EPR experiment with twin photons then interference experiment

In summary, when observing the polarization of one entangled photon, we can determine the polarization of its twin, but the unobserved photon itself will not produce an interference pattern in an interference experiment. This is because entangled photons are not coherent enough.
  • #1
TeCNoYoTTa
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If we have twin photons moving in the opposite direction.

For the first photon we can pass it through a polarizer that will either output a photon with vertical polarization or a photon with horizontal polarization.

after this experiment we now know what will the other unobserved photon polarization will be if it passes through this polarizer (EPR paradox)

My question is .. what will be the results if we used the unobserved photon in an interference experiment. will it produce an interference pattern ?
 
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  • #2
You'll have to tell us a lot more about what you mean by an "interference experiment", starting with what the particle will be interfering with.
 
  • #3
Nugatory said:
You'll have to tell us a lot more about what you mean by an "interference experiment", starting with what the particle will be interfering with.

I am asking if it will interfere with it self. this single unobserved photon that we knew it's polarization by observing the polarization of it's twin. but the photon it self is unobserved.

If we did this experiment multiple times. will there be an interference pattern ?
 
  • #4
TeCNoYoTTa said:
I am asking if it will interfere with it self. this single unobserved photon that we knew it's polarization by observing the polarization of it's twin. but the photon it self is unobserved.

If we did this experiment multiple times. will there be an interference pattern ?

As it happens, the answer is NO. In the general case, entangled photons do not produce interference because they are not sufficiently coherent.

See Zeilinger, page 290, figure 2, there is no direct interference pattern for entangled photons:

Experiment and the foundations of quantum physics (1999)[/QUOTE]
 
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  • #5
DrChinese said:
As it happens, the answer is NO. In the general case, entangled photons do not produce interference because they are not sufficiently coherent.

See Zeilinger, page 290, figure 2, there is no direct interference pattern for entangled photons:

Experiment and the foundations of quantum physics (1999)
[/QUOTE]

Thanks for the answer and the interesting link
 

Related to EPR experiment with twin photons then interference experiment

1. What is the EPR experiment with twin photons?

The EPR (Einstein-Podolsky-Rosen) experiment with twin photons is a thought experiment used to illustrate the concept of quantum entanglement. In this experiment, two photons are created at the same time and place, and then separated. Even when separated, the two photons remain connected and their states remain correlated.

2. How is the EPR experiment with twin photons related to quantum mechanics?

The EPR experiment with twin photons is related to quantum mechanics because it demonstrates the phenomenon of quantum entanglement, which is a fundamental aspect of quantum mechanics. It shows that particles can be connected in a way that is not explained by classical physics, and that their states can be correlated even when separated by large distances.

3. What is the purpose of performing an interference experiment with twin photons in the EPR experiment?

The purpose of performing an interference experiment with twin photons in the EPR experiment is to further demonstrate the phenomenon of quantum entanglement. By measuring the interference pattern of the two photons, it can be shown that their states are correlated, even though they have been separated.

4. How does an interference experiment with twin photons in the EPR experiment support the concept of non-locality?

An interference experiment with twin photons in the EPR experiment supports the concept of non-locality, which refers to the idea that particles can affect each other instantaneously even when separated by large distances. By measuring the interference pattern of the twin photons, it can be shown that their states remain correlated even when separated, which supports the concept of non-locality.

5. What are the potential applications of the EPR experiment with twin photons and interference?

The EPR experiment with twin photons and interference has potential applications in quantum computing, cryptography, and communication. It also helps to further our understanding of quantum mechanics and the nature of reality at a fundamental level.

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