Experimental entanglement of six photons in graph states

By Chaoyang Lu, Xiaoqi Zhou, Otfried Gühne, Wei-bo Gao, Jin Zhang, Zhen-Sheng Yuan, A. Goebel, Tao Yang, Jian-Wei Pan. 2006

602 citations recorded by the source corpus.

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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/a3dd791ebeb54615fd41bef1b232bae84a3742e5

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Citations in the corpus

Entanglement certification from theory to experiment (2018, background): “Subsequent experiments haves since extended this idea of “entanglement through information erasure”, entangling four [201], six [202], eight [203], ten [204], and most recently, a record twelve photons [205] in their polarisation.”
Observation of eight-photon entanglement (2011, unknown): “From the ( p × ξ ) data from previous six-photon experiment”
Neural-network quantum state tomography (2017, background): “9 24 This setup implies that we circumvent the need to achieve low levels of intrinsic Gaussian noise in the evaluations of mean values of operators.”
Experimental demonstration of a hyper-entangled ten-qubit Schr\ (2008, background): “Experiments in recent years have demonstrated the photons’ extremely long decoherence time (14), fast clock speed (15), a series of controlled quantum logic gates (16-19) and algorithms (15,20-22), and the generation of various multiqubit entangled states (6,23).”
Continuous-variable optical quantum-state tomography (2009, methodology): “It is thus less suitable for characterizing multimode states: to date, the largest qubit systems measured using photon counting contained six qubits Lu et al., 2007 while with OHT, only single dual-rail qubits were reconstructed Babichev, Appel, and Lvovsky, 2004 .”
Direct generation of three-photon polarization entanglement (2014, background): “[10] C.”
Multiphoton entanglement and interferometry (2008, background): “Few-qubit cluster states of photons were created in several recent experiments (Zhang et al., 2006a; Walther et al., 2005b; Kiesel et al., 2005; Schmid et al., 2007; Lu et al., 2007).”
Quantum memories: emerging applications and recent advances (2015, background): “Experimental preparation of photonic cluster states and demonstrations of one-way quantum computing have been achieved for a limited number of qubits [247, 248].”