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This Week at Physics

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Events on Tuesday, October 16th, 2018

Atomic Physics Seminar
Exploring quantum many-body dynamics and quantum information processing with reconfigurable arrays of atoms
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Prof. Hannes Bernien, University of Chicago
Abstract: Controllable, coherent quantum many-body systems can provide insights into fundamental properties of quantum matter, enable the realization of exotic quantum phases, and ultimately offer a platform for quantum information processing that could surpass any classical approach. Recently, reconfigurable arrays of neutral atoms with programmable Rydberg interactions have become promising systems to study such quantum many-body phenomena, due to their isolation from the environment, and high degree of control. Using this approach, we demonstrate high fidelity manipulation of individual atoms and entangled atomic states. Furthermore, we realize a programmable Ising-type quantum spin model with tunable interactions and system sizes up to 51 qubits. Within this model, we observe transitions into ordered states that break various discrete symmetries. Varying the rate at which the quantum phase transition is crossed allows us to observe the power-law scaling of the correlation length, as predicted by the Kibble-Zurek mechanism. The scaling exponent observed is consistent with theoretical predictions for the Ising universality class when sweeping into a Z2-ordered phase, and with the 3-state Chiral Clock Model for transitions into the Z3-ordered phase. An alternative, hybrid approach for engineering interactions is the coupling of atoms to nanophotonic structures in which guided photons mediate interactions between atoms. I will discuss our progress towards entangling two atoms that are coupled to a photonic crystal cavity and outline the exciting prospects of scaling these systems to many qubits and to quantum networks over large distances.
Host: Saffman
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Chaos & Complex Systems Seminar
Renewable energy: A viable path forward
Time: 12:05 pm
Place: 4274 Chamberlin (Refreshments will be served)
Speaker: Michael Winokur, UW Department of Physics
Abstract: The rate of growth in renewable energy production has generally exceeded even the most optimistic projections. This dramatic scenario has been driven by a steady stream of technological advancements in combination with a breathtaking reduction in actual the cost of the energy production. Many traditional sources of energy are becoming economically uncompetitive. This introductory level talk will give a broad overview of the potential sources of renewable energy with an emphasis on the recent history of solar and wind energy production and likely near-term developments which will further improve device performance. Time permitting some of the issues associated with energy storage will be discussed.
Host: Clint Sprott
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