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Faraday Disk Dynamo

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...

Faraday's Law

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...

Quantum Numbers

Quantum Numbers

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.

The Quantum-Mechanical Model of an Atom

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...

Atomic Nuclei: Larmor Precession Frequency

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...

Magnetic Vector Potential

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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Related Experiment Video

Updated: May 31, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Quantum key distribution using quantum Faraday rotators.

Taeseung Choi¹, Mahn-Soo Choi

¹Department of Physics, Korea University, Seoul 136-713, Korea. Barom Liveral Arts College, Seoul Women's University, Seoul 139-774, Korea.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 23, 2011

Summary

This summary is machine-generated.

We introduce a novel quantum key distribution (QKD) protocol using Faraday rotators. This method offers unconditional security against attacks in noisy conditions, even with multi-photon sources.

Related Experiment Videos

Last Updated: May 31, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Area of Science:

Quantum Information Science
Quantum Cryptography
Spintronics

Background:

Quantum Key Distribution (QKD) protocols are essential for secure communication.
Existing protocols face challenges in noisy environments and against sophisticated attacks.
Faraday rotators offer unique quantum mechanical properties for cryptographic applications.

Purpose of the Study:

To propose a new, unconditionally secure QKD protocol.
To enhance QKD security against collective and impersonation attacks.
To explore the feasibility of implementing QKD using semiconductor spintronics.

Main Methods:

Utilizing the quantum mechanical states of Faraday rotators for key distribution.
Analyzing protocol security against collective attacks for multi-photon sources (up to two photons).
Evaluating robustness against impersonation attacks in a noisy environment.

Main Results:

The proposed QKD protocol demonstrates unconditional security against collective attacks.
The protocol is secure even in a noisy environment with multi-photon sources.
It exhibits robustness against impersonation attacks.

Conclusions:

The new Faraday rotator-based QKD protocol offers enhanced security.
The protocol is viable for implementation with current semiconductor spintronics technology.
This research advances secure quantum communication possibilities.