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量子物質セミナー/ 阪大QIQB 共催:Taming Quantum Entanglement

日程 : 2019年3月28日(木) 4:00 pm - 5:00 pm 場所 : 物性研究所本館6階 第5セミナー室 (A615) 講師 : Prof. Matthew P. A. Fisher 所属 : University of California, Santa Barbara 世話人 : 押川正毅 (63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp

Non-local quantum entanglement – “spooky action at a distance” – is the key feature that distinguishes quantum from classical systems. The entanglement-entropy provides a measure of entanglement and for many-body systems is intimately connected to the thermal-entropy. Out of equilibrium, in a driven system or after a quantum quench, entanglement spreads ballistically with maximal entropy attained at long times – that is, complete disorder reigns. But not (always!) with life on earth! Why? In this talk I will discuss several different mechanisms to tame entanglement growth;
(i) by quenched disorder in systems exhibiting many-body localization,
(ii) by coupling light quantum particles to heavy (almost classical) particles, and
(iii) by “looking repeatedly” at the system (i.e. making projective measurements)-a many-body quantum Zeno effect.
In the latter case, I will explore a novel hybrid quantum circuit model consisting of both unitary gates and projective measurements, presenting evidence for a new quantum dynamical phase transition between a weak measurement phase and a quantum Zeno phase. Detailed steady-state and dynamic critical properties of this novel quantum entanglement transition will be described.

Matthew Fisher教授は超流動-絶縁体転移の先駆的研究など多くの業績で著名な物性理論家で、アメリカ物理学会 Oliver E. Buckley Condensed Matter Physics Prize (2015)などを受賞し、アメリカ芸術科学アカデミーおよび米国科学アカデミーの会員でもあります。大阪大学先導的学際研究機構量子情報・量子生命部門の設立に伴うキックオフシンポジウムで招待講演を行うためFisher教授が来日される機会に、量子エンタングルメントに関連する最近の研究について物性研で講演して頂く機会を設けました。


(公開日: 2019年03月20日)