GHZ-Equivalent State Distribution in Quantum Networks: Reducing Decoherence and Quantum Resource Consumption
Networking and Internet Architecture
Summary
The authors present a new way to share special quantum states called GHZ-equivalent states across quantum networks that have repeaters, focusing on reducing errors caused by noise during transmission. Their method allows users far apart to share graph states, which are useful for things like secure communication and secret sharing. Compared to older methods, their approach uses fewer qubits and simpler steps, making it easier to handle large networks. They tested their idea using a simulator called NetSquid, and the results showed it works well for practical quantum communication.
Authors
Chun-Hsiang Wang, Chia-Wei Tsai
Abstract
This study proposes a novel scheme for distributing GHZ-equivalent states across repeater-based quantum networks, with particular focus on the analysis and mitigation of decoherence effects during transmission. The proposed scheme enables remote users to share graph states, which can be leveraged to implement various quantum communication protocols, such as quantum key distribution and quantum secret sharing. Compared with existing approaches, the proposed distributed scheme requires only O(N) qubits without introducing redundant entanglement structures. Together with the linear-scaling merging procedure in both controlled gate count and qubit usage, the proposed framework supports more efficient large-scale graph state distribution. To evaluate its feasibility and correctness, this study utilizes the quantum network simulation tool, NetSquid, to implement the proposed scheme. Simulation results demonstrate that the proposed approach is both effective and practical for executing quantum communication protocols within quantum networks.