Multi-Qubit Stabilizer Readout on a Dual-Species Rydberg Array

TL;DR

This paper demonstrates a dual-species Rydberg atom array for non-destructive, simultaneous stabilizer measurements crucial for quantum error correction, addressing interspecies interaction challenges with a compensation protocol.

Contribution

It introduces a protocol for high-fidelity, non-destructive stabilizer readout in dual-species Rydberg arrays, advancing scalable quantum error correction methods.

Findings

Achieved non-destructive measurement of four-qubit stabilizers using global pulses.

Identified and compensated for interspecies Rydberg interaction-induced errors.

Demonstrated potential for scalable quantum error correction with dual-species arrays.

Abstract

The ability to locally control and measure subsets of ancilla qubits in an efficient and crosstalk-free manner is a key ingredient in quantum error correction (QEC). Dual-species neutral atom arrays offer an ideal implementation of these capabilities, enabling independent state preparation, manipulation, and detection on each species. In this work, we realize such a dual-species Rydberg array of Na and Cs atoms trapped in co-localized 2D optical tweezer arrays, using Na as an ancilla to measure stabilizers of surrounding Cs data qubits. We identify the finite interspecies Rydberg-Rydberg interaction strength as a practical obstacle to high-fidelity multi-body entanglement and show that, by tuning the Rabi frequency and the detuning of the Rydberg driving field, the resulting geometric phase error can be compensated. This yields a protocol for simultaneous, non-destructive, in situ stabilizer readout of multiple data qubits via global pulses alone. Using this protocol, we demonstrate non-destructive measurement of Pauli-Z stabilizers on four-qubit Cs plaquettes via a single global Rydberg pulse sequence. Our results demonstrate dual-species tweezer arrays as a promising route towards scalable QEC and open the door to new quantum control protocols leveraging both interspecies and intraspecies interactions.