Programm für das Wintersemester 2020/2021
Thursdays, 16:00 Uhr s.t.
Die Dozierenden der Theoretischen Physik
12.11.20  Markus Heyl & Nicola Pancotti, MPKS, Dresden & Amazon Quantum  
We restart our series of theory colloquiums with a 90 minutes event on applications of machine learning to manybody physics. We will have two Zoom talks of 35 minutes+10 minutes of questions, each.
Talk 1 (M. Heyl): Quantum manybody dynamics in two dimensions with artificial neural networks
In the last two decades the field of nonequilibrium quantum manybody physics has seen a rapid development driven, in particular, by the remarkable progress in quantum simulators, which today provide access to dynamics in quantum matter with an unprecedented control. However, the efficient numerical simulation of nonequilibrium realtime evolution in isolated quantum matter still remains a key challenge for current computational methods especially beyond one spatial dimension. In this talk I will present a versatile and efficient machine learning inspired approach. I will first introduce the general idea of encoding quantum manybody wave functions into artificial neural networks. I will then identify and resolve key challenges for the simulation of realtime evolution, which previously imposed significant limitations on the accurate description of large systems and longtime dynamics. As a concrete example, I will consider the dynamics of the paradigmatic twodimensional transverse field Ising model, where we observe collapse and revival oscillations of ferromagnetic order and demonstrate that the reached time scales are comparable to or exceed the capabilities of stateoftheart tensor network methods.
Talk 2 (N. Pancotti): Neural Networks Quantum States, Tensor Networks and Machine Learning
Neural Networks Quantum States have been recently introduced as an Ansatz for describing the wave function of quantum manybody systems. In this talk I will give an overview of recent works on Neural Networks Quantum States taking the form of Boltzmann machines. I will explain the motivation for considering Boltzmann machines in machine learning and explain how they can be used to study ground state properties of quantum systems. I will then focus on the expressive power of this class of states and discuss their relationship to Tensor Networks. In particular I will show that restricted Boltzmann machines belong to an exotic class of tensor networks known as String Bond States. This mapping enables us to define generalizations of restricted Boltzmann machines that combine the entanglement structure of tensor networks with the efficiency of Neural Networks Quantum States. This connection sheds light on possible application of tensor networks in machine learning. I will discuss the tight relationship between tensornetwork techniques and probabilistic graphical models, an established class of models broadly used in computer science. I finally conclude by presenting possible advantages of using tensor network to tackle machine learning problems.  
16:00 Uhr s.t., usually NewtonRaum, Staudinger Weg 9, 01122, at Zoom  
double seminar 
zukünftige Termine
17.12.20  Matthew P. A. Fisher, UC Santa Barbara  
The inexorable growth of nonlocal quantum entanglement is the key feature that distinguishes quantum from classical systems. Monitoring an open system (by making projective measurements) can compete against entanglement growth, leading to a manybody quantum Zeno effect. A hybrid quantum circuit model consisting of both unitary gates and projective measurements exhibits a quantum dynamical phase transition between a weak measurement phase and a quantum Zeno phase. Detailed properties of the weak measurement phase  including relations to quantum error correcting codes  and of the critical properties of this novel quantum entanglement transition will be described.  
16:00 Uhr s.t., usually NewtonRaum, Staudinger Weg 9, 01122, at Zoom  

14.01.21  Dries Sels, New York University  
Recent technological advances have put us at the brink of having access to small scale quantum computers capable of solving problems that cannot be tackled with classical computers. A limited number of algorithms have been proposed and their relevance to real world problems is a subject of active investigation. Solving problems relevant to chemistry are expected to be the first successful applications of quantum computers. In this talk, I will discuss a particular problem that can be solved efficiently on quantum computers: model inference for nuclear magnetic resonance (NMR) spectroscopy. I will give a broad introduction to quantum computing and NMR metabolomics assuming no prior knowledge of the subject.  
16:00 Uhr s.t., usually NewtonRaum, Staudinger Weg 9, 01122, at Zoom  

11.02.21  N.N., N.N.  
TBA  
16:00 Uhr s.t., usually NewtonRaum, Staudinger Weg 9, 01122, at Zoom  

Koordination:  Kontakt: 
Prof. Dr. P.G.J. van Dongen  Elvira Helf 