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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...

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Scanning SQUID Study of Vortex Manipulation by Local Contact
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Quantum magnetomechanics with levitating superconducting microspheres.

O Romero-Isart1, L Clemente, C Navau

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany. oriol.romero-isart@mpq.mpg.de

Physical Review Letters
|October 23, 2012
PubMed
Summary

Researchers demonstrate ground-state cooling and quantum superposition preparation for superconducting microspheres using magnetic trapping near quantum circuits. This method isolates mechanical motion, paving the way for large objects in the quantum regime.

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Area of Science:

  • Quantum physics
  • Quantum optics
  • Optomechanics

Background:

  • Superconducting circuits are crucial for quantum information processing.
  • Controlling the quantum state of macroscopic objects is a significant challenge.
  • Mechanical resonators offer a platform for exploring quantum phenomena.

Purpose of the Study:

  • To demonstrate ground-state cooling of a superconducting microsphere.
  • To prepare quantum superpositions of the microsphere's center-of-mass motion.
  • To explore the potential of superconducting qubits and magnetic microtraps for macroscopic quantum control.

Main Methods:

  • Magnetic trapping of a superconducting microsphere.
  • Proximity coupling to a superconducting quantum circuit.
  • Utilizing the Meissner state to minimize environmental decoherence.

Main Results:

  • Achieved ground-state cooling of the microsphere's motion.
  • Successfully prepared quantum superpositions of the microsphere's mechanical state.
  • Demonstrated high isolation of the microsphere's motion from environmental losses.

Conclusions:

  • Magnetic trapping and superconducting circuits enable quantum control of macroscopic objects.
  • The proposed system offers a promising route to explore the quantum regime with larger systems.
  • This work bridges the gap between quantum circuits and macroscopic mechanical resonators.