Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit

Abstract No-cloning theorem forbids perfect cloning of an unknown quantum state. A universal quantum cloning machine (UQCM), capable of producing two copies of any input qubit with the optimal fidelity, is of fundamental interest and has applications in quantum information processing. This is enable...

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Autores principales:	Zhen-Biao Yang, Pei-Rong Han, Xin-Jie Huang, Wen Ning, Hekang Li, Kai Xu, Dongning Zheng, Heng Fan, Shi-Biao Zheng
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/1d600c2174ca4e649311dba03b79ac9f
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spelling	oai:doaj.org-article:1d600c2174ca4e649311dba03b79ac9f2021-12-02T13:35:05ZExperimental demonstration of entanglement-enabled universal quantum cloning in a circuit10.1038/s41534-021-00375-52056-6387https://doaj.org/article/1d600c2174ca4e649311dba03b79ac9f2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00375-5https://doaj.org/toc/2056-6387Abstract No-cloning theorem forbids perfect cloning of an unknown quantum state. A universal quantum cloning machine (UQCM), capable of producing two copies of any input qubit with the optimal fidelity, is of fundamental interest and has applications in quantum information processing. This is enabled by delicately tailored nonclassical correlations between the input qubit and the copying qubits, which distinguish the UQCM from a classical counterpart, but whose experimental demonstrations are still lacking. We here implement the UQCM in a superconducting circuit and investigate these correlations. The measured entanglements well agree with our theoretical prediction that they are independent of the input state and thus constitute a universal quantum behavior of the UQCM that was not previously revealed. Another feature of our experiment is the realization of deterministic and individual cloning, in contrast to previously demonstrated UQCMs, which either were probabilistic or did not constitute true cloning of individual qubits.Zhen-Biao YangPei-Rong HanXin-Jie HuangWen NingHekang LiKai XuDongning ZhengHeng FanShi-Biao ZhengNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-5 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Zhen-Biao Yang Pei-Rong Han Xin-Jie Huang Wen Ning Hekang Li Kai Xu Dongning Zheng Heng Fan Shi-Biao Zheng Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
description	Abstract No-cloning theorem forbids perfect cloning of an unknown quantum state. A universal quantum cloning machine (UQCM), capable of producing two copies of any input qubit with the optimal fidelity, is of fundamental interest and has applications in quantum information processing. This is enabled by delicately tailored nonclassical correlations between the input qubit and the copying qubits, which distinguish the UQCM from a classical counterpart, but whose experimental demonstrations are still lacking. We here implement the UQCM in a superconducting circuit and investigate these correlations. The measured entanglements well agree with our theoretical prediction that they are independent of the input state and thus constitute a universal quantum behavior of the UQCM that was not previously revealed. Another feature of our experiment is the realization of deterministic and individual cloning, in contrast to previously demonstrated UQCMs, which either were probabilistic or did not constitute true cloning of individual qubits.
format	article
author	Zhen-Biao Yang Pei-Rong Han Xin-Jie Huang Wen Ning Hekang Li Kai Xu Dongning Zheng Heng Fan Shi-Biao Zheng
author_facet	Zhen-Biao Yang Pei-Rong Han Xin-Jie Huang Wen Ning Hekang Li Kai Xu Dongning Zheng Heng Fan Shi-Biao Zheng
author_sort	Zhen-Biao Yang
title	Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
title_short	Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
title_full	Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
title_fullStr	Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
title_full_unstemmed	Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
title_sort	experimental demonstration of entanglement-enabled universal quantum cloning in a circuit
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1d600c2174ca4e649311dba03b79ac9f
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Experimental demonstration of entanglement-enabled universal quantum cloning in a circuit

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