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Propagation of information in long range interacting quantum systems

Event Details

Event Dates: 

Friday, February 28, 2014 - 4:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Zhexuan Gong

Speaker Affiliation(s): 

Joint Quantum Institute
Seminar Type/Subject

Event Details & Abstract: 

Propagation of information in short-range interacting systems is restricted to within a linear "light cone", as proven by the well-known Lieb-Robinson bound, thus ensuring a well defined notion of locality. Whether long-ranged interactions can lead to a different shape of this light cone, and the breakdown of the associated notion of locality, is an important but largely unexplored question. I will describe recent trapped-ion experiments which have observed nonlocal propagation of correlations in certain long-ranged interacting spin models, and will discuss our theoretical efforts to understand how, as the interaction range shrinks, locality is recovered.