Entangling and squeezing atoms by weak measurement

A weak measurement approach is proposed to entangle and squeeze atoms. We show that even for very small coupling strength between light and atoms, one can achieve large squeezing unattainable with normal measurement-based squeezing. Post-selecting the photons interacting with spins via a weak off-re...

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Bibliographic Details
Published inarXiv.org
Main Authors Wang, Mingfeng, Qu, Weizhi, Han, Bao, Li, Pengxiong, Xiao, Yanhong
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 30.12.2018
Subjects
Compressing
Entanglement
Photons
Process parameters
Quantum nondemolition
Twisting
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Summary:A weak measurement approach is proposed to entangle and squeeze atoms. We show that even for very small coupling strength between light and atoms, one can achieve large squeezing unattainable with normal measurement-based squeezing. Post-selecting the photons interacting with spins via a weak off-resonant quantum nondemolition interaction (QND) in a state nearly orthogonal to its initial state can strengthen the entanglement among elementary spins and thus enhance spin squeezing. The squeezing process is probabilistic but the created state is unconditionally determined. Further control of the post-selection parameter and the detection process can transform the QND-like spin squeezing into the one-axis-twisting or even two-axis-twisting type.
ISSN:2331-8422