_{-1.5}^{+0.7}\%$ with state preparation and measurement correction. These results establish fused-silica monolithic 3D Paul traps as a scalable, modular platform for quantum simulation, computation, metrology, and networking with heavy ionic species.

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• Atom & ion cooling
• Atom & ion trapping & guiding
• Coherent control
• Quantum coherence & coherence measures
• Quantum information with trapped ions
• Trapped ions
• Cooling & trapping
• Radio frequency techniques