Talk:Quantum Mechanics/Heisenberg Uncertainty Principle

This fisher information approach may be applicable to understanding why the Heisenberg Uncertainty Principle arises from attempts to measure physical systems []. I am uncertain and will continue reading and cogitating upon it at another time. 8) Lazyquasar 06:06, 26 November 2005 (UTC)

The uncertainty principle has nothing to say about a single particle
The description of the uncertainty principle seems to go beyond what quantum mechanics can actually say. The result can only be obtained for an average of an ensemble of measurements. These could either be a series of measurements at the same time or a set of measurements one after the other.

To show that an individual measurement is not covered, consider putting a beam of electrons into a sharply defined state of momentum. This causes the position in the direction of the motion to be uncertain. You can then stop an arbitrary individual electron at a precise position. At the time of that measurement the position and momentum of the electron are precisely known. Of course, subsequent to the measurement that electron is no longer in a precise state of momentum.

In addition, this can only be done for an arbitrary electron of the set - there is no way to do this for a defined electron.

AN AGRUMENT ABOUT UNCERTINITY
According to uncertainty theory we cannot measure the accurate position and velocity simultaneously.

MY ARGUMENTS ARE THAT IF IN A ROOM I STARTED MOVING WITH THE SPEED OF ELECTRONS THAT IS=2*10 TO THE POWER 6, THE PERSON WHO IS IN THE ROMM CAN NOT DEFINE MY POSITION BECAUSE I AM MOVING WITH A VERY HIGH SPEED SO AT EVERY INSTANT I AM PRESNT EVERY WHERE IN THE ROOM,ACCORDING TO THAT PERSON

AS SAME I WANT TO ADD UP IN THE CASE OF ELECTRONS WE DO NOT HAVE PROPER INSTRUMENT TO MEASURE THE POSTION BEACUSE OF THAT WE CAN NOT CALLED IT AS A UNCERTINITY  JUST THINK ABOUT IT AN ELECTRON IS MOVING WITH HALF THE SPEED OF LIGHT AROUND A SMALL SIZE RADIUS, SO HOW MANY REVOLUTION IT MADE IN A SECOND AND THIS FORM A RING OF THE ELECTRONS MOVING POSTION OR CALLED IT A SPHERE. IF WE HAVE THE PROPER INSTRUMENT TO MEASURE THE VELOCITY AS WELL AS POSTION IN MICRO TO MICRO SECOND THEN NO NEDD OF THIS THEORY.∼∼∼∼ARYAN