Operators in a three level system

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Discussion Overview

The discussion revolves around identifying the operators corresponding to independent observables in a three-level quantum system, specifically states |1>, |0>, and |-1>. The scope includes theoretical aspects related to quantum mechanics and operator algebra.

Discussion Character

  • Homework-related, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant expresses difficulty in establishing the operators for a three-level system, noting that they can represent an arbitrary 3x3 Hermitian matrix but are unsure about the corresponding observables.
  • Another participant suggests using matrices for a spin one system as a potential approach.
  • A different participant proposes considering the basis for SO(3) as a relevant framework.
  • One participant requests to see the matrices the original poster has derived to provide further suggestions.
  • Another participant emphasizes the need to determine the operators and their commutation rules, mentioning possible observables like energy, angular momentum, spin, and momentum.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as multiple approaches and suggestions are presented without agreement on a specific method or solution.

Contextual Notes

The discussion highlights the complexity of identifying observables in a three-level system and the potential dependence on the definitions of the operators and their commutation relations. There are unresolved aspects regarding the specific matrices and their interpretations.

Who May Find This Useful

Students and researchers interested in quantum mechanics, particularly those studying multi-level quantum systems and operator theory.

dantypas
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I'm having the worst time with a homework problem, in which I am asked to establish the operators which correspond to the independent observables of a three level system( states |1> , |0>,|-1> ) . I know that the operators should be 3x3 matrices, so I tried to express an arbitrary 3x3 Hermitian matrix in terms of a base set of 3x3 matrices, as it can be easily done with the 2 level system, where one gets the indentity operator and the 3 Pauli matrices. The thing is that I end up with the identity operaror and 9 more matrices! Even if this is correct, what are the observables which corespond to these matrices?

Any help would be greatly appreciated.
 
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You can use the matrices for a spin one system.
 
try the basis for SO(3).
 
If you could show us these matrices we could have some suggestions.

Michel
 
First you have to determine what the operators are, and their commutation rules -- presumably. there's energy, and angular momentum, perhaps spin, perhaps momentum, ...

Regards,
Reilly Atkinson
 

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