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

TL;DR

This paper demonstrates a scalable method for implementing high-fidelity single-qubit gates in 3D neutral atom arrays using targeted phase shifts, addressing key challenges in increasing qubit numbers for quantum computing.

Contribution

The authors introduce a new approach for arbitrary single-qubit gates based on targeted phase shifts that is highly insensitive to beam imperfections and crosstalk, enabling larger qubit arrays.

Findings

Achieved high-fidelity single-qubit gates with 0.9962 average fidelity.

Successfully performed gates on 48 sites in a 3D array.

Demonstrated low crosstalk with fidelity of 0.9979.

Abstract

Although the quality of quantum bits (qubits) and quantum gates has been steadily improving, the available quantity of qubits has increased quite slowly. To address this important issue in quantum computing, we have demonstrated 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 crosstalk, allowing for a dramatic scaling up of qubit number. We have performed gates in series on 48 individually targeted sites in a 40% full $5\times 5\times 5$ 3D array created by an optical lattice. Using randomized benchmarking, we demonstrate an average gate fidelity of 0.9962(16), with an average crosstalk fidelity of 0.9979(2).