Experimental Realization of a Controlled-NOT Gate with Four-Photon Six-Qubit Cluster States

Wei-Bo Gao, Ping Xu, Xing-Can Yao, Otfried Gühne, Adán Cabello, Chao-Yang Lu, Cheng-Zhi Peng, Zeng-Bing Chen, and Jian-Wei Pan
Phys. Rev. Lett. 104, 020501 – Published 13 January 2010

Abstract

We experimentally demonstrate an optical controlled-NOT (CNOT) gate with arbitrary single inputs based on a 4-photon 6-qubit cluster state entangled both in polarization and spatial modes. We first generate the 6-qubit state, and then, by performing single-qubit measurements, the CNOT gate is applied to arbitrary single input qubits. To characterize the performance of the gate, we estimate its quantum process fidelity and prove its entangling capability. In addition, our results show that the gate cannot be reproduced by local operations and classical communication. Our experiment shows that such hyper-entangled cluster states are promising candidates for efficient optical quantum computation.

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  • Received 19 June 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.020501

©2010 American Physical Society

Authors & Affiliations

Wei-Bo Gao1, Ping Xu1, Xing-Can Yao1, Otfried Gühne2,3, Adán Cabello4, Chao-Yang Lu1, Cheng-Zhi Peng1, Zeng-Bing Chen1, and Jian-Wei Pan1,5

  • 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstraße 21A, A-6020 Innsbruck, Austria
  • 3Institut für theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
  • 4Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain
  • 5Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

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Issue

Vol. 104, Iss. 2 — 15 January 2010

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