English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Atomic spin-wave (SW) memory is a building block for quantum repeater.However, due to decoherence caused by atomic motions and magnetic-fieldgradients, SW retrieval efficiency decays with storage time. Slowmagnetic-field fluctuations (SMFFs) lead to shot-to-shot phase noises of SWs,but have not been considered in previous repeater protocols. Here, we develop aSW model including a homogeneous phase noise caused by SMFFs, and then revealthat such phase noise induces decoherence of single-excitation entanglementbetween two atomic ensembles in a repeater link. For verify this conclusion, weexperimentally prepare single-excitation entanglement between two SWs in a coldatomic ensemble and observe entanglement decoherence induced by SMFFs. Limitedby SMFFs, the evaluated lifetime of the single-excitation entanglement over arepeater link is ~135 ms, even if the link uses optical-lattice atoms as nodes.We then present an approach that may overcome such limitation and extend thislifetime to ~1.7 s.

Decoherence of Single-Excitation Entanglement over DLCZ Quantum Networks Caused by Slow-Magnetic-Field Fluctuations and Protection Approach