Understanding Interference Between Spin States

  • Thread starter metroplex021
  • Start date
In summary, the conversation discusses the concept of decoherence and the confusion surrounding interference between terms in a superposition. The distinction between interference and coherence is highlighted, and an example is given to explain the possibility of interference between orthogonal states following a transition to another state. The possibility of cross terms in coherent states is also mentioned.
  • #1
metroplex021
151
0
I'm reading about decoherence, and I've found I don't understand the most basic thing. Interference between terms in a superposition is only possible, I thought, if the two terms are not orthogonal. But then how can up and down spin states (with respect to some direction) interfere with one another?!

thanks!
 
Physics news on Phys.org
  • #2
It would help to hear more about the context, but I think you have to make a distinction between interference and coherence. If two states |ψ1> and |ψ2> are orthogonal they can't directly interfere with each other. Nevertheless they may be in a coherent superposition α|ψ1> + β|ψ2>, meaning there remains the possibility of interference between them following a transition to another state |φ>.
 
  • #3
Thank you... I am fundamentally confused! Could you maybe give an example of such a transition that could lead to inference between orthogonal states?
 
  • #4
What I'm suggesting is that when you ask for the transition probability to a state |φ>, if the phases of |ψ1> and |ψ2> have been randomized you'll just get two terms, αα*<φ|ψ1><ψ1|φ> + ββ*<φ|ψ2><ψ2|φ>. But if the states are coherent you'll get as well the cross terms αβ*<φ|ψ2><ψ1|φ> + α*β<φ|ψ1><ψ2|φ>. I may be off base, but I think this relates to what you're asking.
 

FAQ: Understanding Interference Between Spin States

What is spin states interference?

Spin state interference is the phenomenon observed when two or more quantum particles with different spin states interact with each other. This interaction causes a change in the spin states of the particles, resulting in interference patterns.

Why is understanding spin state interference important?

Understanding spin state interference is crucial for various fields of science, including quantum mechanics, materials science, and electronics. It allows us to manipulate and control the behavior of particles, leading to advancements in technology and a better understanding of the quantum world.

How does spin state interference occur?

Spin state interference occurs when two or more particles with different spin states interact through a process called quantum entanglement. This results in the entangled particles sharing a state and exhibiting correlated behavior, which can be observed as interference patterns.

What are some applications of spin state interference?

Spin state interference has various applications, including quantum computing, spintronics, and magnetic resonance imaging. It also plays a crucial role in understanding the behavior of atoms and molecules, leading to advancements in fields such as chemistry and biology.

How do scientists study spin state interference?

Scientists use various techniques, such as spectroscopy and magnetic resonance imaging, to study spin state interference. They also conduct experiments with entangled particles to observe and analyze interference patterns and gain a deeper understanding of this phenomenon.

Similar threads

Replies
2
Views
865
Replies
30
Views
1K
Replies
124
Views
6K
Replies
10
Views
3K
Replies
0
Views
700
Replies
2
Views
921
Back
Top