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Thursday, June 19, 2014
12:30 PM - 1:30 PM
T-DO Conference Room

Quantum Lunch

Harnessing Quantum Systems with Long-Range Interactions

Alexey Gorshkov
National Institute of Standards and Technology

AMO (atomic, molecular, and optical) systems with long-range interactions, such as Rydberg atoms, polar molecules, and ions, are arguably the most controllable, tunable, and strongly interacting quantum systems. In this talk, we will begin by reviewing how precise control over such systems has recently opened a new paradigm for quantum computing and communication, entanglement generation, and engineering of new phases of matter. We will then focus on two topics. First, we will discuss our theoretical [1] and experimental [2] work on a medium, in which strong long-range interactions between Rydberg atoms is mapped onto strong interactions between photons. This work paves the way for the generation of a variety of nonclassical states of light, the implementation of photon-photon quantum gates, and the study of many-body phenomena with strongly correlated photons. Second, we will discuss our theoretical [3] and experimental (in an ion chain) [4] work on the bounds to how fast information can propagation in lattice systems with long-range interactions. In particular, the new bound that we derive [3] is expected to provide crucial insights into numerous equilibrium and non-equilibrium phenomena, including the generation of entanglement and topological order and the decay of correlations in gapped ground states.

[1] AVG et al, Phys. Rev. Lett. 107, 133602 (2011); AVG et al, Phys. Rev. Lett. 110, 153601 (2013); Bienias et al, arXiv:1402.7333.

[2] Peyronel et al, Nature 488, 57 (2012); Firstenberg et al, Nature 502, 71 (2013).

[3] Gong et al, arXiv:1401.6174.

[4] Richerme et al, arXiv:1401.5088, Nature, in press.

Host: Dibyendu Roy