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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Atomic Nuclei: Types of Nuclear Relaxation01:28

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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...
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光学的な原子時計のトランジションの絡み合い

Edwin Pedrozo-Peñafiel1, Simone Colombo1, Chi Shu1,2

  • 1Department of Physics, MIT-Harvard Center for Ultracold Atoms and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature
|December 17, 2020
PubMed
まとめ

研究者は,光学格子時計 (OLC) で多くの原子が絡み合っている状態を作り,標準量子限界 (SQL) を超える性能を達成しました. 量子計測学のこの突破は 原子時計の安定性と精度を 将来の科学的な応用のために高めています

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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科学分野:

  • 量子測定法
  • 原子物理学
  • 精度測定

背景:

  • 最先端の原子時計は,光学格子時計 (OLC) を含め,原子レベル間の精密なエネルギー差測定に依存しています.
  • OLCの安定性は,局所振動器のレーザーノイズ (ディックノイズ) と測定量子ノイズからの標準量子限界 (SQL) によって制限されます.
  • 以前のエンタグレメントを用いてSQLを上回る試みは,より不安定なマイクロ波時計に限られ,光学クロックトランジションの実験的な実証はありませんでした.

研究 の 目的:

  • 光学格子クロックトランジションの絡み合いの生成を実験的に実証する.
  • 光学格子時計を 標準の量子限度を超えて操作する
  • タイムメーキングの精度と精度を向上させるためのエンタグリングの可能性を紹介する.

主な方法:

  • イテルビウム-171の光学格子クロック移行を利用した多原子の絡み合いの状態の作成.
  • 絡み合った原子アンサンブルを用いたラムゼイ配列の実装.
  • 時計の安定性を評価し,SQLとの性能を比較するためにアラン偏差の測定.

主要な成果:

  • 局所振動器のノイズを考慮した後に,SQL以下のアラン偏差を持つラムゼイ配列を証明した.
  • 数百個のイテルビウム-171原子の集合を用いて,SQLに対する[Formula: see text]デシベルのメトロロジカル・ゲインを達成した.
  • 巻き込みによる平均化時間の2.8 ± 0.3分の1の縮小が観察され,時計の性能が向上したことを示した.

結論:

  • この研究は,OLC移行で多原子絡み合いの状態の作成を成功裏に実証し,SQLを超えた操作を可能にします.
  • 最先端の光学格子時計の性能を大幅に改善する 有効な経路を提供する.
  • この進歩により 時計の精度と精度が向上し 物理学の基礎テストや 地位測量や 重力波検出に 影響を及ぼすことが期待されます