Undergrad SPDC & Entanglement: Downconvert for 3 Particle Entanglement?

  • Thread starter Thread starter entropy1
  • Start date Start date
  • Tags Tags
    Entanglement
Click For Summary
Downconversion of entangled photons can lead to the generation of multiple entangled particles, though direct three-photon outputs from downconversion are uncommon. Typically, four entangled photons can be produced, resulting in two pairs that can be further manipulated in experiments. Cascaded spontaneous parametric downconversion (SPDC) crystals can generate three entangled photons, but they often have different energy levels, complicating experimental applications. Despite these challenges, polarization entanglement among three photons is achievable. The discussion highlights the complexities and possibilities of entangling multiple photons through various methods.
entropy1
Messages
1,232
Reaction score
72
Is it possible to downconvert an entangled photon and could that mean three particles get entangled and why not?

Thanks! :)
 
Physics news on Phys.org
entropy1 said:
Is it possible to downconvert an entangled photon and could that mean three particles get entangled and why not?

Thanks! :)

I have never heard of 3 photons directly coming out of down conversion. However, sometimes you can get 4 that are entangled. That is 2 sets of 2, which happens sometimes with PDC. Once you intercept 1, the other 3 are then entangled. This technique is used for GHZ tests.

https://arxiv.org/abs/quant-ph/9810035

On the other hand: you can get 3 entangled photons from other sources.

https://arxiv.org/abs/1510.05898
 
Reply
  • Like
Likes entropy1 and PeterDonis

Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
View full post »

Similar threads

Undergrad Tips on generating entangled photon pair with SPDC entanglement source
  • · Replies 1 ·
Replies
1
Views
2K
High School 3 Particle entanglement
  • · Replies 23 ·
Replies
23
Views
2K
High School Question about Bell's inequalities and 3-particle entanglement
  • · Replies 14 ·
Replies
14
Views
2K
High School Entanglement & Superposition Probabilities
  • · Replies 27 ·
Replies
27
Views
2K
Undergrad Can a Third Particle Be Entangled with Two Existing Particles Without Breaking Their Entanglement?
  • · Replies 10 ·
Replies
10
Views
1K
Undergrad Construction of an Entangled Photon Source
  • · Replies 18 ·
Replies
18
Views
4K
High School Quantum Entanglement in Practice
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Biphoton: Existence of layered or multiple entanglements
  • · Replies 5 ·
Replies
5
Views
1K
High School Entangled quants inside a particle accelarator
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Is entanglement also for time-like intervals?
  • · Replies 3 ·
Replies
3
Views
2K