Unification of random dynamical decoupling and the quantum Zeno effect

Alexander Hahn*, Daniel Burgarth, Kazuya Yuasa

*この研究の対応する著者

研究成果: Article査読

抄録

Periodic deterministic bang-bang dynamical decoupling and the quantum Zeno effect are known to emerge from the same physical mechanism. Both concepts are based on cycles of strong and frequent kicks provoking a subdivision of the Hilbert space into independent subspaces. However, previous unification results do not capture the case of random bang-bang dynamical decoupling, which can be advantageous to the deterministic case but has an inherently acyclic structure. Here, we establish a correspondence between random dynamical decoupling and the quantum Zeno effect by investigating the average over random decoupling evolutions. This protocol is a manifestation of the quantum Zeno dynamics and leads to a unitary bath evolution. By providing a framework that we call equitability of system and bath, we show that the system dynamics under random dynamical decoupling converges to a unitary with a decoupling error that characteristically depends on the convergence speed of the Zeno limit. This reveals a unification of the random dynamical decoupling and the quantum Zeno effect.

本文言語English
論文番号063027
ジャーナルNew Journal of Physics
24
6
DOI
出版ステータスPublished - 2022 6月 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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