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Experimental deterministic correction of qubit loss

Roman Stricker, Davide Vodola Orcid Logo, Alexander Erhard, Lukas Postler, Michael Meth, Martin Ringbauer, Philipp Schindler, Thomas Monz, Markus Muller, Rainer Blatt

Nature, Volume: 585, Issue: 7824, Pages: 207 - 210

Swansea University Authors: Davide Vodola Orcid Logo, Markus Muller

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DOI (Published version): 10.1038/s41586-020-2667-0

Abstract

The successful operation of quantum computers relies on protecting qubits from decoherence and noise which, if uncorrected, will lead to erroneous results. These errors accumulate during an algorithm and thus correcting them becomes a key requirement for large-scale and fault-tolerant quantum inform...

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Published in: Nature
ISSN: 0028-0836 1476-4687
Published: Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54649
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spelling 2020-12-02T15:22:31.3844484 v2 54649 2020-07-06 Experimental deterministic correction of qubit loss d00cf42047dd74f072891c2c8f37f32e 0000-0003-0880-3548 Davide Vodola Davide Vodola true false 9b2ac559af27c967ece69db08b83762a Markus Muller Markus Muller true false 2020-07-06 SPH The successful operation of quantum computers relies on protecting qubits from decoherence and noise which, if uncorrected, will lead to erroneous results. These errors accumulate during an algorithm and thus correcting them becomes a key requirement for large-scale and fault-tolerant quantum information processors. Besides computational errors, which can be addressed by quantum error correction, the carrier of the information can also be completely lost or the information can leak out of the computational space. It is expected that such loss errors will occur at rates that are comparable to computational errors. Here we experimentally implement a full cycle of qubit loss detection and correction on a minimal instance of a topological surface code in a trapped-ion quantum processor. The key technique for this correction is a quantum non-demolition measurement via an ancillary qubit, which acts as a minimally invasive probe to detect absent qubits while only imparting the minimal quantum-mechanically possible disturbance on the remaining qubits. Upon detecting qubit loss, a recovery procedure is triggered in real-time, which maps the logical information onto a new encoding on the remaining qubits. Although the current demonstration is performed in a trapped-ion quantum processor, the protocol is applicable to other quantum computing architectures and error correcting codes, including leading 2D and 3D topological codes. These methods provide a complete toolbox for the correction of qubit loss that complements techniques to mitigate computational errors, which together constitute the building blocks for complete and scalable quantum error correction. Journal Article Nature 585 7824 207 210 Springer Science and Business Media LLC 0028-0836 1476-4687 10 9 2020 2020-09-10 10.1038/s41586-020-2667-0 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-12-02T15:22:31.3844484 2020-07-06T11:38:35.0885421 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Roman Stricker 1 Davide Vodola 0000-0003-0880-3548 2 Alexander Erhard 3 Lukas Postler 4 Michael Meth 5 Martin Ringbauer 6 Philipp Schindler 7 Thomas Monz 8 Markus Muller 9 Rainer Blatt 10 54649__17646__7dc0d0935128415da478b73377d0a3df.pdf Qubit_loss_Nature_accepted.pdf 2020-07-06T11:47:16.3408967 Output 1466069 application/pdf Accepted Manuscript true 2021-03-09T00:00:00.0000000 true English
title Experimental deterministic correction of qubit loss
spellingShingle Experimental deterministic correction of qubit loss
Davide Vodola
Markus Muller
title_short Experimental deterministic correction of qubit loss
title_full Experimental deterministic correction of qubit loss
title_fullStr Experimental deterministic correction of qubit loss
title_full_unstemmed Experimental deterministic correction of qubit loss
title_sort Experimental deterministic correction of qubit loss
author_id_str_mv d00cf42047dd74f072891c2c8f37f32e
9b2ac559af27c967ece69db08b83762a
author_id_fullname_str_mv d00cf42047dd74f072891c2c8f37f32e_***_Davide Vodola
9b2ac559af27c967ece69db08b83762a_***_Markus Muller
author Davide Vodola
Markus Muller
author2 Roman Stricker
Davide Vodola
Alexander Erhard
Lukas Postler
Michael Meth
Martin Ringbauer
Philipp Schindler
Thomas Monz
Markus Muller
Rainer Blatt
format Journal article
container_title Nature
container_volume 585
container_issue 7824
container_start_page 207
publishDate 2020
institution Swansea University
issn 0028-0836
1476-4687
doi_str_mv 10.1038/s41586-020-2667-0
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
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description The successful operation of quantum computers relies on protecting qubits from decoherence and noise which, if uncorrected, will lead to erroneous results. These errors accumulate during an algorithm and thus correcting them becomes a key requirement for large-scale and fault-tolerant quantum information processors. Besides computational errors, which can be addressed by quantum error correction, the carrier of the information can also be completely lost or the information can leak out of the computational space. It is expected that such loss errors will occur at rates that are comparable to computational errors. Here we experimentally implement a full cycle of qubit loss detection and correction on a minimal instance of a topological surface code in a trapped-ion quantum processor. The key technique for this correction is a quantum non-demolition measurement via an ancillary qubit, which acts as a minimally invasive probe to detect absent qubits while only imparting the minimal quantum-mechanically possible disturbance on the remaining qubits. Upon detecting qubit loss, a recovery procedure is triggered in real-time, which maps the logical information onto a new encoding on the remaining qubits. Although the current demonstration is performed in a trapped-ion quantum processor, the protocol is applicable to other quantum computing architectures and error correcting codes, including leading 2D and 3D topological codes. These methods provide a complete toolbox for the correction of qubit loss that complements techniques to mitigate computational errors, which together constitute the building blocks for complete and scalable quantum error correction.
published_date 2020-09-10T04:08:18Z
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