Two level system Schrodinger Equation problem

In summary, the person is confused about the equation in the red rectangle and why there is only a dC1/dt term and not a dC2/dt term. They mention that ψ contains both C1 and C2 and when the derivative is applied, both should be influenced, but in the final step, C2 disappears. They ask for an explanation of how this step is taken. Another person explains that the equation was initially (dC1/dt) ψ1 + (dC2/dt) ψ2 but when multiplied by ψ1* and integrated, the dC2/dt term drops out due to orthogonality. The person responds with understanding and thanks the other person for
  • #1
TheDestroyer
402
1
Hello guys,

in the attached file, I can't understand how the guy arrived to the equation in the red rectangle.

My problem is: how could there not be dC2/dt term. Why only dC1/dt term?
ψ contains both C1 and C2, and when the derivative is applied, both have to be influenced, and both are functions of time. Why does C2 disappear?

Could someone please explain how this last step is exactly taken?

Thank you for any efforts.
 

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  • #2
Because it had been something like (dC1/dt) ψ1 + (dC2/dt) ψ2. But then he says "multiply by ψ1* and integrate over all space." Well, ∫ψ11 dx = 1 so you don't see it explicitly in the result, just dC1/dt is left in the first term. But ∫ψ12 dx = 0, by orthogonality, so the dC2/dt term drops out completely.
 
  • #3
Got it. Thanks man :)
 

Related to Two level system Schrodinger Equation problem

1. What is a two level system?

A two level system refers to a physical system in which there are only two distinct energy states. This is often used as a simplified model for more complex systems, such as atoms or molecules.

2. What is the Schrodinger equation?

The Schrodinger equation is a fundamental equation in quantum mechanics that describes how the wave function of a physical system evolves over time. It is used to calculate the probabilities of different outcomes of a measurement in quantum systems.

3. How is the Schrodinger equation used to solve the two level system problem?

The Schrodinger equation is used to determine the time evolution of the wave function for a two level system. By solving the equation, we can find the probability amplitudes for the system to be in each of the two energy states at any given time.

4. What are the assumptions made in the two level system Schrodinger equation problem?

The two level system Schrodinger equation problem assumes that the system is in a pure state, meaning that it is not affected by external factors. It also assumes that the system is isolated, meaning that there are no interactions with other systems.

5. What are some applications of the two level system Schrodinger equation problem?

The two level system Schrodinger equation problem has many practical applications, including in quantum computing, nuclear magnetic resonance imaging, and quantum optics. It is also used to study the behavior of atoms and molecules in various physical and chemical processes.

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