Demonstration of multi-qubit entanglement and algorithms on a programmable neutral atom quantum computer
Abstract
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 due to their identical characteristics, long coherence times, and ability to be trapped in dense multi-dimensional arraysSaffman2010. Combined with the strong entangling interactions provided by Rydberg statesJaksch2000,Gaetan2009,Urban2009, 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) statesGreenberger1989 with up to 6 qubits, quantum phase estimation for a chemistry problemAspuru-Guzik2005, and the Quantum Approximate Optimization Algorithm (QAOA)Farhi2014 for the 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.
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