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Phase transitions and critical states of monitored quantum systems

日程 : 2021年11月1日(月) 10:00 - 12:00 場所 : https://sites.google.com/view/cevis2020/registration (We will send the zoom link to the registered participants) 講師 : Ehud Altman 所属 : UC Berkeley 世話人 : 押川正毅 (ex.63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp

In a closed system, thermalization occurs through unitary evolution, which encodes information in increasingly nonlocal degrees of freedom. Recent work on random quantum circuits has clarified how this non-local encoding is affected by an external observer: at a critical measurement rate the system undergoes a phase transition from an encoding state with volume law entanglement to an area law state. I will review the current understanding of the transition using a mapping to statistical mechanics models and use this description to predict two new phenomena. First, I will argue that large scale entanglement, with sub-volume critical power law scaling, is left in the monitored system when it is coupled to a decoherence channel at its edge. Second, I will show that the capacity of certain quantum circuits to facilitate quantum teleportation over infinite distances has a critical onset at a finite time.

Chair: Yuki Motome

This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)” https://sites.google.com/view/cevis2020/home

(公開日: 2021年10月28日)