GHZ protocols enhance frequency metrology despite spontaneous decay

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Original languageEnglish
Article numbereadr1439
Number of pages13
JournalScience advances
Volume10
Issue number43
Early online date23 Oct 2024
Publication statusPublished - Oct 2024

Abstract

The use of correlated states and measurements promises improvements in the accuracy of frequency metrology and the stability of atomic clocks. However, developing strategies robust against dominant noise processes remains challenging. We address the issue of decoherence due to spontaneous decay and show that Greenberger-Horne-Zeilinger (GHZ) states, in conjunction with a correlated measurement and nonlinear estimation strategy, achieve gains comparable to fundamental bounds for ensembles of up to 40 atoms. This result is surprising since GHZ states do not provide any enhancement under dephasing noise compared to the standard quantum limit of uncorrelated states. The gain arises from a veto signal, which allows for the detection and mitigation of errors caused by spontaneous emission events. Through comprehensive Monte-Carlo simulations of atomic clocks, we demonstrate the robustness of the GHZ protocol.

Keywords

    quant-ph, physics.atom-ph

ASJC Scopus subject areas

Cite this

GHZ protocols enhance frequency metrology despite spontaneous decay. / Kielinski, Timm; Schmidt, Piet O.; Hammerer, Klemens.
In: Science advances, Vol. 10, No. 43, eadr1439, 10.2024.

Research output: Contribution to journalArticleResearchpeer review

Kielinski T, Schmidt PO, Hammerer K. GHZ protocols enhance frequency metrology despite spontaneous decay. Science advances. 2024 Oct;10(43):eadr1439. Epub 2024 Oct 23. doi: 10.48550/arXiv.2406.11639, 10.1126/sciadv.adr1439
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