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Engineering integrated photonics for heralded quantum gates
Scaling up linear-optics quantum computing will require multi-photon gates which are compact, phase-stable, exhibit excellent quantum interference, and have success heralded by the detection of ancillary photons. We investigate the design, fabrication and characterisation of the optimal known gate s...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4901290/ https://www.ncbi.nlm.nih.gov/pubmed/27282928 http://dx.doi.org/10.1038/srep25126 |
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author | Meany, Thomas Biggerstaff, Devon N. Broome, Matthew A. Fedrizzi, Alessandro Delanty, Michael Steel, M. J. Gilchrist, Alexei Marshall, Graham D. White, Andrew G. Withford, Michael J. |
author_facet | Meany, Thomas Biggerstaff, Devon N. Broome, Matthew A. Fedrizzi, Alessandro Delanty, Michael Steel, M. J. Gilchrist, Alexei Marshall, Graham D. White, Andrew G. Withford, Michael J. |
author_sort | Meany, Thomas |
collection | PubMed |
description | Scaling up linear-optics quantum computing will require multi-photon gates which are compact, phase-stable, exhibit excellent quantum interference, and have success heralded by the detection of ancillary photons. We investigate the design, fabrication and characterisation of the optimal known gate scheme which meets these requirements: the Knill controlled-Z gate, implemented in integrated laser-written waveguide arrays. We show device performance to be less sensitive to phase variations in the circuit than to small deviations in the coupler reflectivity, which are expected given the tolerance values of the fabrication method. The mode fidelity is also shown to be less sensitive to reflectivity and phase errors than the process fidelity. Our best device achieves a fidelity of 0.931 ± 0.001 with the ideal 4 × 4 unitary circuit and a process fidelity of 0.680 ± 0.005 with the ideal computational-basis process. |
format | Online Article Text |
id | pubmed-4901290 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-49012902016-06-13 Engineering integrated photonics for heralded quantum gates Meany, Thomas Biggerstaff, Devon N. Broome, Matthew A. Fedrizzi, Alessandro Delanty, Michael Steel, M. J. Gilchrist, Alexei Marshall, Graham D. White, Andrew G. Withford, Michael J. Sci Rep Article Scaling up linear-optics quantum computing will require multi-photon gates which are compact, phase-stable, exhibit excellent quantum interference, and have success heralded by the detection of ancillary photons. We investigate the design, fabrication and characterisation of the optimal known gate scheme which meets these requirements: the Knill controlled-Z gate, implemented in integrated laser-written waveguide arrays. We show device performance to be less sensitive to phase variations in the circuit than to small deviations in the coupler reflectivity, which are expected given the tolerance values of the fabrication method. The mode fidelity is also shown to be less sensitive to reflectivity and phase errors than the process fidelity. Our best device achieves a fidelity of 0.931 ± 0.001 with the ideal 4 × 4 unitary circuit and a process fidelity of 0.680 ± 0.005 with the ideal computational-basis process. Nature Publishing Group 2016-06-10 /pmc/articles/PMC4901290/ /pubmed/27282928 http://dx.doi.org/10.1038/srep25126 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Meany, Thomas Biggerstaff, Devon N. Broome, Matthew A. Fedrizzi, Alessandro Delanty, Michael Steel, M. J. Gilchrist, Alexei Marshall, Graham D. White, Andrew G. Withford, Michael J. Engineering integrated photonics for heralded quantum gates |
title | Engineering integrated photonics for heralded quantum gates |
title_full | Engineering integrated photonics for heralded quantum gates |
title_fullStr | Engineering integrated photonics for heralded quantum gates |
title_full_unstemmed | Engineering integrated photonics for heralded quantum gates |
title_short | Engineering integrated photonics for heralded quantum gates |
title_sort | engineering integrated photonics for heralded quantum gates |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4901290/ https://www.ncbi.nlm.nih.gov/pubmed/27282928 http://dx.doi.org/10.1038/srep25126 |
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