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関連する概念動画

Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

5.7K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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Damped Oscillations01:07

Damped Oscillations

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
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Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

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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....
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Effects of feedback01:24

Effects of feedback

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Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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量子フィードバックを用いた超伝導量子ビットにおけるラビ振動の安定化.

R Vijay1, C Macklin, D H Slichter

  • 1Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA. rvijay@berkeley.edu

Nature
|October 6, 2012
PubMed
まとめ

研究者は,超伝導量子ビットを制御するために弱い量子測定を用いて,その状態の継続的な追跡と制御を可能にしました. これは,量子フィードバック制御を実証し,非相関性を抑制し,量子エラー修正の道を開く.

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科学分野:

  • 量子物理学とは,量子物理学のことです.
  • 量子コンピューティング
  • 固体システム (Solid-State Systems) とは,固体状態システム (Solid-State Systems) とは,固体状態システム (Solid-State Systems) とは,固体状態システム (Solid-State Systems) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは,固体状態システム (Solid-State System) とは

背景:

  • 量子測定は通常,スーパーポジション状態を瞬時に崩壊させます.
  • 弱い測定は,段階的な状態の進化と継続的なモニタリングを可能にします.
  • 量子フィードバック制御は,量子状態の管理とエラーの軽減に不可欠です.

研究 の 目的:

  • 固体システムで量子フィードバック制御を実装する.
  • 弱連続測定を用いて脱合性の抑制を証明する.
  • 量子エラー補正と状態安定化における応用を探求する.

主な方法:

  • 超伝導クビットとマイクロ波腔に結合した超伝導クビットを利用する.
  • フォトン数が少ないマイクロ波パルスで穴を検知することで弱い測定を行う.
  • リアルタイム状態モニタリングのために,高帯域幅,量子ノイズ制限アンプを使用しています.

主要な成果:

  • ラビ振動を無限に維持することで量子フィードバック制御を成功裏に実証しました.
  • 量子状態の衰退 (無一貫性) を積極的に抑制する能力を示した.
  • 高精度,空洞測定による量子ビット状態のリアルタイム監視を達成しました.

結論:

  • 弱い連続測定は,効果的な量子フィードバック制御を可能にします.
  • このテクニックは,強固な量子エラー修正の経路を提供します.
  • 潜在的な応用には,量子状態の安定化,浄化,および絡み合いの生成が含まれます.