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5 March 2021 Spin-squeezing by prediction and retrodiction measurements: beyond the Heisenberg uncertainty relation
Han Bao, Shenchao Jin, Junlei Duan, Xingda Lu, Pengxiong Li, Weizhi Qu, Mingfeng Wang, Irina Novikova, Eugeniy Mikhailov, Kaifeng Zhao, Suotang Jia, Klaus Mølmer, Heng Shen, Yanhong Xiao
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Proceedings Volume 11700, Optical and Quantum Sensing and Precision Metrology; 117000O (2021) https://doi.org/10.1117/12.2586729
Event: SPIE OPTO, 2021, Online Only
Abstract
If one has access to information about a quantum system both before and after a measurement, the usual remit of Heisenberg uncertainty relation (HUR) does not apply. Here, we theoretically and experimentally demonstrate that, in such a scenario, one can retrodict position and momentum measurements without being limited by HUR. The experiment uses a large ensemble of 10^11 atoms in a macroscopic vapor cell, and the results may be applicable for quantum state estimation and sensing, especially for sensitive magnetometers equally capable of measuring the amplitude and phase of an RF magnetic field both below the standard quantum limit.
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Han Bao, Shenchao Jin, Junlei Duan, Xingda Lu, Pengxiong Li, Weizhi Qu, Mingfeng Wang, Irina Novikova, Eugeniy Mikhailov, Kaifeng Zhao, Suotang Jia, Klaus Mølmer, Heng Shen, and Yanhong Xiao "Spin-squeezing by prediction and retrodiction measurements: beyond the Heisenberg uncertainty relation", Proc. SPIE 11700, Optical and Quantum Sensing and Precision Metrology, 117000O (5 March 2021); https://doi.org/10.1117/12.2586729
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KEYWORDS
Chemical species
Magnetism
Particles
Quantum mechanics
Rubidium
Time metrology
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