Experimental entanglement of six photons in graph states
Chao-Yang Lu,Xiao-Qi Zhou,Otfried Gühne,Weibo Gao,Jin Zhang,Zhen-Sheng Yuan,Alexander Goebel,Tao Yang,Jian-Wei Pan,Jian-Wei Pan +9 more
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In this article, the authors demonstrate the experimental entanglement of six photons and engineering of multiqubit graph states, including the largest photonic Schrodinger cat and a six-photon cluster state.Abstract:
Graph states1,2,3—multipartite entangled states that can be represented by mathematical graphs—are important resources for quantum computation4, quantum error correction3, studies of multiparticle entanglement1 and fundamental tests of non-locality5,6,7 and decoherence8. Here, we demonstrate the experimental entanglement of six photons and engineering of multiqubit graph states9,10,11. We have created two important examples of graph states, a six-photon Greenberger–Horne–Zeilinger state5, the largest photonic Schrodinger cat so far, and a six-photon cluster state2, a state-of-the-art ‘one-way quantum computer’4. With small modifications, our method allows us, in principle, to create various further graph states, and therefore could open the way to experimental tests of, for example, quantum algorithms4,12 or loss- and fault-tolerant one-way quantum computation13,14.read more
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References
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Mixed State Entanglement and Quantum Error Correction
Charles H. Bennett,Charles H. Bennett,Charles H. Bennett,David P. DiVincenzo,David P. DiVincenzo,David P. DiVincenzo,John A. Smolin,John A. Smolin,John A. Smolin,William K. Wootters,William K. Wootters,William K. Wootters +11 more
TL;DR: It is proved that an EPP involving one-way classical communication and acting on mixed state M (obtained by sharing halves of Einstein-Podolsky-Rosen pairs through a channel) yields a QECC on \ensuremath{\chi} with rate Q=D, and vice versa, and it is proved Q is not increased by adding one- way classical communication.
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A one-way quantum computer.
TL;DR: A scheme of quantum computation that consists entirely of one-qubit measurements on a particular class of entangled states, the cluster states, which are thus one-way quantum computers and the measurements form the program.
Journal ArticleDOI
New high-intensity source of polarization-entangled photon pairs.
Paul G. Kwiat,Klaus Mattle,Harald Weinfurter,Anton Zeilinger,Alexander V. Sergienko,Yanhua Shih +5 more
TL;DR: Type-II noncollinear phase matching in parametric down conversion produces true entanglement: No part of the wave function must be discarded, in contrast to previous schemes.
Journal ArticleDOI
Bell’s theorem without inequalities
TL;DR: In this article, it was shown that the premisses of the Einstein-Podolsky-Rosen paper are inconsistent when applied to quantum systems consisting of at least three particles.