I Biphoton: Existence of layered or multiple entanglements

  • I
  • Thread starter Thread starter Revolucien
  • Start date Start date
  • Tags Tags
    Existence Multiple
Revolucien
Gold Member
Messages
31
Reaction score
4
TL;DR Summary
exisitence of layered or multiple entanglements
I read this recent article describing photon quantum entanglement to produce higher resolution microscope. https://phys.org/news/2023-05-quantum-entanglement-photons-microscope-resolution.html
I am curious if quantum entanglement could exist in layers with a third or more entanglement feature. They specify that they call the two entangled photons a “biphoton”… is there a possibility of a tri- or quad- or more photon entanglement?
 
Last edited:
Physics news on Phys.org
vanhees71 said:
The scientific article is open access:

https://doi.org/10.1038/s41467-023-38191-4
Vanhees71,
I appreciate the article. It is very interesting and describes a little more detail about the use for microscopy, but I was hoping to find something more about the possibility of compound or layered link involving multiple entanglements rather than a single connection.

The forum protocol automatically adjusted my post title to add “Using photon quantum entanglement to produce higher resolution microscope images” not the focus of my question, and I did not see where to change it.

The summary “existence of layered or multiple entanglements” is more to my original question…
“They specify that they call the two entangled photons a “biphoton”… is there a possibility of a tri- or quad- or more photon entanglement?"
 
Revolucien said:
The forum protocol automatically adjusted my post title to add “Using photon quantum entanglement to produce higher resolution microscope images” not the focus of my question, and I did not see where to change it.

The summary “existence of layered or multiple entanglements” is more to my original question…
I have updated your thread title now to your new suggested version. In the future if you want your title updated, just click "Report" on your post and ask the Mentors to update the title. :smile:
 
  • Like
Likes vanhees71 and Revolucien
Revolucien said:
“They specify that they call the two entangled photons a “biphoton”… is there a possibility of a tri- or quad- or more photon entanglement?"
Sure. There is no particular limit to the number of particles N that can be entangled. N=3 and N=4 get a lot of attention in terms of new papers coming out. Many papers even generalize theory to N>2. Actual experiments have been done with many permutations. Check out these links:

Two independent photon pairs versus four-photon entangled states in parametric down conversion
https://arxiv.org/abs/1508.01480
https://arxiv.org/pdf/1510.02665.pdf

Fair warning: these are advanced papers. And yes, it is also possible to entangle systems in multiple bases or degrees of freedom (what you might call "levels"). Also referred to as hyperentanglement.
 
  • Like
Likes vanhees71 and Revolucien
DrChinese,
Thanks for the links... I got some reading to do.
 
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
If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!
Back
Top