Experimental demonstration of entanglement pumping with bosonic logical qubits

TL;DR

This paper experimentally demonstrates entanglement pumping using bosonic logical qubits, significantly extending entanglement lifetime and showcasing a new method for scalable quantum networks.

Contribution

It introduces a novel entanglement pumping scheme employing bosonic QEC codes, enhancing entanglement preservation in quantum systems.

Findings

Extended entanglement lifetime by nearly 50%

Effective error detection and mitigation within logical qubits

Potential for scalable quantum network applications

Abstract

Entanglement is crucial for quantum networks and computation, yet maintaining high-fidelity entangled quantum states is hindered by decoherence and resource-intensive purification methods. Here, we experimentally demonstrate entanglement pumping, utilizing bosonic quantum error correction (QEC) codes as long-coherence-time storage qubits. By repetitively generating entanglement with short-coherence-time qubits and injecting it into error-detectable logical qubits, our approach effectively preserves entanglement. Through error-detection to discard error states and entanglement pumping to mitigate errors within the code space, we extend the existence time of entanglement by nearly 50% compared to the case without entanglement pumping. This entanglement pumping scheme can additionally serve as an erasure detection protocol for the dual-rail code. This work highlights the potential of bosonic logical qubits for scalable quantum networks and introduces a novel paradigm for efficient entanglement management.