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Computational multiqubit tunnelling in programmable quantum annealers

Open access
Boixo, Sergio, Smelyanskiy, Vadim N., Shabani, Alireza, Isakov, Sergei V., Dykman, Mark, Denchev, Vasil S., Amin, Mohammad H., Smirnov, Anatoly Yu, Mohseni, Masoud, Neven, Hartmut·2016·Nature Communications

Abstract

Quantum tunnelling is a phenomenon in which a quantum state traverses energy barriers higher than the energy of the state itself. Quantum tunnelling has been hypothesized as an advantageous physical resource for optimization in quantum annealing. However, computational multiqubit tunnelling has not yet been observed, and a theory of co-tunnelling under high- and low-frequency noises is lacking. Here we show that 8-qubit tunnelling plays a computational role in a currently available programmable quantum annealer. We devise a probe for tunnelling, a computational primitive where classical paths are trapped in a false minimum. In support of the design of quantum annealers we develop a nonperturbative theory of open quantum dynamics under realistic noise characteristics. This theory accurately predicts the rate of many-body dissipative quantum tunnelling subject to the polaron effect. Furthermore, we experimentally demonstrate that quantum tunnelling outperforms thermal hopping along classical paths for problems with up to 200 qubits containing the computational primitive.

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Metadata

Authors
Boixo, S., Smelyanskiy, V. N., Shabani, A., Isakov, S. V., Dykman, M., Denchev, V. S., Amin, M. H., Smirnov, A. Y., Mohseni, M., & Neven, H.
Venue
Nature Communications
Published
2016-01-07
Volume
7
Issue
1
Pages
10327-10327
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2253909748
Cited by
233
References
9
FWCI
32.09
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Computational multiqubit tunnelling in programmable quantum annealers. https://app.cochat.ai/papers/10.1038/ncomms10327
The paper
Boixo, S., Smelyanskiy, V. N., Shabani, A., Isakov, S. V., Dykman, M., Denchev, V. S., Amin, M. H., Smirnov, A. Y., Mohseni, M., & Neven, H. (2016). Computational multiqubit tunnelling in programmable quantum annealers. Nature Communications. https://doi.org/10.1038/ncomms10327

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