Multi-qubit entanglement and algorithms on a neutral-atom quantum computer

By T. M. Graham, Y. Song, J. Scott, C. Poole, L. Phuttitarn, K. Jooya, P. Eichler, X. Jiang, A. Marra, B. Grinkemeyer and 15 more. Nature, 2021

541 citations recorded by the source corpus.

Gate-model quantum computers promise to solve currently intractable computational problems if they can be operated at scale with long coherence times and high-fidelity logic. Neutral-atom hyperfine qubits provide inherent scalability owing to their identical characteristics, long coherence times and ability to be trapped in dense, multidimensional arrays1. Combined with the strong entangling interactions provided by Rydberg states2–4, all the necessary characteristics for quantum computation are available. Here we demonstrate several quantum algorithms on a programmable gate-model neutral-atom quantum computer in an architecture based on individual addressing of single atoms with tightly focused optical beams scanned across a two-dimensional array of qubits. Preparation of entangled Greenberger–Horne–Zeilinger (GHZ) states5 with up to six qubits, quantum phase estimation for a chemistry problem6 and the quantum approximate optimization algorithm (QAOA)7 for the maximum cut (MaxCut) graph problem are demonstrated. These results highlight the emergent capability of neutral-atom qubit arrays for universal, programmable quantum computation, as well as preparation of non-classical states of use for quantum-enhanced sensing. A programmable neutral-atom quantum computer based on a two-dimensional array of qubits led to the creation of 2–6-qubit Greenberger–Horne–Zeilinger states and showed the ability to execute quantum phase estimation and optimization algorithms.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/bf0febc2576170da9727c420af1a547262aaea4b

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Citations in the corpus

Midcircuit Operations Using the omg Architecture in Neutral Atom Arrays (2023, methodology): “Combining the tools demonstrated in this work with Rydberg-mediated interactions is one potential path to realizing these models experimentally [82,83,94 – 96].”
Logical quantum processor based on reconfigurable atom arrays (2023, methodology): “Local single-qubit gates 34,72 with the Raman AOD are realized in arbitrary positions in space on both AOD and SLM atoms.”