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Direct demonstration of spin-squeezing-induced metrological enhancement on state-of-the-art optical atomic clocks

Jingbiao Chen, Deshui Yu

中国科学通报：英文版Apr 1, 20246 citations

Long-lived spin squeezing in a trapped-atom clock on a chip

Jakob Reichel

SPIE Quantum TechnologiesJun 3, 20220 citations

Progress toward a spin squeezed optical atomic clock beyond the standard quantum limit

Boris Braverman, Akio Kawasaki, Vladan Vuletić

Bulletin of the American Physical SocietyJun 11, 20150 citations

Spin squeezing dynamics and large-spin analogues in an optical lattice clock

Michael A. Perlin, Ana María Rey

Bulletin of the American Physical SocietyMar 4, 20200 citations

Toward self spin-squeezing in a BEC clock

Théo Laudat, Vincent Dugrain, Carlos L. Garrido Alzar +2 more

Apr 4, 20160 citations

Impact of non-unitary spin squeezing on atomic clock performance

Boris Braverman, Akio Kawasaki, Vladan Vuletić

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.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.

arXiv:1806.02161New Journal of PhysicsOct 1, 201835 citations

Toward Unitary Spin Squeezing for Atomic Clocks

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