Perimeter Institute for Theoretical Physics

摘 要：

Recent advances have defined nontrivial phases of matter in open quantum systems, such as many-body quantum states subject to environmental noise. In this work,we experimentally probe and characterize mixed-state phases on Quantinuum's H1 quantum computer using two measures: Renyi correlators and the coding performance of a quantum error-correcting code associated with the phase. As a concrete example, we probe the low-energy states of the critical transverse field Ising model under different dephasing noise channels. First, we employ shadow tomography to observe a newly proposed Renyi correlator in two distinct phases: one exhibiting power-law decay and the other long-ranged. Second, we investigate the decoding fidelity of the associated quantum error-correcting code using a variational quantum circuit, and we find that a shallow circuit is sufficient to distinguish the above-mentioned two mixed-state phases through the decoding performance quantified by entanglement fidelity. Our work is a proof of concept for the quantum simulation and characterization of mixed-state phases.

报告人简介：

Dr. Yijian Zou is a postdoctoral fellow at Perimeter Institute for Theoretical Physics. He received his Ph.D. in Physics from the University of Waterloo and has held research positions at Stanford University as a Q-FARM Postdoctoral Fellow and at Google X as a Research Intern. His research lies at the intersection of quantum information and quantum many-body physics, with a focus on entanglement-based characterization, tensor network simulation, and the experimental realization of quantum phases of matter. His recent work explores the definition, detection, and classification of mixed-state quantum phases, as well as their connections to quantum error correction and machine learning. Dr. Zou has published 26 papers, including 11 in Physical Review Letters, Physical Review X, SciPost Physics,and Nature Communications (under review). His work bridges theory, numerics, and experiment, aiming to build a unified framework for understanding many-body quantum phenomena in quantum simulators.

邀请人：廖海军（82649377）