Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains

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Date: 
2016-03-07
Author(s): 

H. Schempp, G. Günter, S. Wüster, M. Weidemüller and S. Whitlock

Reference: 

Phys. Rev. Lett. 115, 093002 (2015)

We investigate the transport of excitations through a chain of atoms with nonlocal dissipation introduced through coupling to additional short-lived states. The system is described by an effective spin-1/2 model where the ratio of the exchange interaction strength to the reservoir coupling strength determines the type of transport, including coherent exciton motion, incoherent hopping, and a regime in which an emergent length scale leads to a preferred hopping distance far beyond nearest neighbors. For multiple impurities, the dissipation gives rise to strong nearest-neighbor correlations and entanglement. These results highlight the importance of nontrivial dissipation, correlations, and many-body effects in recent experiments on the dipole-mediated transport of Rydberg excitations.