Department Calendar

Thursday, March 1, 2018

Time Items
All day
 
11am
"Learning Quantum Emergence With AI"

"Learning Quantum Emergence With AI"

Date: 
Thu, 03/01/2018 - 11:15am
Location: 
Pupin Hall Theory Center, 8th Floor

** Thursday Theory Seminar at 11:15 AM **

Eun-Ah Kim

Cornell University

"Learning Quantum Emergence With AI"

The application of artificial neural network to central questions in the theory of quantum matter is a rapidly developing field. The insight driving the field is that the problems of theoretical interests are primarily those of regression in which an exponentially large volume of data must be condensed into a more accessible or meaningful form, e.g., labeled with phases. In this talk, I will review the state of this rapidly developing field. I will then showcase how my group built and taught neural networks to recognize topological phases, different non-equilibrium phases and universal features from scanning tunneling microscopy data. I will then discuss new insights from the synergy between human intelligence and artificial intelligence: the key to our success.

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03/01/2018 - 11:15am
 
12pm
"Quantum LEGOs: Building large quantum systems atom-by-atom"

"Quantum LEGOs: Building large quantum systems atom-by-atom"

Date: 
Thu, 03/01/2018 - 12:15pm
Location: 
705 Pupin Hall

Hannes Bernien

Harvard University

"Quantum LEGOs: Building large quantum systems atom-by-atom"

The realization of large-scale controlled quantum systems is an exciting frontier in modern physical science. In this talk, I will introduce a new approach based on cold atoms in arrays of optical tweezers. We use atom-by-atom assembly to deterministically prepare arrays of individually controlled cold atoms. A measurement and feedback procedure eliminates the entropy associated with the probabilistic trap loading and results in defect-free arrays of over 60 atoms [1]. Strong, coherent interactions are enabled by coupling to atomic Rydberg states. We realize a programmable Ising-type quantum spin model with tunable interactions and system sizes of up to 51 qubits. Within this model we observe transitions into ordered states (Rydberg crystals) that break various discrete symmetries, verify high-fidelity preparation of ordered states, and investigate dynamics across the phase transition in large arrays of atoms [2].

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 I will outline the exciting prospects of this approach for scaling the system to large distances in a quantum network.

[1] Science 354, 1024 (2016)
[2] Nature 551, 579 (2017)
 

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03/01/2018 - 12:15pm
 
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