Sharp phase transitions in a small frustrated network of trapped ion spins.

@article{Lin2011SharpPT,
  title={Sharp phase transitions in a small frustrated network of trapped ion spins.},
  author={Guin-Dar Lin and Christopher R. Monroe and Luming Duan},
  journal={Physical review letters},
  year={2011},
  volume={106 23},
  pages={
          230402
        }
}
Sharp quantum phase transitions typically require a large system with many particles. Here we show that, for a frustrated fully connected Ising spin network represented by trapped atomic ions, the competition between different spin orders leads to rich phase transitions whose sharpness scales exponentially with the number of spins. This unusual finite-size scaling behavior opens up the possibility of observing sharp quantum phase transitions in a system of just a few trapped ion spins. 

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