本領域のセミナーシリーズとして、9月26日木曜日に東京大学本郷キャンパス伊藤研究室にて、蘆田研究室の星野真宏さんによるセミナーが開催されます。セミナー情報は下記です。

Speaker: Masahiro Hoshino (The University of Tokyo)
Date： 26th, Sep., 2024, (Thu.), 13:00～
Place：In-person: Room 413 in Faculty of Science Building No.1, The University of Tokyo

Title: Measurement and decoherence in quantum critical states
Abstract: The main goal of this seminar is to introduce our recent work on entanglement swapping in critical quantum spin chains [1]. Entanglement swapping is a phenomenon in which entanglement between initially independent systems is induced solely by measurements. To understand this phenomenon in critical states, we employ techniques from boundary conformal field theory. We will begin with a brief introduction to conformal field theory, a theory that describes critical states in its low-energy region. We will discuss how to calculate informational quantities such as entanglement entropy in these systems. Following this, we will review recent advancements in measurements and decoherence in critical states [2,3]. It is shown that quantum criticality can be affected by measurements and decoherence. Finally, we tackle the problem of entanglement swapping and obtain analytical results on the swapped entanglement.
[1] Hoshino, M., Oshikawa, M., & Ashida, Y. (2024). Entanglement swapping in critical quantum spin chains. arXiv preprint arXiv:2406.12377. [2] Garratt, S. J., Weinstein, Z., & Altman, E. (2023). Measurements conspire nonlocally to restructure critical quantum states. Physical Review X, 13(2), 021026. [3] Zou, Y., Sang, S., & Hsieh, T. H. (2023). Channeling quantum criticality. Physical Review Letters, 130(25), 250403.