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A trapped-ion-based quantum byte with 10−5 next-neighbour cross-talk

Author

Listed:
  • C. Piltz

    (Naturwissenschaftlich-Technische Fakultät, Universität Siegen)

  • T. Sriarunothai

    (Naturwissenschaftlich-Technische Fakultät, Universität Siegen)

  • A.F. Varón

    (Naturwissenschaftlich-Technische Fakultät, Universität Siegen)

  • C. Wunderlich

    (Naturwissenschaftlich-Technische Fakultät, Universität Siegen)

Abstract

The addressing of a particular qubit within a quantum register is a key pre-requisite for scalable quantum computing. In general, executing a quantum gate with a single qubit, or a subset of qubits, affects the quantum states of all other qubits. This reduced fidelity of the whole-quantum register could prevent the application of quantum error correction protocols and thus preclude scalability. Here we demonstrate addressing of individual qubits within a quantum byte (eight qubits) and measure the error induced in all non-addressed qubits (cross-talk) associated with the application of single-qubit gates. The quantum byte is implemented using microwave-driven hyperfine qubits of 171Yb+ ions confined in a Paul trap augmented with a magnetic gradient field. The measured cross-talk is on the order of 10−5 and therefore below the threshold commonly agreed sufficient to efficiently realize fault-tolerant quantum computing. Hence, our results demonstrate how this threshold can be overcome with respect to cross-talk.

Suggested Citation

  • C. Piltz & T. Sriarunothai & A.F. Varón & C. Wunderlich, 2014. "A trapped-ion-based quantum byte with 10−5 next-neighbour cross-talk," Nature Communications, Nature, vol. 5(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5679
    DOI: 10.1038/ncomms5679
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