High-fidelity multiqubit Rydberg gates via two-photon adiabatic rapid passage

Pelegrí, G and Daley, A J and Pritchard, J D (2022) High-fidelity multiqubit Rydberg gates via two-photon adiabatic rapid passage. Quantum Science and Technology, 7 (4). 045020. ISSN 2058-9565 (https://doi.org/10.1088/2058-9565/ac823a)

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Abstract

We present a robust protocol for implementing high-fidelity multiqubit controlled phase gates (CkZ) on neutral atom qubits coupled to highly excited Rydberg states. Our approach is based on extending adiabatic rapid passage to two-photon excitation via a short-lived intermediate excited state common to alkali-atom Rydberg experiments, accounting for the full impact of spontaneous decay and differential AC Stark shifts from the complete manifold of hyperfine excited states. We evaluate and optimise gate performance, concluding that for Cs and currently available laser frequencies and powers, a CCZ gate with fidelity F > 0.995 for three qubits and CCCZ with F > 0.99 for four qubits is attainable in ∼ 1.8 μs via this protocol. Higher fidelities are accessible with future technologies, and our results highlight the utility of neutral atom arrays for the native implementation of multiqubit unitaries.

  • Item type:Article
    ID code:81728
    Dates:
    Date
    Event
    17 August 2022
    Published
    19 July 2022
    Published Online
    19 July 2022
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:04 Aug 2022 15:11
    Last modified:25 Apr 2024 01:28
    URI:https://strathprints.strath.ac.uk/id/eprint/81728
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