Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.4K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.4K
Paramagnetism01:30

Paramagnetism

2.6K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K
Quantum Numbers02:43

Quantum Numbers

39.2K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
39.2K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

780
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...
780
Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

1.7K
Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
1.7K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

763
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...
763

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Rapid atomic-signal-based in-situ magnetic compensation for unshielded spin-exchange relaxation-free atomic magnetometer.

The Review of scientific instruments·2026
Same author

Crosstalk reduction in optically pumped magnetometers arrays for biomagnetic measurement.

The Review of scientific instruments·2025
Same author

A movable unshielded magnetocardiography system.

Science advances·2023
Same author

A New Recognition Method for the Auditory Evoked Magnetic Fields.

Computational intelligence and neuroscience·2021
Same author

Active Magnetic-Field Stabilization with Atomic Magnetometer.

Sensors (Basel, Switzerland)·2020
Same author

Recording brain activities in unshielded Earth's field with optically pumped atomic magnetometers.

Science advances·2020

Related Experiment Video

Updated: Sep 16, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.7K

Sensitivity of quantum magnetic sensing.

Liwei Lei1, Teng Wu1, Hong Guo1

  • 1State Key Laboratory of Photonics and Communications, School of Electronics, and Center for Quantum Information Technology, Peking University, China.

National Science Review
|July 10, 2025
PubMed
Summary
This summary is machine-generated.

Explore the fundamental limits of magnetic field sensing. This study investigates whether quantum or classical magnetometers offer superior performance for detecting magnetic fields.

More Related Videos

Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
07:13

Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays

Published on: June 28, 2024

1.6K
Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
06:58

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

9.7K

Related Experiment Videos

Last Updated: Sep 16, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.7K
Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
07:13

Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays

Published on: June 28, 2024

1.6K
Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
06:58

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

9.7K

Area of Science:

  • Physics
  • Quantum Mechanics
  • Metrology

Background:

  • Magnetic field sensing is crucial across various scientific and technological domains.
  • Current magnetometers operate on either classical or quantum principles.
  • Understanding the theoretical limits of these technologies is essential for advancement.

Purpose of the Study:

  • To determine the fundamental limits of magnetic field sensing.
  • To compare the performance of quantum and classical magnetometer approaches.
  • To identify the optimal strategy for high-precision magnetic field detection.

Main Methods:

  • Theoretical analysis of magnetometer performance limits.
  • Comparison of quantum entanglement-enhanced sensing with classical measurement techniques.
  • Mathematical modeling of noise sources and signal detection.

Main Results:

  • Quantum magnetometers demonstrate a potential for surpassing classical sensing limits.
  • The fundamental limit is dictated by quantum mechanics, offering enhanced sensitivity.
  • Specific conditions for achieving optimal quantum advantage in magnetic sensing were identified.

Conclusions:

  • Quantum principles offer a pathway to overcome classical limitations in magnetic field sensing.
  • Achieving the ultimate sensitivity requires leveraging quantum phenomena.
  • This work provides a theoretical framework for developing next-generation magnetometers.