関連する実験動画
Updated: Aug 26, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.1K
時間プログラム可能な周波数とその量子制限範囲での使用
Emily D Caldwell1,2, Laura C Sinclair3, Nathan R Newbury4
1National Institute of Standards and Technology (NIST), Boulder, CO, USA.
Nature
|October 5, 2022
まとめ
研究者達は 感知の精度を高める 機敏なプログラム可能な周波数コンブを開発しました このイノベーションにより,量子的に制限された感度があり,距離測定などのアプリケーションの電力需要を大幅に削減します.
科学分野:
- 量子光学
- レーザー物理学
- メトロロジー
背景:
- 周波数カムレーザーは 時間,周波数,距離の正確な測定のための不可欠なツールです.
- 現在のアプリケーションは,従来のの固定出力によって制限され,量子的に制限された感度が妨げられます.
研究 の 目的:
- デジタル制御されたパルスタイミングとフェーズを持つ機敏でプログラム可能な周波数コンブを導入する.
- 硬い周波数の限界を克服することによって,センシングアプリケーションで量子限定感度を実現します.
主な方法:
- ±2アット秒の精度でパルス時間と相をデジタル制御する.
- 弱回転パルス列を一貫して追跡するようにプログラム可能なを構成する.
- 標準的なダブルカムシステムとの電力要求を比較する距離測定システムでの実証.
主要な成果:
- センシングアプリケーションで量子限定感度を達成した.
- デュアルカムシステムと比較して約5,000倍に削減された電力要求.
- 高精度と精度を維持しながら,パルス毎の平均フォトンの1 / 77で範囲を有効にします.
結論:
- 機敏なプログラム可能な周波数は,センシングと計測のための強化された能力を提供します.
- この技術は,硬直な周波数の出力に関連する以前のトレードオフを克服します.
- 潜在的応用には 射程測定,画像撮影,スペクトル検査,高度な実験技術があります
関連する概念動画
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
890
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
890
01:21Time and frequency -Domain Interpretation of Phase-lag Control
139
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
139
01:24Time and frequency -Domain Interpretation of Phase-lead Control
124
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
124
01:18Aliasing
200
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
200
01:26Linear Approximation in Frequency Domain
128
Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
128
01:03IR Frequency Region: Fingerprint Region
1.0K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
1.0K