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Rapid exchange cooling with trapped ions

Author

Listed:
  • Spencer D. Fallek

    (Georgia Tech Research Institute)

  • Vikram S. Sandhu

    (Georgia Tech Research Institute)

  • Ryan A. McGill

    (Georgia Tech Research Institute)

  • John M. Gray

    (Georgia Tech Research Institute)

  • Holly N. Tinkey

    (Georgia Tech Research Institute)

  • Craig R. Clark

    (Georgia Tech Research Institute)

  • Kenton R. Brown

    (Georgia Tech Research Institute)

Abstract

The trapped-ion quantum charge-coupled device (QCCD) architecture is a leading candidate for advanced quantum information processing. In current QCCD implementations, imperfect ion transport and anomalous heating can excite ion motion during a calculation. To counteract this, intermediate cooling is necessary to maintain high-fidelity gate performance. Cooling the computational ions sympathetically with ions of another species, a commonly employed strategy, creates a significant runtime bottleneck. Here, we demonstrate a different approach we call exchange cooling. Unlike sympathetic cooling, exchange cooling does not require trapping two different atomic species. The protocol introduces a bank of “coolant" ions which are repeatedly laser cooled. A computational ion can then be cooled by transporting a coolant ion into its proximity. We test this concept experimentally with two 40Ca+ ions, executing the necessary transport in 107 μs, an order of magnitude faster than typical sympathetic cooling durations. We remove over 96%, and as many as 102(5) quanta, of axial motional energy from the computational ion. We verify that re-cooling the coolant ion does not decohere the computational ion. This approach validates the feasibility of a single-species QCCD processor, capable of fast quantum simulation and computation.

Suggested Citation

  • Spencer D. Fallek & Vikram S. Sandhu & Ryan A. McGill & John M. Gray & Holly N. Tinkey & Craig R. Clark & Kenton R. Brown, 2024. "Rapid exchange cooling with trapped ions," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45232-z
    DOI: 10.1038/s41467-024-45232-z
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