Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer

Fang, Chao; Wang, Ye; Huang, Shilin; Brown, Kenneth R.; Kim, Jungsang

doi:10.1103/physrevlett.129.240504

Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer

Journal Article · Tue Dec 06 23:00:00 EST 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.129.240504· OSTI ID:2280974

^[1]; ^[2]; Huang, Shilin ^[3]; Brown, Kenneth R. ^[3]; Kim, Jungsang ^[4]

Duke Univ., Durham, NC (United States); Duke University
Duke Univ., Durham, NC (United States); Univ. of Science and Technology of China, Hefei (China)
Duke Univ., Durham, NC (United States)
Duke Univ., Durham, NC (United States); IonQ, Inc., College Park, MD (United States)

Crosstalk between target and neighboring spectator qubits due to spillover of control signals represents a major error source limiting the fidelity of two-qubit entangling gates in quantum computers. We show that in our laser-driven trapped-ion system coherent crosstalk error can be modeled as residual $$X\hat{σ}_{\phi}$$ interaction and can be actively canceled by single-qubit echoing pulses. We propose and demonstrate a crosstalk suppression scheme that eliminates all first-order crosstalk utilizing only local control of target qubits, as opposed to an existing scheme which requires control over all neighboring qubits. We report a two-qubit Bell state fidelity of 99.52(6)% with the echoing pulses applied after collective gates and 99.37(5)% with the echoing pulses applied to each gate in a five-ion chain. Finally, this scheme is widely applicable to other platforms with analogous interaction Hamiltonians.

View Accepted Manuscript (DOE)

Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); US Army Research Office (ARO); National Science Foundation (NSF)

Grant/Contract Number:: SC0019449; SC0019294

OSTI ID:: 2280974

Alternate ID(s):: OSTI ID: 1902442

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 129; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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