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Condensed Matter > Statistical Mechanics
Title: Embedding the Yang-Lee Quantum Criticality in Open Quantum Systems
(Submitted on 24 Dec 2020 (v1), last revised 5 Jun 2022 (this version, v4))
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.
Submission history
From: Norifumi Matsumoto [view email][v1] Thu, 24 Dec 2020 07:08:55 GMT (277kb,D)
[v2] Sun, 27 Dec 2020 05:59:00 GMT (277kb,D)
[v3] Mon, 12 Jul 2021 15:20:57 GMT (574kb,D)
[v4] Sun, 5 Jun 2022 08:25:25 GMT (578kb,D)
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