Fast measurements and multiqubit gates in dual species atomic arrays

TL;DR

This paper introduces a rapid method for syndrome measurements in dual-species atomic arrays using inter-species CNOT gates, achieving high fidelity and fast operation suitable for quantum error correction.

Contribution

It presents a novel scheme for fast, high-fidelity syndrome measurements in rubidium and cesium atomic qubits using Rydberg interactions and inter-species gates.

Findings

Achieves syndrome measurement fidelity >0.9999

Performs measurements in less than 5 microseconds

Demonstrates feasibility of multiqubit gates in dual-species arrays

Abstract

We propose and analyze an approach for fast syndrome measurements in an array of rubidium and cesium atomic qubits. The scheme works by implementing an inter-species $\textsf{CNOT}_k$ gate, entangling one cesium ancilla qubit with $k\geq 1$ rubidium qubits which are then used for state measurement. Utilizing Rydberg states with different inter- and intra-species interaction strengths, the proposal provides a syndrome measurement fidelity of $\mathcal{F}>0.9999$ in less than 5 $\mu$s of integration time.