讲座题目：Universal distribution of topological defects and adiabatic quantum computation
主讲人：Prof..Adolfo del Campo
主持人：武海斌教授
讲座时间：2019.4.15上午09:30
讲座地点：理科大楼A814室
报告摘要：
When a quantum phase transition is crossed in finite time, critical slowing down leads to the breakdown of adiabatic dynamics and the formation of topological defects. The average density of defects scales with the quench rate following a universal power-law predicted by the Kibble-Zurek mechanism. We analyze the full counting statistics of kinks and report the exact kink number distribution in the transverse field quantum Ising model. Kink statistics is described by the Poisson binomial distribution with all cumulants exhibiting a universal power-law scaling with the quench rate. In the absence of finite-size effects, the distribution approaches a normal one, a feature that is expected to apply broadly in systems described by the Kibble-Zurek mechanism. We shall discuss the implications of such universal signatures on the dynamics of quantum annealing and the performance of adiabatic quantum computers.
Refs.:
Adolfo del Campo, Universal Statistics of Topological Defects Formed in a Quantum Phase Transition, Phys. Rev. Lett. 121, 200601 (2018)
Jin-Ming Cui, Fernando Javier Gómez-Ruiz, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Adolfo del Campo,Testing quantum critical dynamics beyond the Kibble-Zurek mechanism with a trapped-ion simulator, arXiv:1903.02145
Zhenyu Xu, Adolfo del Campo, Probing the full distribution of many-body observables by single-qubit interferometry, arXiv:1812.06983
报告人简介：
Positions
19-University of Basque Country and Donostia International Physics Center
kerbasque research professor
18-Los Alamos National Laboratory, Theoretical division,T-4
faculty guest scientist
18-University of Massachusetts Boston, Department of Physics
tenured associate professor
14-University of Massachusetts Boston, Department of Physics
tenure-track associate professor
11-14 Los Alamos National Laboratory, Theoretical division,T-4&Center for Non-Linear Studies
J. Robert Oppenheimer fellow
11-11Leibniz Universität Hannover, Institut für Theoretische Physik
research associate
09-11 Universität Ulm,Institut für Theoretische Physik
research associate
08-09 Imperial College London, Blackett Laboratory&Institute for Mathematical Sciences
research associate
07-08 Basque Country University, QUINST, Department of Physical Chemistry
research associate
Education
04-08 PhD,University of Basque Country(Bilbao, Spain)
99-04 Bachelor’s degree,University of Basque Country(Bilbao, Spain)