Heralded entanglement distribution between two absorptive quantum memories
Owing to the inevitable loss in communication channels, the distance of entanglement distribution is limited to approximately 100 kilometres on the ground 1 . Quantum repeaters can circumvent this problem by using quantum memory and entanglement swapping 2 . As the elementary link of a quantum repea...
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| Veröffentlicht in: | Nature (London) 2021-06, Vol.594 (7861), p.41-45 |
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| creator | Liu, Xiao Hu, Jun Li, Zong-Feng Li, Xue Li, Pei-Yun Liang, Peng-Jun Zhou, Zong-Quan Li, Chuan-Feng Guo, Guang-Can |
| description | Owing to the inevitable loss in communication channels, the distance of entanglement distribution is limited to approximately 100 kilometres on the ground
1
. Quantum repeaters can circumvent this problem by using quantum memory and entanglement swapping
2
. As the elementary link of a quantum repeater, the heralded distribution of two-party entanglement between two remote nodes has only been realized with built-in-type quantum memories
3
–
9
. These schemes suffer from the trade-off between multiplexing capacity and deterministic properties and hence hinder the development of efficient quantum repeaters. Quantum repeaters based on absorptive quantum memories can overcome such limitations because they separate the quantum memories and the quantum light sources. Here we present an experimental demonstration of heralded entanglement between absorptive quantum memories. We build two nodes separated by 3.5 metres, each containing a polarization-entangled photon-pair source and a solid-state quantum memory with bandwidth up to 1 gigahertz. A joint Bell-state measurement in the middle station heralds the successful distribution of maximally entangled states between the two quantum memories with a fidelity of 80.4 ± 2.2 per cent (±1 standard deviation). The quantum nodes and channels demonstrated here can serve as an elementary link of a quantum repeater. Moreover, the wideband absorptive quantum memories used in the nodes are compatible with deterministic entanglement sources and can simultaneously support multiplexing, which paves the way for the construction of practical solid-state quantum repeaters and high-speed quantum networks.
Heralded entanglement is realized between two solid-state absorptive quantum memories 3.5 metres apart and with a bandwidth of 1 gigahertz, and with a fidelity of approximately 80%. |
| doi_str_mv | 10.1038/s41586-021-03505-3 |
| format | Article |
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1
. Quantum repeaters can circumvent this problem by using quantum memory and entanglement swapping
2
. As the elementary link of a quantum repeater, the heralded distribution of two-party entanglement between two remote nodes has only been realized with built-in-type quantum memories
3
–
9
. These schemes suffer from the trade-off between multiplexing capacity and deterministic properties and hence hinder the development of efficient quantum repeaters. Quantum repeaters based on absorptive quantum memories can overcome such limitations because they separate the quantum memories and the quantum light sources. Here we present an experimental demonstration of heralded entanglement between absorptive quantum memories. We build two nodes separated by 3.5 metres, each containing a polarization-entangled photon-pair source and a solid-state quantum memory with bandwidth up to 1 gigahertz. A joint Bell-state measurement in the middle station heralds the successful distribution of maximally entangled states between the two quantum memories with a fidelity of 80.4 ± 2.2 per cent (±1 standard deviation). The quantum nodes and channels demonstrated here can serve as an elementary link of a quantum repeater. Moreover, the wideband absorptive quantum memories used in the nodes are compatible with deterministic entanglement sources and can simultaneously support multiplexing, which paves the way for the construction of practical solid-state quantum repeaters and high-speed quantum networks.
Heralded entanglement is realized between two solid-state absorptive quantum memories 3.5 metres apart and with a bandwidth of 1 gigahertz, and with a fidelity of approximately 80%.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/s41586-021-03505-3</identifier><identifier>PMID: 34079139</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>639/766/400/482 ; 639/766/483/481 ; Absorptivity ; Channels ; Communication channels ; Efficiency ; Entangled states ; Humanities and Social Sciences ; Light sources ; multidisciplinary ; Multiplexing ; Nodes ; Quantum entanglement ; Quantum phenomena ; Repeaters ; Science ; Science (multidisciplinary) ; Solid state ; Standard deviation</subject><ispartof>Nature (London), 2021-06, Vol.594 (7861), p.41-45</ispartof><rights>The Author(s), under exclusive licence to Springer Nature Limited 2021</rights><rights>Copyright Nature Publishing Group Jun 3, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c375t-abe90012e8bcc54f7e8049e09cc059f3d829dc4b4314e4af228d4ef42dee7183</citedby><cites>FETCH-LOGICAL-c375t-abe90012e8bcc54f7e8049e09cc059f3d829dc4b4314e4af228d4ef42dee7183</cites><orcidid>0000-0001-6815-8929 ; 0000-0001-6357-0084</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/s41586-021-03505-3$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/s41586-021-03505-3$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/34079139$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Liu, Xiao</creatorcontrib><creatorcontrib>Hu, Jun</creatorcontrib><creatorcontrib>Li, Zong-Feng</creatorcontrib><creatorcontrib>Li, Xue</creatorcontrib><creatorcontrib>Li, Pei-Yun</creatorcontrib><creatorcontrib>Liang, Peng-Jun</creatorcontrib><creatorcontrib>Zhou, Zong-Quan</creatorcontrib><creatorcontrib>Li, Chuan-Feng</creatorcontrib><creatorcontrib>Guo, Guang-Can</creatorcontrib><title>Heralded entanglement distribution between two absorptive quantum memories</title><title>Nature (London)</title><addtitle>Nature</addtitle><addtitle>Nature</addtitle><description>Owing to the inevitable loss in communication channels, the distance of entanglement distribution is limited to approximately 100 kilometres on the ground
1
. Quantum repeaters can circumvent this problem by using quantum memory and entanglement swapping
2
. As the elementary link of a quantum repeater, the heralded distribution of two-party entanglement between two remote nodes has only been realized with built-in-type quantum memories
3
–
9
. These schemes suffer from the trade-off between multiplexing capacity and deterministic properties and hence hinder the development of efficient quantum repeaters. Quantum repeaters based on absorptive quantum memories can overcome such limitations because they separate the quantum memories and the quantum light sources. Here we present an experimental demonstration of heralded entanglement between absorptive quantum memories. We build two nodes separated by 3.5 metres, each containing a polarization-entangled photon-pair source and a solid-state quantum memory with bandwidth up to 1 gigahertz. A joint Bell-state measurement in the middle station heralds the successful distribution of maximally entangled states between the two quantum memories with a fidelity of 80.4 ± 2.2 per cent (±1 standard deviation). The quantum nodes and channels demonstrated here can serve as an elementary link of a quantum repeater. Moreover, the wideband absorptive quantum memories used in the nodes are compatible with deterministic entanglement sources and can simultaneously support multiplexing, which paves the way for the construction of practical solid-state quantum repeaters and high-speed quantum networks.
Heralded entanglement is realized between two solid-state absorptive quantum memories 3.5 metres apart and with a bandwidth of 1 gigahertz, and with a fidelity of approximately 80%.</description><subject>639/766/400/482</subject><subject>639/766/483/481</subject><subject>Absorptivity</subject><subject>Channels</subject><subject>Communication channels</subject><subject>Efficiency</subject><subject>Entangled states</subject><subject>Humanities and Social Sciences</subject><subject>Light sources</subject><subject>multidisciplinary</subject><subject>Multiplexing</subject><subject>Nodes</subject><subject>Quantum entanglement</subject><subject>Quantum phenomena</subject><subject>Repeaters</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><subject>Solid state</subject><subject>Standard 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Zong-Feng</au><au>Li, Xue</au><au>Li, Pei-Yun</au><au>Liang, Peng-Jun</au><au>Zhou, Zong-Quan</au><au>Li, Chuan-Feng</au><au>Guo, Guang-Can</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Heralded entanglement distribution between two absorptive quantum memories</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><addtitle>Nature</addtitle><date>2021-06-03</date><risdate>2021</risdate><volume>594</volume><issue>7861</issue><spage>41</spage><epage>45</epage><pages>41-45</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><abstract>Owing to the inevitable loss in communication channels, the distance of entanglement distribution is limited to approximately 100 kilometres on the ground
1
. Quantum repeaters can circumvent this problem by using quantum memory and entanglement swapping
2
. As the elementary link of a quantum repeater, the heralded distribution of two-party entanglement between two remote nodes has only been realized with built-in-type quantum memories
3
–
9
. These schemes suffer from the trade-off between multiplexing capacity and deterministic properties and hence hinder the development of efficient quantum repeaters. Quantum repeaters based on absorptive quantum memories can overcome such limitations because they separate the quantum memories and the quantum light sources. Here we present an experimental demonstration of heralded entanglement between absorptive quantum memories. We build two nodes separated by 3.5 metres, each containing a polarization-entangled photon-pair source and a solid-state quantum memory with bandwidth up to 1 gigahertz. A joint Bell-state measurement in the middle station heralds the successful distribution of maximally entangled states between the two quantum memories with a fidelity of 80.4 ± 2.2 per cent (±1 standard deviation). The quantum nodes and channels demonstrated here can serve as an elementary link of a quantum repeater. Moreover, the wideband absorptive quantum memories used in the nodes are compatible with deterministic entanglement sources and can simultaneously support multiplexing, which paves the way for the construction of practical solid-state quantum repeaters and high-speed quantum networks.
Heralded entanglement is realized between two solid-state absorptive quantum memories 3.5 metres apart and with a bandwidth of 1 gigahertz, and with a fidelity of approximately 80%.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>34079139</pmid><doi>10.1038/s41586-021-03505-3</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0001-6815-8929</orcidid><orcidid>https://orcid.org/0000-0001-6357-0084</orcidid></addata></record> |
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| subjects | 639/766/400/482 639/766/483/481 Absorptivity Channels Communication channels Efficiency Entangled states Humanities and Social Sciences Light sources multidisciplinary Multiplexing Nodes Quantum entanglement Quantum phenomena Repeaters Science Science (multidisciplinary) Solid state Standard deviation |
| title | Heralded entanglement distribution between two absorptive quantum memories |
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