Coherence time limit of the biphotons generated in a dense cold atom cloud

Biphotons with narrow bandwidth and long coherence time can enhance light-atom interaction, which leads to strong coupling between photonic and atomic qubits. Such strong coupling is desirable in quantum information processing, quantum storage and communication. In particular, paired photons with a...

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Main Authors:	Han, Zhiguang, Qian, Peng, Zhou, L., Chen, J. F., Zhang, Weiping
Format:	Online
Language:	English
Published:	Nature Publishing Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4361990/

id	pubmed-4361990
recordtype	oai_dc
spelling	pubmed-43619902015-03-19 Coherence time limit of the biphotons generated in a dense cold atom cloud Han, Zhiguang Qian, Peng Zhou, L. Chen, J. F. Zhang, Weiping Article Biphotons with narrow bandwidth and long coherence time can enhance light-atom interaction, which leads to strong coupling between photonic and atomic qubits. Such strong coupling is desirable in quantum information processing, quantum storage and communication. In particular, paired photons with a long coherence time over submicroseconds facilitate the direct manipulation of biphoton wavefunction. In this paper, we report the narrow-band biphotons with a coherence time of 2.34 μs generated from spontaneous four-wave mixing (SFWM) in a dense cold atom cloud, in which the anti-Stokes photons go through a narrow electromagnetically-induced transparency (EIT) window. In our knowledge, this is the best record of coherence time for paired photons achieved so far. A number of factors limiting the coherence time are analyzed in detail. We find the EIT coherence plays an essential role in determining the coherence time for paired photons. The EIT dephasing rate is the ultimate limit to the coherence time, and an ultra-long coherence time above ten microseconds is possible by further improvement of the dephasing rate below 100 kHz. Nature Publishing Group 2015-03-17 /pmc/articles/PMC4361990/ /pubmed/25778764 http://dx.doi.org/10.1038/srep09126 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved 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 in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Han, Zhiguang Qian, Peng Zhou, L. Chen, J. F. Zhang, Weiping
spellingShingle	Han, Zhiguang Qian, Peng Zhou, L. Chen, J. F. Zhang, Weiping Coherence time limit of the biphotons generated in a dense cold atom cloud
author_facet	Han, Zhiguang Qian, Peng Zhou, L. Chen, J. F. Zhang, Weiping
author_sort	Han, Zhiguang
title	Coherence time limit of the biphotons generated in a dense cold atom cloud
title_short	Coherence time limit of the biphotons generated in a dense cold atom cloud
title_full	Coherence time limit of the biphotons generated in a dense cold atom cloud
title_fullStr	Coherence time limit of the biphotons generated in a dense cold atom cloud
title_full_unstemmed	Coherence time limit of the biphotons generated in a dense cold atom cloud
title_sort	coherence time limit of the biphotons generated in a dense cold atom cloud
description	Biphotons with narrow bandwidth and long coherence time can enhance light-atom interaction, which leads to strong coupling between photonic and atomic qubits. Such strong coupling is desirable in quantum information processing, quantum storage and communication. In particular, paired photons with a long coherence time over submicroseconds facilitate the direct manipulation of biphoton wavefunction. In this paper, we report the narrow-band biphotons with a coherence time of 2.34 μs generated from spontaneous four-wave mixing (SFWM) in a dense cold atom cloud, in which the anti-Stokes photons go through a narrow electromagnetically-induced transparency (EIT) window. In our knowledge, this is the best record of coherence time for paired photons achieved so far. A number of factors limiting the coherence time are analyzed in detail. We find the EIT coherence plays an essential role in determining the coherence time for paired photons. The EIT dephasing rate is the ultimate limit to the coherence time, and an ultra-long coherence time above ten microseconds is possible by further improvement of the dephasing rate below 100 kHz.
publisher	Nature Publishing Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4361990/
_version_	1613199419644051456

Coherence time limit of the biphotons generated in a dense cold atom cloud

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