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Updated: Jun 18, 2025

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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在一个不可整合的方块量子电路中,强大的有效基态.
Tatsuhiko N Ikeda1,2, Sho Sugiura3,4,5, Anatoli Polkovnikov2
1<a href="https://ror.org/02tt21044">RIKEN Center for Quantum Computing</a>, Wako, Saitama 351-0198, Japan.
Physical review letters
|August 2, 2024
概括
由周期性Floquet驱动器驱动的量子系统可能并不总是达到无限温度. 一个被的Ising链的基本状态显示出对加热的异常强度,可能形成长期存在的Floquet相.
科学领域:
- 量子多体物理学 量子多体物理学
- 量子热力学就是量子热力学.
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 外部周期驱动器 (Floquet驱动器) 理论上可以将通用孤立量子系统驱动到无特征的无限温度状态.
- 支持或反驳这种普遍加热假设的证据有限,特别是对于不可集成的系统.
研究的目的:
- 在一个不可整合的量子系统中研究Floquet加热的初始状态依赖性.
- 确定某些初始状态是否可以避免在周期性驾驶下达到无限温度状态.
主要方法:
- 利用一个高效的量子电路模拟器来研究一个不可集成的被的Ising链.
- 模拟不同长度的系统,长度可达L=30.
主要成果:
- 观察到有效的Floquet Hamiltonian的基本状态表现出对加热的特殊强度.
- 这种基本状态可以保持有限的能量密度,即使在无限的Floquet循环之后,如果驾驶周期低于一个值.
- 这种能量局部化过渡或交叉对于通用兴奋状态而言没有观察到.
结论:
- 基态的稳定性归因于它的光谱隔离和高能态的非典型性质.
- 这些发现挑战了Floquet加热到无限温度的普遍性.
- 通过初始状态工程为设计Floquet协议铺平了道路,通过初始状态工程来设计寿命长的Floquet相.
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