Optimal frequency measurements with maximally correlated states

1996 ◽  
Vol 54 (6) ◽  
pp. R4649-R4652 ◽  
Author(s):  
J. J . Bollinger ◽  
Wayne M. Itano ◽  
D. J. Wineland ◽  
D. J. Heinzen
Keyword(s):  
Optimal Frequency ◽  
Frequency Measurements

scholarly journals Optimal frequency measurements with quantum probes

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Simon Schmitt ◽  
Tuvia Gefen ◽  
Daniel Louzon ◽  
Christian Osterkamp ◽  
Nicolas Staudenmaier ◽  
...  
Keyword(s):  
Frequency Estimation ◽  
Frequency Discrimination ◽  
Quantum Limit ◽  
Resonance Spectroscopy ◽  
Optimal Frequency ◽  
Frequency Sensitivity ◽  
Frequency Measurements ◽  
Estimation Problems ◽  
Quantum Strategies ◽  
Fourier Limit

AbstractPrecise frequency measurements are important in applications ranging from navigation and imaging to computation and communication. Here we outline the optimal quantum strategies for frequency discrimination and estimation in the context of quantum spectroscopy, and we compare the effectiveness of different readout strategies. Using a single NV center in diamond, we implement the optimal frequency discrimination protocol to discriminate two frequencies separated by 2 kHz with a single 44 μs measurement, a factor of ten below the Fourier limit. For frequency estimation, we achieve a frequency sensitivity of 1.6 µHz/Hz2 for a 1.7 µT amplitude signal, which is within a factor of 2 from the quantum limit. Our results are foundational for discrimination and estimation problems in nanoscale nuclear magnetic resonance spectroscopy.

Robust and Resilient Distributed Optimal Frequency Control for Microgrids Against Cyber Attacks

2021 ◽  
pp. 1-1
Author(s):  
Yun Liu ◽  
Yuanzheng Li ◽  
Yu Wang ◽  
Xian Zhang ◽  
Hoay Beng Gooi ◽  
...  
Keyword(s):  
Frequency Control ◽  
Cyber Attacks ◽  
Optimal Frequency

scholarly journals Frequency of Routine Testing for Coronavirus Disease 2019 (COVID-19) in High-risk Healthcare Environments to Reduce Outbreaks

2020 ◽  
Author(s):  
Elizabeth T Chin ◽  
Benjamin Q Huynh ◽  
Lloyd A C Chapman ◽  
Matthew Murrill ◽  
Sanjay Basu ◽  
...  
Keyword(s):  
High Risk ◽  
Simulation Modeling ◽  
Optimal Frequency ◽  
Routine Testing ◽  
Testing Strategies ◽  
Healthcare Environments ◽  
Viral Testing

Abstract Routine asymptomatic testing strategies for COVID-19 have been proposed to prevent outbreaks in high-risk healthcare environments. We used simulation modeling to evaluate the optimal frequency of viral testing. We found that routine testing substantially reduces risk of outbreaks, but may need to be as frequent as twice weekly.

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