Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.010405
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Funding
- National Science Foundation [PHY-1506401]
- Research Corporation Cottrell Scholars Program
- National Science Foundation Graduate Research Fellowship Program
- Hertz Foundation
- Max Weber Foundation
- Air Force Office of Scientific Research
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We report direct observations of photon-mediated spin-exchange interactions in an atomic ensemble. Interactions extending over a distance of 500 mu m are generated within a cloud of cold rubidium atoms coupled to a single mode of light in an optical resonator. We characterize the system via quench dynamics and imaging of the local magnetization, verifying the coherence of the interactions and demonstrating optical control of their strength and sign. Furthermore, by initializing the spin-1 system in the m(f) = 0 Zeeman state, we observe correlated pair creation in the m(f) = +/- 1 states, a process analogous to spontaneous parametric down-conversion and to spin mixing in Bose-Einstein condensates. Our work opens new opportunities in quantum simulation with long-range interactions and in entanglement-enhanced metrology.
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