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相关概念视频

Deactivation Processes: Jablonski Diagram01:25

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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辐射随机单元电路中的混过渡.

Zack Weinstein1, Shane P Kelly2, Jamir Marino2

  • 1Department of Physics, University of California, Berkeley, California 94720, USA.

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|December 15, 2023
PubMed
概括
此摘要是机器生成的。

研究了量子信息混及其在环境中的传播. 发现了一个相位过渡,影响了辐射量子比特的信息解码.

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科学领域:

  • 量子信息科学 量子信息科学
  • 凝聚物质物理学 凝聚物质物理学
  • 量子计算是一种量子计算.

背景情况:

  • 量子信息杂乱描述了量子信息如何在量子系统内传播.
  • 了解开放量子系统中的信息动态对于量子技术至关重要.
  • 随机单元电路为研究复杂量子力学提供了一个模型.

研究的目的:

  • 为了研究量子信息在随机单元电路中与环境相互作用的杂乱.
  • 在量子信息动力学中识别和描述一个非平衡相位过渡.
  • 探索编码的信息理论后果和信息检索的阶段过渡.

主要方法:

  • 使用时间外顺序相关器 (OTOC) 来量化量子杂乱.
  • 分析一个随机的单元电路模型与可调的量子位环境交换率 (p).
  • 开发和应用一个解码方案来评估从辐射量子比特中恢复信息.

主要成果:

  • 在指向透普遍性类中的一个非平衡阶段过渡,在临界交换率 (p_c) 上.
  • 对于p < p_c,OTOC的弹道增长,表明系统内部的混.
  • 对于p > p_c,OTOC的统一消失,意味着信息传输到环境中.
  • 操作员扩散中的巧合过渡和从辐射量子比特解码初始量子信息的能力.
  • 基于交换量子比特的初始状态的连贯信息中纠过渡的观察.

结论:

  • 这项研究揭示了量子信息杂乱行为的关键转变.
  • 这种过渡直接影响了从环境中恢复初始量子信息的可能性.
  • 这些发现对理解开放量子系统和量子信息处理中的信息流产生影响.