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Although the quality of quantum bits (qubits) and quantum gates has beensteadily improving, the available quantity of qubits has increased quiteslowly. To address this important issue in quantum computing, we havedemonstrated arbitrary single qubit gates based on targeted phase shifts, anapproach that can be applied to atom, ion or other atom-like systems. Thesegates are highly insensitive to addressing beam imperfections and have littlecrosstalk, allowing for a dramatic scaling up of qubit number. We haveperformed gates in series on 48 individually targeted sites in a 40% full$5\times 5\times 5$ 3D array created by an optical lattice. Using randomizedbenchmarking, we demonstrate an average gate fidelity of 0.9962(16), with anaverage crosstalk fidelity of 0.9979(2).

Universal gates based on targeted phase shifts in a 3D neutral atom array