Scalable Creation of Long-Lived Multipartite Entanglement

Physical Review Letters
H KaufmannU Poschinger

Abstract

We demonstrate the deterministic generation of multipartite entanglement based on scalable methods. Four qubits are encoded in ^{40}Ca^{+}, stored in a microstructured segmented Paul trap. These qubits are sequentially entangled by laser-driven pairwise gate operations. Between these, the qubit register is dynamically reconfigured via ion shuttling operations, where ion crystals are separated and merged, and ions are moved in and out of a fixed laser interaction zone. A sequence consisting of three pairwise entangling gates yields a four-ion Greenberger-Horne-Zeilinger state |ψ⟩=(1/sqrt[2])(|0000⟩+|1111⟩), and full quantum state tomography reveals a state fidelity of 94.4(3)%. We analyze the decoherence of this state and employ dynamic decoupling on the spatially distributed constituents to maintain 69(5)% coherence at a storage time of 1.1 sec.

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Citations

Nov 18, 2018·Physical Review Letters·Yotam ShapiraRoee Ozeri
Jul 26, 2019·Nature·Yao LuKihwan Kim
Oct 24, 2020·Physical Review Letters·Wei LiPatrick Windpassinger
Dec 9, 2020·Entropy·Shijiao WangMu-Tian Cheng
Oct 23, 2020·Nature·Karan K MehtaJonathan P Home

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