Duke University and IonQ have created the first three-node quantum network with atomic qubits, marking a significant step toward the quantum internet.
Duke University and IonQ have successfully established the first fully distributed three-node quantum network utilizing individual atomic qubits, as reported by Quantum Computing Report.
The researchers achieved a tripartite entangled state among three quantum nodes that are interconnected via photonic channels.
Overview of the Achievement
Quantum entanglement facilitates a connection among particles, enabling changes in one particle to be instantly reflected in others, regardless of the distance. This property is crucial for the development of future quantum networks and the quantum internet.
While previous research has demonstrated entanglement with two nodes or even three-node networks using various physical systems, this marks the first instance of achieving such results with independently controlled atomic qubits, suitable for scalable computational applications.
Significance of the Research
One of the primary challenges in quantum computing is scaling up systems, as constructing a large single quantum processor is fraught with difficulties due to error rates and hardware constraints.
To address this, many researchers are exploring a modular design, where a network of quantum nodes linked by photons replaces the need for a single large processor. This model mirrors the evolution of the classical internet, which relies on distributed computational resources.
The recent experiment is a significant advancement in this area, demonstrating that individual atomic memories can establish a shared quantum state through photonic connections while preserving high fidelity in their quantum operations.
The researchers recorded a fidelity rate for the entangled state ranging from 84% to 88% and successfully addressed the "detection loophole" in a fully distributed multi-component quantum state for the first time. Additionally, they confirmed a violation of the Mermin inequality, a crucial test for identifying authentic quantum correlations.
Progress Toward a Quantum Internet
This research builds upon IonQ's ongoing exploration of photonic quantum connections. The company had previously achieved entanglement between two remote ion systems and has now successfully expanded this framework to include three nodes.
Although commercial applications are still a distant goal, these experiments are foundational for the development of future distributed quantum computers, secure communication networks, and the quantum internet. Notably, in June, Colt Technology Services and Ciena successfully demonstrated data transmission with quantum-resistant encryption between New York and London.
