Correlation between two particles problem

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SUMMARY

The discussion centers on a quantum mechanics problem involving two non-interacting particles in an infinite potential well. Each particle has a Hamiltonian denoted as H(1) and H(2), with eigenstates |ψ1> and |ψ2> corresponding to their respective energies. The total Hamiltonian is expressed as H = H1 + H2, and the eigenstates of the global system are represented by the tensor product |ψn ψq>. The degeneracy of the lowest two energy levels is a key focus, with participants seeking guidance on how to approach the problem.

PREREQUISITES
  • Understanding of quantum mechanics principles, specifically Hamiltonians.
  • Familiarity with the concept of eigenstates and eigenvalues.
  • Knowledge of infinite potential wells and their energy quantization.
  • Proficiency in tensor product notation in quantum mechanics.
NEXT STEPS
  • Research the derivation of eigenstates and eigenvalues for a two-particle system in quantum mechanics.
  • Study the concept of degeneracy in quantum systems and how it applies to energy levels.
  • Explore the implications of the tensor product in quantum state representation.
  • Examine examples of infinite potential wells and their energy solutions in quantum mechanics.
USEFUL FOR

Students studying quantum mechanics, particularly those preparing for exams involving Hamiltonians and particle systems, as well as educators seeking to clarify concepts related to eigenstates and degeneracy.

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Homework Statement



Consider a physical system made of 2 particles , particle (1) and particle (2)of the same mass m, which don’t interact with each other and which are both placed in an infinite potential well of width a. Denote H(1) and H(2) the Hamiltonians of each particles by |ψ1> and |ψ2> the corresponding eigenstates of the first and second particle with energy (n*pi *hbared)^2 /2m(a^2), and (q*pi*h bared)^2/2m(a^2). In the state of the global system the basis chosen is composed of states |ψn ψq> defined by
|ψn ψq>=|ψn(1)> (tesla product) |ψq(2)>
What are the eigen states and eigen values of the H=H1+H2( total Hamiltonian) and give the degeneracy of the lowest two levels?!

its quantum mechanics cohen p.g 348

Homework Equations





The Attempt at a Solution

I have no idea how to start, i took yesterday and its on my final on Thursday, just a hint on how to start!?
 
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EE said:

Homework Statement



Consider a physical system made of 2 particles , particle (1) and particle (2)of the same mass m, which don’t interact with each other and which are both placed in an infinite potential well of width a. Denote H(1) and H(2) the Hamiltonians of each particles by |ψ1> and |ψ2> the corresponding eigenstates of the first and second particle with energy (n*pi *hbared)^2 /2m(a^2), and (q*pi*h bared)^2/2m(a^2). In the state of the global system the basis chosen is composed of states |ψn ψq> defined by
|ψn ψq>=|ψn(1)> (tesla product) |ψq(2)>
What are the eigen states and eigen values of the H=H1+H2( total Hamiltonian) and give the degeneracy of the lowest two levels?!

its quantum mechanics cohen p.g 348

Homework Equations





The Attempt at a Solution

I have no idea how to start, i took yesterday and its on my final on Thursday, just a hint on how to start!?

It's a 'tensor' product, not a 'tesla' product. But I really wouldn't worry about that. What are the two lowest energy states and how many ways can you pick n and q to occupy each one?
 

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