Uncertainty principle (stationary state)

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SUMMARY

The discussion centers on the derivation of the uncertainty principle in stationary states, specifically addressing the transition from the ">=" sign to "=" in mathematical expressions. The participants emphasize the importance of the commutator between the position operator (##\hat{x}##) and the Hamiltonian operator (##\hat{H}##) in understanding the Heisenberg uncertainty relations. Key points include the implications of omitting the potential energy term "V" during calculations and the appropriateness of using "approximate" when taking square roots in quantum mechanics.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly the uncertainty principle.
  • Familiarity with operators in quantum mechanics, specifically position (##\hat{x}##) and Hamiltonian (##\hat{H}##).
  • Knowledge of commutators and their significance in quantum theory.
  • Basic proficiency in mathematical manipulation involving inequalities and square roots.
NEXT STEPS
  • Study the derivation of the Heisenberg uncertainty principle in quantum mechanics.
  • Learn about the properties and applications of commutators in quantum mechanics.
  • Explore the implications of potential energy terms in quantum state calculations.
  • Review mathematical techniques for handling inequalities in quantum mechanical contexts.
USEFUL FOR

Students of quantum mechanics, physicists working on theoretical models, and anyone interested in the mathematical foundations of the uncertainty principle.

nazmus sakib
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I have to derive
11 15 2015 4 21 AM Office Lens.jpg

I did all the way but stuck with the ">=" to "=" sign. what is the logic behind it ? is it safe to write "approximate" while taking the square-root on both side ? or the energy term "V" has gone during the calculation so it has only momentum "p" ?
 
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It should be a ##\geq## sign. Concerning the homework (you should post in the homework section!) think about what's the commutator between ##\hat{x}## and ##\hat{H}## and what it has to do with the general Heisenberg uncertainty relations for arbitrary pairs of observables!
 

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