How Do Eigenstates and Eigenvalues Relate to Quantum Observables?

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SUMMARY

The discussion focuses on the relationship between eigenstates and eigenvalues in the context of a Hamiltonian defined as H=C(|2><1|+|1><2|), where C is a constant and |1> and |2> are eigenstates of an observable A. The eigenstates of the Hamiltonian are identified as |1>+|2>, |1>-|2>, -|1>-|2>, and -|1>+|2>, with corresponding eigenvalues C, -C, C, and -C. The probability of the system being in the state |2> is derived from the eigenstate representation.

PREREQUISITES
  • Understanding of quantum mechanics concepts such as eigenstates and eigenvalues.
  • Familiarity with Hamiltonian operators in quantum systems.
  • Knowledge of observable operators and their role in quantum mechanics.
  • Basic linear algebra, particularly in the context of matrices and vector spaces.
NEXT STEPS
  • Study the properties of Hamiltonians in quantum mechanics.
  • Learn about the implications of eigenvalues in quantum state measurements.
  • Explore the mathematical derivation of eigenstates from Hamiltonians.
  • Investigate the role of probability amplitudes in quantum state representation.
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Students and professionals in quantum mechanics, physicists working with quantum systems, and anyone interested in the mathematical foundations of quantum observables and their implications.

martyf
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Homework Statement



I have the hamiltonian :

H=C(|2><1|+|1><2|)

where :
C=costant
|1> and |2> are eigenstates of an osservable A.

what are the eigenstate and eigenvalues of the hamiltonian?
what is the probability that the system is in the state |2>?

The Attempt at a Solution



eigenstates :

|1>+|2>, |1> - |2>, -|1> - |2>,-|1>+|2>

eigenvalues (respectively):

C , -C, C, -C

ad es:

H(|1>+|2>)=(C(|2><1|+|1><2|)) (|1>+|2>)=C |2> <1|1> + C |2><1|2> + C |1> <2|1> + C |1> <2|2>= C |2> <1|1> + C |1> <2|2>= C (|1>+|2>)
 
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martyf said:

The Attempt at a Solution



eigenstates :

|1>+|2>, |1> - |2>, -|1> - |2>,-|1>+|2>

eigenvalues (respectively):

C , -C, C, -C

A 2x2 matrix should only have 2 eigenstates.
 

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