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## Main Question or Discussion Point

I am trying to integrate the following concepts and don't fully understand it:

entanglement, interference, complimentary (two photon vs one photon), uncertainty principle

Perhaps a faq could be made

Below are a set of question and statements please answer/modify/correct where required.

1. Entangled particles don't have single particle interference

however

2. Entangled particles can interfere with each other

3. One photon and two-photon interference is complimentary

as you increase the degree of entanglement, the degree of single particle interference decreases

4. In other words, if you have two entangled particles A & B

then the more coherent A is with itself, the less coherent (and hence less entangled) A is with B

5. Entangled particles are always coherent with each other (A is in coherence with B)

6. how does uncertainty principle relate with entanglement?

7. What does coherence within a single particle/photon mean? does it mean the waves (from the photon) that are travelling the various paths --- are all in phase?

8. Single photon interference is known as 2nd order interference (as long as it's entangled with another photon (?))

9. Two- photon (also known as entangled photon) interference is called - forth order interference.

10. In layman terms, roughly speaking:

if you are entangled....

you cannot be self-coherent, but you are coherent wrt the other photon

if you are not entangled....

its possible to be self-coherent (and hence have self-interference)

and

also coherent with some other particle/photon

but then, you are not entangled

entanglement, interference, complimentary (two photon vs one photon), uncertainty principle

Perhaps a faq could be made

Below are a set of question and statements please answer/modify/correct where required.

1. Entangled particles don't have single particle interference

however

2. Entangled particles can interfere with each other

3. One photon and two-photon interference is complimentary

as you increase the degree of entanglement, the degree of single particle interference decreases

4. In other words, if you have two entangled particles A & B

then the more coherent A is with itself, the less coherent (and hence less entangled) A is with B

5. Entangled particles are always coherent with each other (A is in coherence with B)

6. how does uncertainty principle relate with entanglement?

7. What does coherence within a single particle/photon mean? does it mean the waves (from the photon) that are travelling the various paths --- are all in phase?

8. Single photon interference is known as 2nd order interference (as long as it's entangled with another photon (?))

9. Two- photon (also known as entangled photon) interference is called - forth order interference.

10. In layman terms, roughly speaking:

if you are entangled....

you cannot be self-coherent, but you are coherent wrt the other photon

if you are not entangled....

its possible to be self-coherent (and hence have self-interference)

and

also coherent with some other particle/photon

but then, you are not entangled

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