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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Atomic Nuclei: Nuclear Magnetic Moment00:59

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Paramagnetism01:30

Paramagnetism

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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...
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Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Single-Spin Magnetomechanics with Levitated Micromagnets.

J Gieseler1, A Kabcenell1, E Rosenfeld1

  • 1Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA.

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This study introduces a novel mechanical transduction platform for spin qubits. It uses trapped micromagnets to enable direct magnetic coupling for quantum applications.

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Area of Science:

  • Quantum physics
  • Quantum computing
  • Nanotechnology

Background:

  • Individual spin qubits are crucial for quantum information processing.
  • Interfacing qubits with mechanical systems offers new avenues for quantum control and sensing.

Purpose of the Study:

  • To develop a new mechanical transduction platform for individual spin qubits.
  • To enable direct magnetic coupling between micromagnets and spin qubits.
  • To explore applications in quantum mechanics, quantum networks, and metrology.

Main Methods:

  • Trapping single micromagnets using a type-II superconductor near spin qubits.
  • Controlling magnet-superconductor distance during cooldown for 3D trapping.
  • Coupling mechanical oscillator motion to nitrogen vacancy center spin degrees of freedom.

Main Results:

  • Demonstrated 3D trapping of micromagnets with quality factors ~1x10^6.
  • Achieved kHz trapping frequencies for the mechanical oscillator.
  • Successfully coupled mechanical motion to individual spin qubits.

Conclusions:

  • The developed platform enables direct magnetic coupling between mechanical oscillators and spin qubits.
  • This approach offers a new pathway for quantum mechanics experiments with mesoscopic objects.
  • Potential applications include quantum networks and ultrasensitive metrology.