Manipulating complex hybrid entanglement and testing multipartite Bell inequalities in a superconducting circuit

• URL: http://arxiv.org/abs/2005.09849v1
• Date: Wed, 20 May 2020 05:20:57 GMT
• Title: Manipulating complex hybrid entanglement and testing multipartite Bell inequalities in a superconducting circuit
• Authors: Yuwei Ma, Xiaoxuan Pan, Weizhou Cai, Xianghao Mu, Yuan Xu, Ling Hu, Weiting Wang, Haiyan Wang, Yi Pu Song, Zhen-Biao Yang, Shi-Biao Zheng and Luyan Sun
• Abstract summary: We create a five-partite entangled state with three superconducting transmon qubits and two photonic qubits, each encoded in the mesoscopic field of a microwave cavity. The measured Bell signal is $8.381pm0.038$, surpassing the bound of 8 for a four-partite entanglement imposed by quantum correlations by 10 standard deviations.
• Score: 8.333239829673463
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum correlations in observables of multiple systems not only are of fundamental interest, but also play a key role in quantum information processing. As a signature of these correlations, the violation of Bell inequalities has not been demonstrated with multipartite hybrid entanglement involving both continuous and discrete variables. Here we create a five-partite entangled state with three superconducting transmon qubits and two photonic qubits, each encoded in the mesoscopic field of a microwave cavity. We reveal the quantum correlations among these distinct elements by joint Wigner tomography of the two cavity fields conditional on the detection of the qubits and by test of a five-partite Bell inequality. The measured Bell signal is $8.381\pm0.038$, surpassing the bound of 8 for a four-partite entanglement imposed by quantum correlations by 10 standard deviations, demonstrating the genuine five-partite entanglement in a hybrid quantum system.

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