This paper presents a demonstration of multi-zone trapped-ion qubit control in an integrated photonics QCCD device. The researchers implemented a Ramsey sequence using integrated light in two zones separated by 375 µm, performing transport of the ion between zones in 200 µs. They developed techniques to measure and mitigate the effect of exposed dielectric surfaces used to deliver the integrated light. They also demonstrated simultaneous control of two ions in separate zones with low optical crosstalk and performed simultaneous spectroscopy to correlate field noise between the two sites. The work demonstrates the first transport and coherent multi-zone operations in integrated photonic ion trap systems, forming the basis for further scaling in the trapped-ion QCCD architecture. The researchers developed a multi-zone trap with integrated photonics to deliver light to calcium ions, which can be trapped in multiple zones of the chip. They used a segmented surface electrode trap with integrated photonics to deliver light to calcium ions. The trap has three trapping zones, each equipped with one broad-output grating coupler emitting at 866 and 854 nm, and two tightly-focusing couplers fed by the same input waveguide which produces a passively phase-stable standing wave at 729 nm. Voltages applied to the segmented electrodes allow them to shuttle ions along the trap axis and precisely position them within the intensity pattern of the standing wave in each zone. The researchers used a heuristic model to compensate for discrepancies between the predicted and actual potential, which was based on the electrical response of the other layers of the trap chip underneath the electrodes. They also used Doppler velocimetry to quantify the effectiveness of their stray field compensation method. They demonstrated transport of an ion between zones using a waveform with a total duration of about 1 ms, before and after including the couplers in the model. They measured the motional excitation along the transport trajectory after including the compensation and found that the motional excitation was significantly reduced. The researchers performed a Ramsey experiment across the two trap zones separated by 375 µm, demonstrating multi-zone coherent operations. They used a 729 nm laser pulse to prepare a superposition state in the optical qubit and then transported the ion to Zone 2 where they completed the Ramsey sequence with a second 729 nm pulse. They measured the population in the |↓⟩ state as a function of the phase of the second π/2-pulse and found that the Ramsey sequence could still be closed with high contrast. They also benchmarked the quality of the π-pulses by applying two consecutive pulses in the optical qubit and found that the fidelity was significantly improved using composite BB1 π-pulses. The researchers demonstrated parallel control of the optical qubit |↓↓⟩→|1⟩ of two ⁴⁰Ca⁺ ions each sitting in a different zone of the trap by driving simultaneous Rabi oscillations on the two qubits.This paper presents a demonstration of multi-zone trapped-ion qubit control in an integrated photonics QCCD device. The researchers implemented a Ramsey sequence using integrated light in two zones separated by 375 µm, performing transport of the ion between zones in 200 µs. They developed techniques to measure and mitigate the effect of exposed dielectric surfaces used to deliver the integrated light. They also demonstrated simultaneous control of two ions in separate zones with low optical crosstalk and performed simultaneous spectroscopy to correlate field noise between the two sites. The work demonstrates the first transport and coherent multi-zone operations in integrated photonic ion trap systems, forming the basis for further scaling in the trapped-ion QCCD architecture. The researchers developed a multi-zone trap with integrated photonics to deliver light to calcium ions, which can be trapped in multiple zones of the chip. They used a segmented surface electrode trap with integrated photonics to deliver light to calcium ions. The trap has three trapping zones, each equipped with one broad-output grating coupler emitting at 866 and 854 nm, and two tightly-focusing couplers fed by the same input waveguide which produces a passively phase-stable standing wave at 729 nm. Voltages applied to the segmented electrodes allow them to shuttle ions along the trap axis and precisely position them within the intensity pattern of the standing wave in each zone. The researchers used a heuristic model to compensate for discrepancies between the predicted and actual potential, which was based on the electrical response of the other layers of the trap chip underneath the electrodes. They also used Doppler velocimetry to quantify the effectiveness of their stray field compensation method. They demonstrated transport of an ion between zones using a waveform with a total duration of about 1 ms, before and after including the couplers in the model. They measured the motional excitation along the transport trajectory after including the compensation and found that the motional excitation was significantly reduced. The researchers performed a Ramsey experiment across the two trap zones separated by 375 µm, demonstrating multi-zone coherent operations. They used a 729 nm laser pulse to prepare a superposition state in the optical qubit and then transported the ion to Zone 2 where they completed the Ramsey sequence with a second 729 nm pulse. They measured the population in the |↓⟩ state as a function of the phase of the second π/2-pulse and found that the Ramsey sequence could still be closed with high contrast. They also benchmarked the quality of the π-pulses by applying two consecutive pulses in the optical qubit and found that the fidelity was significantly improved using composite BB1 π-pulses. The researchers demonstrated parallel control of the optical qubit |↓↓⟩→|1⟩ of two ⁴⁰Ca⁺ ions each sitting in a different zone of the trap by driving simultaneous Rabi oscillations on the two qubits.