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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.
|Number of pages||12|
|Journal||Quantum Science and Technology|
|Early online date||19 Jul 2022|
|Publication status||Published - 17 Aug 2022|
- Ryberg states
- alkali-atom Ryberg experiments
- atom qubits
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- 1 Active
Data for: "High-fidelity multiqubit Rydberg gates via two-photon adiabatic rapid passage"
Pelegri, G. (Creator), Daley, A. (Creator) & Pritchard, J. (Creator), University of Strathclyde, 14 Dec 2021
- 1 Invited talk
Scalable Qubit Arrays for Quantum Computation and Optimisation
Jonathan Pritchard (Speaker)31 Mar 2023
Activity: Talk or presentation types › Invited talk