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関連する概念動画

Constant Volume Calorimetry02:41

Constant Volume Calorimetry

Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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関連する実験動画

Updated: May 13, 2026

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

固体核磁気共振を用いた熱浴アルゴリズムによる冷却の実験実施

J Baugh1, O Moussa, C A Ryan

  • 1Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. baugh@iqc.ca

Nature
|November 25, 2005
PubMed
まとめ

研究者は,熱浴アルゴリズムによる冷却を使用して,量子ビット (qubits) の複数段階の冷却を実験的に実証しました. この量子情報処理の進歩は,故障耐性量子コンピュータの開発に不可欠です.

科学分野:

  • 量子情報科学とは,量子情報科学である.
  • 量子コンピューティング
  • 量子熱力学とは,量子熱力学である.

背景:

  • 量子力学は,効率的なアルゴリズムによる革命的な情報処理の可能性を秘めています.
  • 量子ビット (量子ビット) の初期化と補助量子ビットの維持は,故障耐性量子コンピューティングにとって極めて重要です.
  • キュービットからエントロピーを除去することは不可欠であり,ヒートバスのアルゴリズムによる冷却のようなオープンシステムの冷却プロトコルが重要な方法である.

研究 の 目的:

  • 熱浴アルゴリズムによる冷却を用いた量子システムの多段階冷却を実験的に実現する.
  • 量子コンピューティングのために,浴室温度以下でのクビット冷却の実現可能性を実証する.
  • 固体核磁共振量子ビットの操作を進めるために.

主な方法:

  • 核磁共振を用いた3量子ビットシステムにおける熱浴アルゴリズムによる冷却の実験的実現.
  • 量子ビットの繰り返し再極化により,スピンバスの有効な温度に達します.
  • 三量子ビットサブスペース内の論理操作を交互に変えて,サブバス温度冷却を達成します.

主要な成果:

  • 量子システムの多段階冷却は,熱浴アルゴリズム冷却によって成功しました.

さらに関連する動画

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

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Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy
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Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy

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関連する実験動画

Last Updated: May 13, 2026

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
11:11

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Published on: May 2, 2016

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy
09:01

Magnetic-, Acoustic-, and Optical-Triple-Responsive Microbubbles for Magnetic Hyperthermia and Pothotothermal Combination Cancer Therapy

Published on: May 22, 2020

  • 2番目の量子ビットは,スピンバスの効果温度以下に冷却された.
  • 固体核磁共振量子ビットに対する精密な制御を実証した.

    • 結論:

    • 多段階の熱浴アルゴリズムによる冷却の実験的実現は,故障耐性量子計算に向けた重要な一歩である.
    • この研究は,理論的提案を検証し,固体システムにおける量子ビット冷却の実践的な制御を実証しています.
    • 核磁共振量子ビットを操作する技術の進歩は,より複雑な量子情報処理作業の道を開く.