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相关概念视频

Superconductor01:24

Superconductor

1.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Fermi Level Dynamics01:12

Fermi Level Dynamics

229
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
229
Types Of Superconductors01:28

Types Of Superconductors

959
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

906
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
906
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

379
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
379
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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相关实验视频

Updated: Jun 19, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Published on: August 2, 2019

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在超导量子位上动态生成无脱凝的子空间和子系统.

Gregory Quiroz1,2, Bibek Pokharel3,4, Joseph Boen1

  • 1Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, United States of America.

Reports on progress in physics. Physical Society (Great Britain)
|July 26, 2024
PubMed
概括
此摘要是机器生成的。

研究人员在量子处理器上使用动态解 (DD) 实验证明了无脱节性子系统 (DFS) 逻辑量子比特. 与单独DD相比,这种方法提高了23%的量子状态保存保真度,提高了计算精度.

关键词:
量子控制是一种量子控制.量子错误的纠正 量子错误的纠正量子错误抑制可以抑制量子错误.

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科学领域:

  • 量子信息科学 量子信息科学
  • 量子计算是一种量子计算.
  • 量子错误纠正方法 量子错误纠正方法

背景情况:

  • 无脱凝的子空间和子系统 (DFS) 通过将量子信息编码到对称性保护状态中来保护量子信息,从而抵抗环境噪声.
  • 实验系统可能缺乏固有的DFS,需要引发它们的方法.
  • 动态解 (DD) 是一种技术,用于通过应用控制脉冲的序列来减轻脱节.

研究的目的:

  • 首次通过实验证明动态解产生的无脱节的子系统逻辑量子比特.
  • 调查DFS代码在超导量子处理器上保存量子信息方面的性能.
  • 评估DFS逻辑量子比特所提供的忠实性改进,与DD下的物理量子比特相比.

主要方法:

  • 使用IBM量子超导处理器来实现两位和三位量子比特DFS代码.
  • 采用动态解 (DD) 技术来设计支持DFS的对称性.
  • 结合DD与错误检测机制来评估DFS逻辑量子比特的性能.

主要成果:

  • 在DFS逻辑量子比特的状态保存忠实度上实现了高达23%的改进,而不是仅仅接受DD的物理量子比特.
  • 对于 DFS 编码的量子比特来说,已经证明了超出平衡的忠实度改进,这意味着取得了重大进展.
  • 研究的DFS代码包括多达6和7个不相互作用的逻辑量子比特.

结论:

  • 动态脱可以有效地用于生成量子信息编码的无脱子系统.
  • 在量子处理器中,DFS代码为提高量子处理器的计算精度提供了一个有希望的途径.
  • 实验演示验证了DFS代码对于强大的量子计算的潜在实用性.