Can entangled photons be used to explore black holes?

In summary, the conversation discussed the possibility of using entangled photons to explore the interior of a black hole. However, it was concluded that this is not possible due to the fact that entanglement does not transfer information. Additionally, the concept of entanglement monogamy was explained, stating that only one maximally entangled partner is allowed at a time. Therefore, it is not feasible to obtain information from a black hole using entangled photons.
  • #1
Cindy Hops
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Gabriela Lemos and her team successfully entangled photons. Would it be possible to explore the interior of a black hole by letting one of the entangled photons enter beyond the event horizon and observe the impact on the other?
 
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  • #2
Cindy Hops said:
Gabriela Lemos and her team successfully entangled photons. Would it be possible to explore the interior of a black hole by letting one of the entangled photons enter beyond the event horizon and observe the impact on the other?
No. Information cannot be transmitted via entanglement. There are hundreds of threads here on PF about that fact. I suggest a forum search.
 
  • #3
Is there a link that could help me understand why?
 
  • #4
Cindy Hops said:
Is there a link that could help me understand why?
There are hundreds of threads here on PF about that fact. I suggest a forum search.
 
  • #5
I'm new to the site. Thanks for your guidance.
 
  • #6
I think I understand the original question better now. Here is a related reference:

http://www.nature.com/news/entangled-photons-make-a-picture-from-a-paradox-1.15781

Entangled photons are used for imaging. There is no FTL communication (or similar) in this interesting variation.

Cindy: In this experiment, the imaging technique relies on a trick whereby one of the photons is of such wavelength that it passes through the object being scanned. That wouldn't work with a black hole, obviously the light would be trapped in the black hole.
 
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  • #7
As mentioned, entanglement does not transfer information. Suppose photon B falls into the black hole and photon A is for keeps. Then measuring photon A (or a whole series of "photons-A") yield random results. You need photon B to observe any kind of correlation, let alone "impact". And photon B has been eaten.
 
  • #8
What about:
1- Entangle A with B
2- Entangle B with C
3- Send B to the Blackhole.
4- Measure A and C

If measurment shows correlation between A & C then we have info about B still not destroyed. So we got info from inside the black hole!

But that is impossible! what went wrong here?
 
  • #9
Ostrados said:
But that is impossible! what went wrong here?
You haven't explained how you are going to perform this sequence of entanglements. When you do, you will find that either A and C have been entangled or they haven't. If they are, then measurements on them will be correlated no matter what happens to B; conversely if they aren't then measurements on them will not be correlated no matter what happens to B.
 
  • #10
Ostrados said:
What about:
1- Entangle A with B
2- Entangle B with C
3- Send B to the Blackhole.
4- Measure A and C

This experiment is no different from simply throwing B away. Nothing that happens to B will observably affect A or C. Adding a third qubit doesn't make the no-communication theorem suddenly not apply. (Also, you should know that entanglement is monogamous. B can't be fully entangled with both A and C. But okay, assume you're talking about a weaker entangled state.)

The way you actually use entanglement to study a black hole is you make an EPR pair AB, send B into the black hole, wait a bajillion years for the black hole to evaporate, do a gazillion steps of lucky uncomputation to remove all the stuff that got mixed into B, then do some relevant two-qubit measurement on A-vs-B.
 
  • #11
Ostrados said:
What about:
1- Entangle A with B
2- Entangle B with C
3- Send B to the Blackhole.
4- Measure A and C

If measurment shows correlation between A & C then we have info about B still not destroyed. So we got info from inside the black hole!

But that is impossible! what went wrong here?

You may not be familiar with Entanglement Monogamy. If B & C are maximally entangled, then A & B cannot also be maximally entangled. Monogamy = Only one maximally entangled partner allowed at a time. :smile:

A, B and C can be less than maximally entangled. Of course you still cannot obtain information from that black hole if your "probe" doesn't return.
 

1. Can entangled photons be used to detect the presence of a black hole?

Yes, entangled photons can potentially be used to detect the presence of a black hole. When two particles are entangled, they share a quantum state and any change to one particle will also affect the other. This means that if one particle of an entangled pair is influenced by a black hole, the other particle will show a correlated change. By measuring these correlations, we may be able to infer the presence of a black hole.

2. How can entangled photons be used to study the properties of a black hole?

Entangled photons can provide insights into the properties of a black hole by allowing us to observe quantum effects near the event horizon. These effects can reveal information about the black hole's mass, spin, and charge. By measuring the entangled photons, we can also gain a better understanding of the behavior of particles and fields in the extreme conditions near a black hole.

3. Can entangled photons be used to observe Hawking radiation from a black hole?

Yes, entangled photons may be able to provide evidence of Hawking radiation from a black hole. Hawking radiation is a theoretical form of radiation that is emitted by black holes due to quantum effects near the event horizon. By measuring the correlations between entangled photons, we may be able to detect this radiation and confirm its existence.

4. Are there any challenges in using entangled photons to explore black holes?

Yes, there are several challenges in using entangled photons to explore black holes. One major challenge is the difficulty in creating and maintaining entangled photon pairs over large distances, as the entanglement can easily be disrupted by environmental factors. Additionally, interpreting the measurements of entangled photons near a black hole can be complex and requires advanced theoretical models.

5. How could the use of entangled photons lead to new discoveries about black holes?

The use of entangled photons has the potential to lead to new discoveries about black holes by providing a new way to study these mysterious objects. By observing the correlations between entangled photons, we may be able to gather information that was previously inaccessible through traditional methods. This could potentially lead to a better understanding of the fundamental nature of black holes and their role in the universe.

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