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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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...
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...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...

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Related Experiment Video

Updated: Jun 5, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Spin quantum bit with ferromagnetic contacts for circuit QED.

Audrey Cottet1, Takis Kontos

  • 1Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS (UMR 8551), Université P. et M. Curie, Université D. Diderot, 24 rue Lhomond, 75231 Paris Cedex 05, France.

Physical Review Letters
|January 15, 2011
PubMed
Summary

We propose a new quantum bit design using double quantum dots and ferromagnetic elements for all-electric spin control. This approach enables on-chip manipulation and readout via cavity quantum electrodynamics (QED) techniques.

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Area of Science:

  • Quantum computing
  • Spintronics
  • Solid-state physics

Background:

  • Quantum bits (qubits) are fundamental to quantum computing.
  • Controlling and reading out qubit states efficiently is a key challenge.
  • Existing methods often require complex control mechanisms or specific material properties.

Purpose of the Study:

  • To propose a novel scheme for a spin quantum bit.
  • To enable all-electric manipulation and switchable coupling of the spin qubit.
  • To facilitate on-chip integration of quantum information processing components.

Main Methods:

  • Theoretical proposal of a quantum bit based on a double quantum dot.
  • Utilizing ferromagnetic elements for spin control.
  • Employing interface exchange effects for manipulation.
  • Integrating with a superconducting coplanar waveguide cavity for coupling.

Main Results:

  • Demonstrated theoretical feasibility of all-electric spin manipulation.
  • Proposed a switchable strong coupling mechanism to a cavity.
  • Showcased the scheme's independence from specific band structures.
  • Highlighted potential for realization with various nanoconductors.

Conclusions:

  • The proposed scheme offers a versatile platform for on-chip spin qubit manipulation.
  • Cavity quantum electrodynamics (QED) techniques can be leveraged for qubit readout.
  • This work paves the way for scalable quantum computing architectures.