Vacuum spin squeezing

We investigate the generation of entanglement (spin squeezing) in an optical-transition atomic clock through the coupling to a vacuum electromagnetic field that is enhanced by an optical cavity. We show that if each atom is prepared in a superposition of the ground state and a long-lived electronic...

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Bibliographic Details
Published inarXiv.org
Main Authors Hu, Jiazhong, Chen, Wenlan, Vendeiro, Zachary, Urvoy, Alban, Braverman, Boris, Vuletić, Vladan
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 07.03.2017
Subjects
Compressing
Coupling
Electromagnetic fields
Entanglement
Frequency control
Physics - Atomic Physics
Physics - Quantum Physics
Superposition (mathematics)
Twisting
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Summary:We investigate the generation of entanglement (spin squeezing) in an optical-transition atomic clock through the coupling to a vacuum electromagnetic field that is enhanced by an optical cavity. We show that if each atom is prepared in a superposition of the ground state and a long-lived electronic excited state, and viewed as a spin-1/2 system, then the collective vacuum light shift entangles the atoms, resulting in a squeezed distribution of the ensemble collective spin. This scheme reveals that even a vacuum field can be a useful resource for entanglement and quantum manipulation. The method is simple and robust since it requires neither the application of light nor precise frequency control of the ultra-high-finesse cavity. Furthermore, the scheme can be used to implement two-axis twisting by rotating the spin direction while coupling to the vacuum, resulting in stronger squeezing.
ISSN:2331-8422
DOI:10.48550/arxiv.1703.02439