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

C. Piltz, T. Sriarunothai, A.F. Varón and C. Wunderlich ()
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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

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5679

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