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Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity
The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctua...
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/PMC5007450/ https://www.ncbi.nlm.nih.gov/pubmed/27562246 http://dx.doi.org/10.1038/ncomms12548 |
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author | Lähteenmäki, Pasi Paraoanu, Gheorghe Sorin Hassel, Juha Hakonen, Pertti J. |
author_facet | Lähteenmäki, Pasi Paraoanu, Gheorghe Sorin Hassel, Juha Hakonen, Pertti J. |
author_sort | Lähteenmäki, Pasi |
collection | PubMed |
description | The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctuations stimulate spontaneous downconversion processes, creating squeezing between modes symmetric with respect to half of the frequency of the pump. Here we show that by double parametric pumping of a superconducting microwave cavity, it is possible to generate another type of correlation, namely coherence between photons in separate frequency modes. The coherence correlations are tunable by the phases of the pumps and are established by a quantum fluctuation that stimulates the simultaneous creation of two photon pairs. Our analysis indicates that the origin of this vacuum-induced coherence is the absence of which-way information in the frequency space. |
format | Online Article Text |
id | pubmed-5007450 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-50074502016-09-14 Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity Lähteenmäki, Pasi Paraoanu, Gheorghe Sorin Hassel, Juha Hakonen, Pertti J. Nat Commun Article The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctuations stimulate spontaneous downconversion processes, creating squeezing between modes symmetric with respect to half of the frequency of the pump. Here we show that by double parametric pumping of a superconducting microwave cavity, it is possible to generate another type of correlation, namely coherence between photons in separate frequency modes. The coherence correlations are tunable by the phases of the pumps and are established by a quantum fluctuation that stimulates the simultaneous creation of two photon pairs. Our analysis indicates that the origin of this vacuum-induced coherence is the absence of which-way information in the frequency space. Nature Publishing Group 2016-08-26 /pmc/articles/PMC5007450/ /pubmed/27562246 http://dx.doi.org/10.1038/ncomms12548 Text en Copyright © 2016, The Author(s) 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 Lähteenmäki, Pasi Paraoanu, Gheorghe Sorin Hassel, Juha Hakonen, Pertti J. Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
title | Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
title_full | Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
title_fullStr | Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
title_full_unstemmed | Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
title_short | Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
title_sort | coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5007450/ https://www.ncbi.nlm.nih.gov/pubmed/27562246 http://dx.doi.org/10.1038/ncomms12548 |
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