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  • Featured in Physics
  • Open Access

Multizone Trapped-Ion Qubit Control in an Integrated Photonics QCCD Device

Carmelo Mordini1,*,†,∥, Alfredo Ricci Vasquez1,†, Yuto Motohashi1, Mose Müller1, Maciej Malinowski1, Chi Zhang1, Karan K. Mehta1,‡, Daniel Kienzler1, and Jonathan P. Home1,2,§

  • 1Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland
  • 2Quantum Center, ETH Zürich, 8093 Zürich, Switzerland

  • *Contact author: cmordini@phys.ethz.ch
  • †These authors contributed equally to this work.
  • ‡Present address: School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA.
  • §Contact author: jhome@ethz.ch
  • ∥Present address: Dipartimento di Fisica e Astronomia “G. Galilei”, Università degli Studi di Padova, I-35131 Padova, Italy.
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Phys. Rev. X 15, 011040 – Published 24 February, 2025

DOI: https://doi.org/10.1103/PhysRevX.15.011040

Abstract

Multiplexed operations and extended coherent control over multiple trapping sites are fundamental requirements for a trapped-ion processor in a large-scale architecture. Here, we demonstrate these building blocks using a surface-electrode trap with integrated photonic components which are scalable to larger numbers of zones. We implement a Ramsey sequence using the integrated light in two zones, separated by 375  μm, performing transport of the ion from one zone to the other in 200  μs between pulses. In order to achieve low motional excitation during transport, we develop techniques to measure and mitigate the effect of the exposed dielectric surfaces used to deliver the integrated light to the ion. We also demonstrate simultaneous control of two ions in separate zones with low optical crosstalk and use this to perform simultaneous spectroscopy to correlate field noise between the two sites. Our work demonstrates the first transport and coherent multizone operations in integrated photonic ion trap systems, forming the basis for further scaling in the trapped-ion quantum charge-coupled device architecture.

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Physics Subject Headings (PhySH)

Viewpoint

A Path to Scalable Quantum Computers

Published 24 February, 2025

The demonstration that ions can be precisely manipulated in a trap containing integrated photonics paves the way for a large-scale trapped-ion quantum processor.

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Popular Summary

A key ingredient for scaling quantum processors based on trapped ions is the ability to multiplex operations, controlling several zones of the trap at the same time and moving ions to transfer quantum information between them. In this study, we do this using a surface-electrode ion trap with built-in photonic components. These allow light to be delivered directly to the ions from multiple places in the trap, making the system scalable.

The presence of extra elements on the trap surface coming from the photonic structures can disturb ion motion during transport and can be detrimental for quantum operations. We tackle this problem by developing techniques to mitigate the impact of the exposed photonic surfaces, compensating for their effect in each of the interested zones and in between during ion transport.

We then demonstrate two types of multizone operations. First, we perform coherent quantum operations by transporting a single ion between two zones while using the integrated photonics to control its quantum state. Second, we show simultaneous control of two ions, one in each zone, with very little interference between them. This includes using spectroscopy to measure and compare noise between the two zones.

This work is the first demonstration of ion transport and coherent operations in a multizone trap with integrated photonics. These advances bring us closer to building larger, more capable trapped-ion quantum processors in the quantum-charge-coupled-device architecture, enabling more complex computations and better error correction methods in the future.

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Phys. Rev. X 15, 011040– Published 24 February, 2025
  • Received 23 February 2024
  • Revised 31 October 2024
  • Accepted 20 December 2024
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