Quantum Repeater for W states
- URL: http://arxiv.org/abs/2304.06757v2
- Date: Wed, 8 Nov 2023 18:49:38 GMT
- Title: Quantum Repeater for W states
- Authors: Jorge Miguel-Ramiro, Ferran Riera-S\`abat, Wolfgang D\"ur
- Abstract summary: We introduce a quantum repeater protocol to efficiently distribute three-qubit W states over arbitrary distances.
We show that the protocol allows one to deal with errors resulting from imperfect channels or state preparation, and noisy operations.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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