Redundant string symmetry-based error correction: Demonstrations on quantum devices
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910547478315008 |
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| author | Qin, Zhangjie Azses, Daniel Sela, Eran Raussendorf, Robert Scarola, V. W. |
| author_facet | Qin, Zhangjie Azses, Daniel Sela, Eran Raussendorf, Robert Scarola, V. W. |
| contents | Computational power in measurement-based quantum computing stems from the symmetry-protected topological (SPT) order of entangled resource states. However, resource states are prone to preparation errors. We introduce a quantum error correction approach using redundant nonlocal symmetry of the resource state. We demonstrate it within a teleportation protocol based on extending the $\mathbb{Z}_2 \times \mathbb{Z}_2$ symmetry of one-dimensional cluster states to other graph states. Qubit ZZ-crosstalk errors, which are prominent in quantum devices, degrade the teleportation fidelity of the usual cluster state. However, as we demonstrate on quantum hardware, once we grow graph states with redundant symmetry, perfect teleportation fidelity is restored. We identify the underlying redundant-SPT order as error-protected degeneracies in the entanglement spectrum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_12854 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Redundant string symmetry-based error correction: Demonstrations on quantum devices Qin, Zhangjie Azses, Daniel Sela, Eran Raussendorf, Robert Scarola, V. W. Quantum Physics Strongly Correlated Electrons Computational power in measurement-based quantum computing stems from the symmetry-protected topological (SPT) order of entangled resource states. However, resource states are prone to preparation errors. We introduce a quantum error correction approach using redundant nonlocal symmetry of the resource state. We demonstrate it within a teleportation protocol based on extending the $\mathbb{Z}_2 \times \mathbb{Z}_2$ symmetry of one-dimensional cluster states to other graph states. Qubit ZZ-crosstalk errors, which are prominent in quantum devices, degrade the teleportation fidelity of the usual cluster state. However, as we demonstrate on quantum hardware, once we grow graph states with redundant symmetry, perfect teleportation fidelity is restored. We identify the underlying redundant-SPT order as error-protected degeneracies in the entanglement spectrum. |
| title | Redundant string symmetry-based error correction: Demonstrations on quantum devices |
| topic | Quantum Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.12854 |