This just occurred to me and I don't expect to be the first one to address it:
It is said that in a specific measurement basis, the outcome of a measurement in this basis is determined by chance.
But in how far is this the case, since if the eigenvectors are for example ##\overrightarrow{A}##...
One sees "Collapse" language all the time, and yet it seems there's a very simple argument that shows that it's not necessary. Suppose we measure ##\hat A## twice, at an earlier and at a later time, then the joint probability density for the measurement results being ##u## and ##v##...
I'm not sure where this thread belongs; it is essentially a topic at the intersection between quantum optics, human physiology and even psychology, but I will focus more or less on the implications for quantum physics, so I just opted for this subforum.
There is a recent article over Scientific...
Hi. This is my first posting on the Physics Forum so please forgive any issues as a result. I am a (reasonably educated) lay person with a strong physics interest with extensive readings -- so please be patient with my questions. :-> My questions and interest in these issues are sincere.
I...
Greg Bernhardt submitted a new PF Insights post
Interview with Mathematician and Physicist Arnold Neumaier
Continue reading the Original PF Insights Post.
Arnold will welcome science questions and comments only.
Consider the Gaussian position measurement operators $$\hat{A}_y = \int_{-\infty}^{\infty}ae^{\frac{-(x-y)^2}{2c^2}}|x \rangle \langle x|dx$$ where ##|x \rangle## are position eigenstates. I can show that this satisfies the required property of measurement operators...
Are there fundamental limits on the accuracy for measuring both position ##q## at time ##t## and momentum ##p## at time ##t+\Delta t##, with tiny ##\Delta t##?
If yes, why?
If no, why can't one then measure (in principle) both ##q## and ##p## arbitrarily well at the same time ##p## (which is...
Quantum mechanical foundations are usually phrased in terms of measurement. I believe this is the main cause why these foundations remain shaky after almost 100 years of a good mathematical basis. Classical mechanics never had any reference to measurement in its foundations, and hence it was...
First off, I am new to this forum.. However I wanted
To find out if anyone would be able to help me calculate
How much a steel bar (2 in. In diameter, 5 ft. Lengthwise)
Would be able to hold up without bending?
Homework Statement
Homework Equations
How to find error in resistance ?
The Attempt at a Solution
I found out the resistance without error.
But What is the way to figure out an error of an instrument ?
Hello, sorry if I created new thread that is already open, but I did not find answer. I would like to ask you about measurement problem (double slit experiment) and many worlds. When interference pattern is created, the dot on screen just show us in which branch or world we are. But if we...