西森秀稔

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127量子ビットのIBM Eagleプロセッサー上で、スピングラスのいわゆる「西森ライン」に相当するGHZ状態を測定ベースで生成し、その性質を解析した研究です。ノイズの影響を受ける大規模量子プロセッサーで、統計力学の理論と定量的に比較可能なデータを出した稀な例です。こちらの文献の内容です。

https://arxiv.org/abs/2309.02863 https://arxiv.org/abs/2208.11136

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日時:9月27日(水)17:00- (日本時間)

講演者:Dr. Guoyi Zhu (University of Cologne)

参加登録:https://bit.ly/3ZfZnps

Title: Nishimori's cat in a noisy quantum processor

Abstract: 

Traditionally, measurements have been synonymous with extracting information from physical systems. Yet in the quantum realm, the extraordinary nature of measurements allows them to actively modify and steer quantum states, forging a new route to entanglement generation. It has remained an open question whether these measurement-based state preparation protocols can lead to phases of matter which are stable to gate imperfections.
  In this talk I will focus on a shallow circuit targeting at the "hydrogen atom" of long-range entangled states - the Greenberger-Horne-Zeilinger state. We analytically find that its long range order is stable against certain coherent and incoherent errors, up to a finite threshold. The threshold is governed by a hidden Nishimori criticality, featuring a conspiracy of disorder and effective temperature enforced by the Born's rule. I will discuss our latest experimental implementation on an IBM 127-qubit quantum processor.