Quantum Repeater for W states

Abstract

W states are a valuable resource for various quantum information tasks, and several protocols to generate them have been proposed and implemented. We introduce a quantum repeater protocol to efficiently distribute three-qubit W states over arbitrary distances in a 2D triangular quantum network with polylogarithmic overhead, thereby enabling these applications between remote parties. The repeater protocol combines two ingredients that we establish: probabilistic entanglement swapping with three copies of three-qubit W states to a single long-distance three-qubit W state, and an improved entanglement purification protocol. The latter not only shows a better performance, but also an enlarged purification regime as compared to previous approaches. We show that the repeater protocol allows one to deal with errors resulting from imperfect channels or state preparation, and noisy operations, and we analyze error thresholds, achievable fidelities and overheads.

8 pages, 5 figures and 1 table

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Cited by in corpus (11)

• Stabilizer Entanglement Distillation and Efficient Fault-Tolerant Encoders
• Imperfect quantum networks with tailored resource states
• Symmetric quantum states: a review of recent progress
• Improving entanglement purification through coherent superposition of roles
• Efficient generation of multiqubit entanglement states using rapid adiabatic passage
• Teleportation fidelity of quantum repeater networks
• Rapid Preparation of Rydberg Superatom W State Using Superadiabatic Techniques
• Tripartite entanglement and tripartite steering in three-qubit pure states induced by vacuum--one-photon superpositions
• Linear Optical Schemes to Postselect High-Dimensional Dicke States
• Entanglement dynamics in minimal Kitaev chains
• Basic entanglement distillation with realistic noise