Multi-zone trapped-ion qubit control in an integrated photonics QCCD device

Multi-zone trapped-ion qubit control in an integrated photonics QCCD device

February 27, 2024 | Carmelo Mordini,1,1, Alfredo Ricci Vasquez,1,1, Yuto Motohashi,1, Mose Müller,1 Maciej Malinowski,1 Chi Zhang,1 Karan K. Mehta,1,1, Daniel Kienzler,1 and Jonathan P. Home1,2, §
This paper demonstrates the implementation of multiplexed operations and extended coherent control over multiple trapping sites in a trapped-ion processor using an integrated photonics Quantum Charge-Coupled Device (QCCD) architecture. The authors achieve this by employing a surface electrode trap with integrated photonic components, which can be scaled to larger numbers of zones. Key achievements include: 1. **Transport and Coherent Operations**: The team performed a Ramsey sequence using integrated light in two zones separated by 375 μm, transporting an ion between the zones in 200 μs. They developed techniques to mitigate the effects of exposed dielectric surfaces, which can cause motional excitation during transport. 2. **Simultaneous Control of Two Ions**: They demonstrated simultaneous control of two ions in separate zones with low optical crosstalk, allowing for simultaneous spectroscopy to correlate field noise between the two sites. 3. **Transport and Coherence**: The work includes detailed descriptions of the multi-zone trap design, transport protocols, and calibration routines to compensate for the effects of exposed light delivery windows. They also performed a Ramsey experiment to demonstrate coherence between multiple zones. 4. **Independent Control of Electric Fields**: The authors achieved independent control of the electric fields in each trap zone, enabling precise positioning of ions to a few nanometers of precision. 5. **Light Delivery and Integration**: The integrated photonic components, including waveguides and grating couplers, were used to deliver light to the trapping zones, facilitating compact routing and focused illumination. 6. **Outlook and Future Work**: The paper discusses potential improvements, such as reducing motional excitation after transport and integrating UV light delivery. It also highlights the importance of compensating for laser phase drifts and using spectator ions for continuous calibration and stabilization of the magnetic field. This research lays the foundation for further scaling and integration in trapped-ion QCCD architectures, with potential applications in quantum computing and metrology.This paper demonstrates the implementation of multiplexed operations and extended coherent control over multiple trapping sites in a trapped-ion processor using an integrated photonics Quantum Charge-Coupled Device (QCCD) architecture. The authors achieve this by employing a surface electrode trap with integrated photonic components, which can be scaled to larger numbers of zones. Key achievements include: 1. **Transport and Coherent Operations**: The team performed a Ramsey sequence using integrated light in two zones separated by 375 μm, transporting an ion between the zones in 200 μs. They developed techniques to mitigate the effects of exposed dielectric surfaces, which can cause motional excitation during transport. 2. **Simultaneous Control of Two Ions**: They demonstrated simultaneous control of two ions in separate zones with low optical crosstalk, allowing for simultaneous spectroscopy to correlate field noise between the two sites. 3. **Transport and Coherence**: The work includes detailed descriptions of the multi-zone trap design, transport protocols, and calibration routines to compensate for the effects of exposed light delivery windows. They also performed a Ramsey experiment to demonstrate coherence between multiple zones. 4. **Independent Control of Electric Fields**: The authors achieved independent control of the electric fields in each trap zone, enabling precise positioning of ions to a few nanometers of precision. 5. **Light Delivery and Integration**: The integrated photonic components, including waveguides and grating couplers, were used to deliver light to the trapping zones, facilitating compact routing and focused illumination. 6. **Outlook and Future Work**: The paper discusses potential improvements, such as reducing motional excitation after transport and integrating UV light delivery. It also highlights the importance of compensating for laser phase drifts and using spectator ions for continuous calibration and stabilization of the magnetic field. This research lays the foundation for further scaling and integration in trapped-ion QCCD architectures, with potential applications in quantum computing and metrology.
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