• Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.


New printer friendly PO pages!

Migration to Bielefeld University was successful!

Please vote for this year's PhysicsOverflow ads!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback


(propose a free ad)

Site Statistics

204 submissions , 162 unreviewed
5,024 questions , 2,178 unanswered
5,344 answers , 22,683 comments
1,470 users with positive rep
815 active unimported users
More ...

Recent questions tagged quantum-mechanics

Quantum mechanics (as opposed to classical mechanics) is that part of physics where Planck's number $\hbar$ cannot be neglected. It covers all quantitative microscopic physics (below the level of molecules) but also certain aspects of macroscopic physics such as superconductivity.

Quantum mechanics is characterized by the fact that not all observable quantities (considered as part of an algebra) commute with each other. As a consequence, the collection of states (positive linear operators on the observable algebra) has a structure different from that familiar from classical mechanics: Even in pure states (states that cannot be written as mixture of other states), most observable quantities have an intrinsic uncertainty. Most familiar is the Heisenberg uncertainty relation that specifies a positive lower bound on the product of the uncertainty of position and momentum in nonrelativistic quantum mechanics. 

+ 0 like - 0 dislike
0 answers 70 views
+ 0 like - 0 dislike
1 answer 56 views
+ 1 like - 0 dislike
0 answers 126 views
+ 0 like - 0 dislike
0 answers 133 views
+ 0 like - 0 dislike
0 answers 249 views
+ 0 like - 0 dislike
0 answers 177 views
+ 1 like - 0 dislike
0 answers 319 views
+ 0 like - 0 dislike
0 answers 220 views
+ 0 like - 0 dislike
0 answers 247 views
+ 1 like - 0 dislike
0 answers 629 views

user contributions licensed under cc by-sa 3.0 with attribution required

Your rights