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Quantum spin dynamics, coherences, and entanglement in long range interacting systems

Friday March 10, 2017
4:00 pm

 Presenter:  Ana Maria Rey
 Series:  Physics and Astronomy Colloquium
 Abstract:  One of the most important goals of modern quantum sciences is to learn how to control and entangle many-body systems and use them to make powerful and improved quantum devices, materials and technologies. However, as the size of quantum systems grow, it becomes extremely challenging to identify, and quantify the buildup of entanglement. In this colloquium I will discuss recent accomplishments for modeling and benchmarking experiments that aim to use planar arrays of trapped ions for quantum simulations of long-range spin models. In those experiments strong spin-spin interactions can be mediated by the phonons of the crystal. I will report on current efforts to develop protocols that can quantify the build-up quantum correlations and storage of quantum information starting from easily prepared uncorrelated states. These include measurements of the spin depolarization, spin squeezing and the Fisher information. I will also discuss a new measurement
scheme, implemented by using a many-body echo sequence that reverses the Hamiltonian dynamics, which can give experimental access to a type of out-of-time-order correlations that capture the "scrambling" of quantum information across the system's many-body degrees of freedom. The capability to implement those protocols in controllable atomic laboratories opens a path towards their use for diverse applications ranging from quantum information processing and quantum enhanced metrology to studies of quantum chaos, quantum phase transitions, and criticality
 Host:  Ivan Deutsch
 File:  http://panda3.phys.unm.edu:/videos/Colloquium-170310-Rey.mp4
 Location:  Room 125, Dane Smith Hall

Refreshments will be available before the colloquium, at 03:45 pm, in in the lobby of Dane Smith Hall.

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