Details
| Original language | English |
|---|---|
| Article number | eadr1439 |
| Number of pages | 13 |
| Journal | Science advances |
| Volume | 10 |
| Issue number | 43 |
| Early online date | 23 Oct 2024 |
| Publication status | Published - Oct 2024 |
Abstract
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In: Science advances, Vol. 10, No. 43, eadr1439, 10.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - GHZ protocols enhance frequency metrology despite spontaneous decay
AU - Kielinski, Timm
AU - Schmidt, Piet O.
AU - Hammerer, Klemens
N1 - Publisher Copyright: Copyright © 2024 The Authors, some rights reserved;
PY - 2024/10
Y1 - 2024/10
N2 - 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.
AB - 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.
KW - quant-ph
KW - physics.atom-ph
UR - http://www.scopus.com/inward/record.url?scp=85207724189&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2406.11639
DO - 10.48550/arXiv.2406.11639
M3 - Article
VL - 10
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 43
M1 - eadr1439
ER -