Reviving a quantum spin chain

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Science  26 Jan 2018:
Vol. 359, Issue 6374, pp. 408
DOI: 10.1126/science.359.6374.408-b

Quantum systems evolve in time but are expected to experience periodic “revivals”—returns to near-initial state—whose period depends on the energy spectrum of the system. The more complex the spectrum, the longer the period, which makes revivals tricky to observe in systems with long-range interactions. Zeiher et al. used a long-range interacting spin chain of 10 ultracold atoms optically “dressed” to a Rydberg state to observe the revivals of magnetization up to very long times. The findings may form the foundation for the use of Rydberg atoms in quantum annealing and similar protocols.

Phys. Rev. X 7, 041063 (2017).

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