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関連する概念動画

Types Of Superconductors01:28

Types Of Superconductors

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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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Superconductor01:24

Superconductor

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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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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.2K
Zeroth Law of Thermodynamics01:14

Zeroth Law of Thermodynamics

5.6K
Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium.
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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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...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

478
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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超伝導プロセッサのトポロジカル・プレサーミック・フォート・ゼロモード

Feitong Jin1, Si Jiang2,3, Xuhao Zhu1

  • 1School of Physics, ZJU-Hangzhou Global Scientific and Technological Innovation Center, and Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou, China.

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まとめ

研究者らは,限られた温度で持続する超伝導クビットの新しいトポロジカル・エッジモードを観察しました. これらの堅牢で長寿命のモードは 量子ビットとして使用され 乱れのないシステムにおける量子コンピューティングの 新しい経路を提供できます

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科学分野:

  • 凝縮物質物理学
  • 量子情報科学
  • 量子シミュレーション

背景:

  • 対称性の保護されたトポロジカルフェーズは,局所的な順序パラメータがなく,熱刺激により有限な温度では通常不安定である.
  • 従来の理解では,トポロジカルエッジモードの安定性はゼロ温度に制限され,実用的な応用が制限されます.
  • 乱れのないシステムは 堅牢な量子計算に不可欠ですが トポロジカルな保護には 通常低い温度が必要です

研究 の 目的:

  • 新興対称性によって保護される新しいタイプのトポロジカル・エッジモードを観察し,特徴づけること.
  • 限られた温度でスペクトル全体にわたってこれらのエッジモードの持続性を実証する.
  • これらのトポロジカル・エッジ・モードを 乱れのないシステムで 頑丈で長寿命の量子ビットとして活用する

主な方法:

  • 100個のプログラム可能な超伝導量子ビットの配列を用いた 1 次元の無乱定のハミルトン量子シミュレーション.
  • 多様な初期状態に対する長期間の (最大30サイクル) トポロジカル・エッジモードの観測.
  • 安定剤の強さの二極化によってエッジモードと大量刺激の相互作用を抑制し,新興のU(1) × U(1) 対称性を明らかにする.

主要な成果:

  • 固い,長寿命のトポロジカル・エッジ・モードの観測は,出現シンメトリーによって保護され,スペクトル全体で有限な温度で持続します.
  • これらのトポロジカル・エッジ・モードをクビットとして用いて準備した論理的なベル状態における持続的なコヘランスの実証.
  • エッジモードの安定性は,有限な温度でも混乱のないシステムで達成可能であることを確認します.

結論:

  • この研究は,有限な温度でトポロジカルな物質を研究するための実行可能なデジタルシミュレーションアプローチを確立しています.
  • 新興の対称性や熱前状態は,乱れのないシステムで堅牢で長寿命のトポロジカル・エッジモードの作成を可能にします.
  • これらの発見は,量子コンピューティングアプリケーションのための堅牢な境界量子ビットを構築するための有望な経路を示しています.