Impact of non-unitary spin squeezing on atomic clock performance

Spin squeezing is a form of entanglement that can improve the stability of quantum sensors operating with multiple particles, by inducing inter-particle correlations that redistribute the quantum projection noise. Previous analyses of potential metrological gain when using spin squeezing were perfor...

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Bibliographic Details
Published inNew journal of physics Vol. 20; no. 10; pp. 103019 - 103030
Main Authors Braverman, Boris, Kawasaki, Akio, Vuleti, Vladan
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 12.10.2018
Subjects
antisqueezing
Atomic clocks
Atoms & subatomic particles
Clocks & watches
Compressing
Entangled states
Experiments
Laboratories
Noise
Physics
precision sensors
Quantum entanglement
Quantum sensors
Sensors
Spectrum analysis
spin squeezing
Stability
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Summary:Spin squeezing is a form of entanglement that can improve the stability of quantum sensors operating with multiple particles, by inducing inter-particle correlations that redistribute the quantum projection noise. Previous analyses of potential metrological gain when using spin squeezing were performed on theoretically ideal states, without incorporating experimental imperfections or inherent limitations which result in non-unitary quantum state evolution. Here, we show that potential gains in clock stability are substantially reduced when the spin squeezing is non-unitary, and derive analytic formulas for the clock performance as a function of squeezing, excess spin noise, and interferometer contrast. Our results highlight the importance of creating and employing nearly pure entangled states for improving atomic clocks.
Bibliography:NJP-108861.R1
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/aae563