Entangling remote superconducting qubits via transducer-generated multi-time-bin states

TL;DR

This paper proposes a method to entangle remote superconducting qubits using microwave-optical transduction with multi-time-bin states, improving fidelity and robustness against noise, advancing scalable quantum networks.

Contribution

It introduces a novel entanglement protocol utilizing multi-time-bin states for superconducting qubits, enhancing fidelity and noise resilience without purification.

Findings

Fidelity improves from 0.75 to 0.98 in ideal transduction systems.

Fidelity increases from 0.66 to 0.89 in noisy channels.

The protocol enables scalable, heterogeneous quantum systems.

Abstract

Recent studies have shown long-distance entanglement using NV centers, atoms, and quantum dots with single-photon time-bin encoding. We propose a method to entangle remote superconducting qubits via microwave-optical transduction using multi-time-bin states. By adapting conventional entanglement swapping techniques, fidelity improves from 0.75 to $0.98$ in transduction systems, and 0.66 to 0.89 in noisy channels. The protocol mitigates thermal noise without relying on purification and offers a practical path toward scalable, heterogeneous quantum systems.