Embedding the Yang-Lee Quantum Criticality in Open Quantum Systems
Statistical Mechanics
2022-06-07 v4 Quantum Physics
Abstract
The Yang-Lee edge singularity is a quintessential nonunitary critical phenomenon accompanied by anomalous scaling laws. However, an imaginary magnetic field involved in this critical phenomenon makes its physical implementation difficult. By invoking the quantum-classical correspondence to embed the Yang-Lee edge singularity in a quantum system with an ancilla qubit, we demonstrate a physical realization of the nonunitary quantum criticality in an open quantum system. Here the nonunitary criticality is identified with the singularity at an exceptional point caused by postselection of quantum measurement.
Cite
@article{arxiv.2012.13144,
title = {Embedding the Yang-Lee Quantum Criticality in Open Quantum Systems},
author = {Norifumi Matsumoto and Masaya Nakagawa and Masahito Ueda},
journal= {arXiv preprint arXiv:2012.13144},
year = {2022}
}
Comments
6 + 9 pages, 1 + 0 figure, 0 + 1 table