Monday 27 July 2020

Heisenberg's Uncertainty Principle - LASER Experiment

This is another interesting video by Science Loop on Youtube. Take a look at an experiment with a "LASER Beam" and an adjustable slit that demonstrates Heisenberg's Uncertainty Principle. Take a look at descriptions, animations and explanation. Introduced first in 1927 by the German physicist Werner Heisenberg, the uncertainty principle states that the more precisely the position of some particle is determined, the less precisely its momentum can be predicted from initial conditions, and vice versa. The formal inequality relating the standard deviation of position σx and the standard deviation of momentum σp was derived by Earle Hesse Kennard later that year and by Hermann Wey in 1928.

The Uncertainty Principle is also called the Heisenberg Uncertainty Principle or Indeterminacy Principle. It was articulated in 1927 by the German physicist Werner Heisenberg. The idea is that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory.

Heisenberg's uncertainty principle is certainly a key principle in quantum mechanics. The general idea is that if we know everything about where a particle is located (the uncertainty of position is small), we know nothing about its momentum (the uncertainty of momentum is large), and vice versa.

In quantum mechanics, the uncertainty principle is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which the values for certain pairs of physical quantities of a particle, such as position, x, and momentum, p, can be predicted from initial conditions.

Quantum Mechanics is a part of quantum field theory. It is a fundamental theory in physics. It describes physical properties of nature on an atomic scale. Quantum Mechanics is the branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave-particle duality, the uncertainty principle, and the correspondence principle.

Take a look at recent news in Quantum Mechanics:

July 24, 2020 Quantum loop: US unveils blueprint for 'virtually unhackable' internet -

July 24, 2020 Physicists create quantum phase battery -

July 22, 2020 Quantum-tunnelling time is measured using ultracold atoms -

July 23, 2020 Quantum physicists crack mystery of 'strange metals,' a new state of matter -

July 9, 2020 The biggest flipping challenge in quantum computing -

July 2, 2020 ‘Hybrid’ Quantum Networking Demonstrated for First Time -

July 13, 2020 Innovative New Device Lights Up the Way for Quantum Technologies -

June 23, 2020 Teleportation Is Indeed Possible – At Least in the Quantum World -

July 1, 2020 Quantum fluctuations can jiggle objects on the human scale -

June 30, 2020 Quantum fridge works by superposing the order of events -


  1. Replies
    1. This video was interesting. The green laser behaved in a way that I didn't think it would.