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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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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.
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Magnetic Fields01:27

Magnetic Fields

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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Magnetic Field of a Solenoid01:18

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
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Energy In A Magnetic Field01:24

Energy In A Magnetic Field

2.8K
If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
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Hybrid setup for stable magnetic fields enabling robust quantum control.

Frederick Hakelberg1, Philip Kiefer2, Matthias Wittemer2

  • 1Albert-Ludwigs-Universität Freiburg, Physikalisches Institut, Hermann-Herder-Straße 3, 79104, Freiburg, Germany. frederick.hakelberg@physik.uni-freiburg.de.

Scientific Reports
|March 15, 2018
PubMed
Summary
This summary is machine-generated.

We developed a low-cost hybrid magnet and coil system for highly stable magnetic fields crucial for quantum technologies. This system achieves precise field control and stability, enabling advanced applications in quantum sensing and information processing.

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Area of Science:

  • Physics
  • Quantum Technologies
  • Metamaterials

Background:

  • Precise and stable magnetic fields are essential for quantum metrology, sensing, information processing, and simulation.
  • Existing methods for generating such fields can be complex and costly.

Purpose of the Study:

  • To introduce a novel, low-cost hybrid assembly of rare-earth magnets and coils for generating highly stable magnetic fields.
  • To characterize the tuneability and stability of this system using a single trapped ion.

Main Methods:

  • A hybrid assembly combining rare-earth magnets and magnetic field coils was constructed.
  • A single Magnesium ion (Mg+) in a radio-frequency surface-electrode trap under ultra-high vacuum was used for characterization.
  • The system's field strength, spatial uniformity, tuneability, and temporal stability were measured.

Main Results:

  • A magnetic field strength of ~10.9 m T with spatial variation <10^-6 within a 150 μm spherical volume was achieved.
  • Field tuneability demonstrated a relative precision of ≤2×10^-5.
  • Passive temporal stability was better than 1.0×10^-4 over one hour, with active stabilization for slow drifts.
  • Coherence times >6 seconds were observed using a first-order field insensitive transition.
  • Demonstrated magnetic field sensing of ≥0.2 μT oscillating at ~60 MHz.

Conclusions:

  • The developed hybrid magnetic field system offers a low-cost, stable, and tunable solution for various quantum applications.
  • The system's performance, validated by trapped-ion measurements, meets stringent requirements for precision and stability.
  • This approach is suitable for compact and robust applications with power and load constraints.