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Related Concept Videos

Aliasing01:18

Aliasing

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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...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Mass Analyzers: Overview01:13

Mass Analyzers: Overview

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Sampling Theorem01:15

Sampling Theorem

1.5K
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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.
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.3K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Quantum sensing with arbitrary frequency resolution.

J M Boss1, K S Cujia1, J Zopes1

  • 1Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland.

Science (New York, N.Y.)
|May 27, 2017
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Summary
This summary is machine-generated.

Researchers developed a quantum sensing technique with unprecedented frequency resolution, enabling highly sensitive detection of oscillating magnetic fields. This breakthrough utilizes quantum lock-in detection for applications in spectroscopy and quantum simulation.

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Area of Science:

  • Quantum technologies
  • Quantum sensing
  • Precision measurement

Background:

  • Quantum sensing utilizes controlled quantum systems for highly sensitive and precise measurements.
  • Existing methods often have limitations in frequency resolution tied to the qubit probe.

Purpose of the Study:

  • To implement a novel quantum sensing concept with arbitrary frequency resolution.
  • To achieve high sensitivity and precision in detecting oscillating signals.

Main Methods:

  • Utilized quantum lock-in detection for continuous signal probing.
  • Employed the electronic spin of a single nitrogen-vacancy center in diamond as the quantum probe.
  • Demonstrated detection of oscillating magnetic fields.

Main Results:

  • Achieved a frequency resolution of 70 microhertz over a megahertz bandwidth.
  • Demonstrated enhanced sensitivity with a signal-to-noise ratio exceeding 10^4 for a 170-nT test signal over 1 hour.
  • Showcased the independence of frequency resolution from the qubit probe, limited only by an external clock.

Conclusions:

  • The implemented quantum sensing technique offers superior frequency resolution and sensitivity.
  • This method has significant potential for applications in magnetic resonance spectroscopy, quantum simulation, and advanced signal detection.