Vacuum spin squeezing
Author(s)
Hu, Jiazhong; Chen, Wenlan; Vendeiro, Zachary Michael; Urvoy, Alban Joseph; Braverman, Boris; Vuletic, Vladan; ... Show more Show less
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We investigate the generation of entanglement (spin squeezing) in an optical-transition atomic clock through the coupling to an optical cavity in its vacuum state. 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, without any light applied. This scheme reveals that even an electromagnetic vacuum can constitute a useful resource for entanglement and quantum manipulation. By rotating the spin direction while coupling to the vacuum, the scheme can be extended to implement two-axis twisting resulting in stronger squeezing.
Date issued
2017-11Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Physical Review A
Publisher
American Physical Society
Citation
Hu, Jiazhong, et al. “Vacuum Spin Squeezing.” Physical Review A, vol. 96, no. 5, Nov. 2017. © 2017 American Physical Society
Version: Final published version
ISSN
2469-9926
2469-9934