Single-qubit gates based on targeted phase shifts in a 3D neutral atom array

• Autores: Yang Wang, Aishwarya Kumar, Tsung-Yao Wu
• Localización: Science, ISSN 0036-8075, Vol. 352, Nº 6293, 2016, págs. 1562-1565
• Idioma: inglés
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• Resumen

  • Although the quality of individual quantum bits (qubits) and quantum gates has been steadily improving, the number of qubits in a single system has increased quite slowly. Here, we demonstrate arbitrary single-qubit gates based on targeted phase shifts, an approach that can be applied to atom, ion, or other atom-like systems. These gates are highly insensitive to addressing beam imperfections and have little cross-talk, allowing for a dramatic scaling up of qubit number. We have performed gates in series on 48 individually targeted sites in a 40% full 5 by 5 by 5 three-dimensional array created by an optical lattice. Using randomized benchmarking, we demonstrate an average gate fidelity of 0.9962(16), with an average cross-talk fidelity of 0.9979(2) (numbers in parentheses indicate the one standard deviation uncertainty in the final digits).