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A decoherence-free subspace in a charge quadrupole qubit
Quantum computing promises significant speed-up for certain types of computational problems. However, robust implementations of semiconducting qubits must overcome the effects of charge noise that currently limit coherence during gate operations. Here we describe a scheme for protecting solid-state...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5490009/ https://www.ncbi.nlm.nih.gov/pubmed/28643778 http://dx.doi.org/10.1038/ncomms15923 |
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author | Friesen, Mark Ghosh, Joydip Eriksson, M. A. Coppersmith, S. N. |
author_facet | Friesen, Mark Ghosh, Joydip Eriksson, M. A. Coppersmith, S. N. |
author_sort | Friesen, Mark |
collection | PubMed |
description | Quantum computing promises significant speed-up for certain types of computational problems. However, robust implementations of semiconducting qubits must overcome the effects of charge noise that currently limit coherence during gate operations. Here we describe a scheme for protecting solid-state qubits from uniform electric field fluctuations by generalizing the concept of a decoherence-free subspace for spins, and we propose a specific physical implementation: a quadrupole charge qubit formed in a triple quantum dot. The unique design of the quadrupole qubit enables a particularly simple pulse sequence for suppressing the effects of noise during gate operations. Simulations yield gate fidelities 10–1,000 times better than traditional charge qubits, depending on the magnitude of the environmental noise. Our results suggest that any qubit scheme employing Coulomb interactions (for example, encoded spin qubits or two-qubit gates) could benefit from such a quadrupolar design. |
format | Online Article Text |
id | pubmed-5490009 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-54900092017-07-06 A decoherence-free subspace in a charge quadrupole qubit Friesen, Mark Ghosh, Joydip Eriksson, M. A. Coppersmith, S. N. Nat Commun Article Quantum computing promises significant speed-up for certain types of computational problems. However, robust implementations of semiconducting qubits must overcome the effects of charge noise that currently limit coherence during gate operations. Here we describe a scheme for protecting solid-state qubits from uniform electric field fluctuations by generalizing the concept of a decoherence-free subspace for spins, and we propose a specific physical implementation: a quadrupole charge qubit formed in a triple quantum dot. The unique design of the quadrupole qubit enables a particularly simple pulse sequence for suppressing the effects of noise during gate operations. Simulations yield gate fidelities 10–1,000 times better than traditional charge qubits, depending on the magnitude of the environmental noise. Our results suggest that any qubit scheme employing Coulomb interactions (for example, encoded spin qubits or two-qubit gates) could benefit from such a quadrupolar design. Nature Publishing Group 2017-06-23 /pmc/articles/PMC5490009/ /pubmed/28643778 http://dx.doi.org/10.1038/ncomms15923 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Friesen, Mark Ghosh, Joydip Eriksson, M. A. Coppersmith, S. N. A decoherence-free subspace in a charge quadrupole qubit |
title | A decoherence-free subspace in a charge quadrupole qubit |
title_full | A decoherence-free subspace in a charge quadrupole qubit |
title_fullStr | A decoherence-free subspace in a charge quadrupole qubit |
title_full_unstemmed | A decoherence-free subspace in a charge quadrupole qubit |
title_short | A decoherence-free subspace in a charge quadrupole qubit |
title_sort | decoherence-free subspace in a charge quadrupole qubit |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5490009/ https://www.ncbi.nlm.nih.gov/pubmed/28643778 http://dx.doi.org/10.1038/ncomms15923 |
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