Related Experiment Video
Updated: Jul 17, 2025
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
12.9K
Quantum electrodynamics of time-varying gratings
Simon A R Horsley1, John B Pendry2
1School of Physics and Astronomy, University of Exeter, Exeter EX4 4QL, United Kingdom.
Summary
Luminal gratings exhibit quantum properties, modeling a Schwarzschild singularity that generates Hawking radiation. This stimulated emission of photon pairs offers a potential laboratory method for observing this phenomenon.
Area of Science:
- Quantum optics
- General relativity
- Theoretical physics
Background:
- Classical radiation exhibits unique properties with luminal gratings near light speed.
- The quantum realm presents even more remarkable phenomena for these gratings.
Purpose of the Study:
- To investigate the quantum properties of luminal gratings.
- To explore their connection to the Schwarzschild singularity and Hawking radiation.
- To propose a laboratory method for observing Hawking radiation.
Main Methods:
- Modeling the effective refractive index of luminal gratings.
- Analyzing the generation of spontaneous Hawking radiation in photon pairs.
- Investigating stimulated emission of photon pairs under external radiation.
Main Results:
- Luminal gratings' effective refractive index models the Schwarzschild singularity.
- This modeling leads to spontaneous Hawking radiation in correlated photon pairs.
- External radiation induces stimulated emission of photon pairs.
Conclusions:
- Luminal gratings possess quantum properties linked to black hole physics.
- They offer a potential pathway for laboratory observation of Hawking radiation.
- Stimulated emission of photon pairs is a key observable.
More Related Videos
Related Concept Videos
02:32The de Broglie Wavelength
26.0K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
26.0K
01:17Space-Time Curvature and the General Theory of Relativity
2.8K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
2.8K
01:15Magnetic Vector Potential
685
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...
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...
685
01:21Energy Associated With a Charge Distribution
1.6K
The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
1.6K
01:24Properties of DTFT II
220
In the study of discrete-time signal processing, understanding the properties of the Discrete-Time Fourier Transform (DTFT) is crucial for analyzing and manipulating signals in the frequency domain. Several properties, including frequency differentiation, convolution, accumulation, and Parseval's relation, offer powerful tools for signal analysis.
The frequency differentiation property is illustrated by considering a DTFT pair and differentiating both sides with respect to ω.
The frequency differentiation property is illustrated by considering a DTFT pair and differentiating both sides with respect to ω.
220
01:24Electromagnetic Wave Equation
1.2K
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...
1.2K