Vacuum spin squeezing
| Autor: | Boris Braverman, Alban Urvoy, Wenlan Chen, Jiazhong Hu, Vladan Vuletic, Zachary Vendeiro |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Quantum Physics QED vacuum Atomic Physics (physics.atom-ph) Vacuum state FOS: Physical sciences Quantum entanglement 01 natural sciences Physics - Atomic Physics 010305 fluids & plasmas Excited state Quantum mechanics 0103 physical sciences Atom Quantum Physics (quant-ph) 010306 general physics Ground state Quantum Spin-½ |
| Zdroj: | Physical Review A. 96 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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