title: Single-qubit gates based on targeted phase shifts in a 3D neutral atom array.
abstract: 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).
authors.affiliation: Department of Physics, Pennsylvania State University, University Park, PA, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Physics, Pennsylvania State University, University Park, PA, USA.
authors.forename: Aishwarya
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Physics, Pennsylvania State University, University Park, PA, USA.
authors.forename: Tsung-Yao
authors.initials: TY
authors.lastname: Wu
authors.affiliation: Department of Physics, Pennsylvania State University, University Park, PA, USA. dsweiss@phys.psu.edu.
authors.forename: David S
authors.initials: DS
authors.lastname: Weiss