3:45–4:45 pm
GCIS W301/303 929 E. 57th St.
Measurement induced phenomena in many-body quantum system
A novel aspect of recent experiments with quantum devices is that measurements can play an active role in preparing the state of the system, not just in diagnosing it. Unlike unitary evolution, the quantum collapse induced by local measurements can have a highly non-local impact on entangled quantum states, instantaneously destroying or creating new long-distance correlations. This can lead to surprising collective effects such as measurement induced criticality and new kinds of universal structures in the post-measurement wave-function. I will first review recent progress in understanding these phenomena using mappings to effective statistical mechanical models. Next, I will talk about the challenge of diagnosing the post measurement correlations experimentally. These correlations are so difficult to observe because they are conditioned on the outcome of many-measurements with exponentially small Born probability. I will preview a novel approach to resolve this post-selection problem by cross-correlating experimental data with results of classical computations.
Speaker: Prof. Ehud Altman, Dept. of Physics, University of California Berkeley
Host: Asst. Prof. Luca Delacrétaz, Dept. of Physics (lvd@uchicago.edu)
About the JFI Colloquium: The James Franck Institute Colloquium is a monthly event inviting distinguished scholars from research institutions around the globe to share creative, groundbreaking research at the intersection of chemistry, physics, and materials science. As an interdisciplinary institution, the JFI welcomes researchers and students from a wide variety of scientific disciplines to attend and partake in lively discussion. Colloquium speakers are nominated by JFI faculty and selected annually by the colloquium committee. Find the full calendar on the JFI website.