期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.150505
关键词
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资金
- Office of the Director of National Intelligence-Intelligence Advanced Research Projects Activity through ARO [W911NF-16-1-0082]
- DOE BES Award [DE-SC0019449]
- National Science Foundation Expeditions in Computing Award [1730104]
- National Science Foundation STAQ Project [Phy-1818914]
- DOE ASCR Award [DE-SC0019294]
- U.S. Department of Energy (DOE) [DE-SC0019294] Funding Source: U.S. Department of Energy (DOE)
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [1730104] Funding Source: National Science Foundation
In a large scale trapped atomic ion quantum computer, high-fidelity two-qubit gates need to be extended over all qubits with individual control. We realize and characterize high-fidelity two-qubit gates in a system with up to four ions using radial modes. The ions are individually addressed by two tightly focused beams steered using microelectromechanical system mirrors. We deduce a gate fidelity of 99.49(7)% in a two-ion chain and 99.30(6)% in a four-ion chain by applying a sequence of up to 21 two-qubit gates and measuring the final state fidelity. We characterize the residual errors and discuss methods to further improve the gate fidelity towards values that are compatible with fault-tolerant quantum computation.
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