I Two-photon Stimulated Raman Transitions

Nijiro
Messages
2
Reaction score
0
Hello everyone!

I don't know much about quantum physics. I'm an amator, but I want to expand and deepen my knowledge in quantum. So, I decided on the Quantum Gravity Gradiometer to be the subject of my supervised personal initiative work. But I'm currently stuck with many things among which are Raman Transitions. So, the gradiometer uses atom interferometry, which is realized through two-photon stimulated Raman Transitions. I read the letter published by Mark Kasevich and Steven Chu on the matter, I got the gist of it: it's similar to a Mach Zenhder interferometer with the light and atoms roles interchanged. The interferometer uses Raman pulses and I assume that they're Laser beams with specific frequencies to stimulate Raman Transitions in atoms (please correct me if I'm mistaken). However, I still don't get what are the "two photons" in "Two-photon Stimulated Raman Transition"? Wikipedia says that the molecule simultaneously absorbs both pump and Stokes photons. I assume they are the "two photons". But what is a Stokes photon? All I get when I google it are Stokes lines and Stokes shift.

Please ask me for clarification if any of my sentences is ambiguous as I'm not native in English.
Thank you all in advance.
 
Physics news on Phys.org
Do you have any references for any of the terms that you put in bold in your post?
 
PeterDonis said:
Do you have any references for any of the terms that you put in bold in your post?
Hello!
Yes, I do.
- Mark Kasevich and Steven Chu, Atomic interferometry using stimulated Raman transitions, Phys. Rev. Lett. 67, 181 – Published 8 July 1991.
DOI: https://doi.org/10.1103/PhysRevLett.67.181
- Ben Stray, A Cold Atom Gravity Gradiometer with Field Application Performance. Thesis, Univ. Birmingham (2021), pp 21-43.
https://etheses.bham.ac.uk/id/eprint/11762/1/Stray2021PhD.pdf
 
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