A high-fidelity quantum matter-link between ion-trap microchip modules

M. Akhtar, F. Bonus, F. R. Lebrun-Gallagher, N. I. Johnson, M. Siegele-Brown, S. Hong, S. J. Hile, S. A. Kulmiya, S. Weidt and W. K. Hensinger ()
Additional contact information
M. Akhtar: University of Sussex
F. Bonus: Universal Quantum Ltd
F. R. Lebrun-Gallagher: University of Sussex
N. I. Johnson: University of Sussex
M. Siegele-Brown: University of Sussex
S. Hong: University of Sussex
S. J. Hile: University of Sussex
S. A. Kulmiya: University of Sussex
S. Weidt: University of Sussex
W. K. Hensinger: University of Sussex

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract System scalability is fundamental for large-scale quantum computers (QCs) and is being pursued over a variety of hardware platforms. For QCs based on trapped ions, architectures such as the quantum charge-coupled device (QCCD) are used to scale the number of qubits on a single device. However, the number of ions that can be hosted on a single quantum computing module is limited by the size of the chip being used. Therefore, a modular approach is of critical importance and requires quantum connections between individual modules. Here, we present the demonstration of a quantum matter-link in which ion qubits are transferred between adjacent QC modules. Ion transport between adjacent modules is realised at a rate of 2424 s−1 and with an infidelity associated with ion loss during transport below 7 × 10−8. Furthermore, we show that the link does not measurably impact the phase coherence of the qubit. The quantum matter-link constitutes a practical mechanism for the interconnection of QCCD devices. Our work will facilitate the implementation of modular QCs capable of fault-tolerant utility-scale quantum computation.

Date: 2023
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DOI: 10.1038/s41467-022-35285-3

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