I.
Cohen
Senko, C. ., Richerme, P. ., Smith, J. ., Lee, A. ., Cohen, I. ., Retzker, A. ., & Monroe, C. . (2015). Realization of a Quantum Integer-Spin Chain with Controllable Interactions. Physical Review X, 5. http://doi.org/10.1103/PhysRevX.5.021026
Cohen, I. ., Richerme, P. ., Gong, Z. X., Monroe, C. ., & Retzker, A. . (2015). Simulating the Haldane phase in trapped-ion spins using optical fields. Physical Review A, 92. http://doi.org/10.1103/PhysRevA.92.012334