%0 Generic %1 hu2017vacuum %A Hu, Jiazhong %A Chen, Wenlan %A Vendeiro, Zachary %A Urvoy, Alban %A Braverman, Boris %A Vuletić, Vladan %D 2017 %K cavity theory %T Vacuum spin squeezing %U http://arxiv.org/abs/1703.02439 %X 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.

@misc{hu2017vacuum, abstract = {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.}, added-at = {2017-11-21T18:05:20.000+0100}, author = {Hu, Jiazhong and Chen, Wenlan and Vendeiro, Zachary and Urvoy, Alban and Braverman, Boris and Vuletić, Vladan}, biburl = {https://www.bibsonomy.org/bibtex/2b9f34cf0df4b5feb351afda28d58026e/marschu}, interhash = {d686319e2a402715b2b4e89e8869dcd1}, intrahash = {b9f34cf0df4b5feb351afda28d58026e}, keywords = {cavity theory}, note = {cite arxiv:1703.02439}, timestamp = {2017-11-21T18:05:20.000+0100}, title = {Vacuum spin squeezing}, url = {http://arxiv.org/abs/1703.02439}, year = 2017 }