- Rotating Wave Approximation (RWA)
- Born Approximation

3. The initial radiation field density operator
commutes with the free Hamiltonian, and the reservoir is not

affected by the
interactions with the system

4. Markov Approximation:

All these 4 approximation is called Born-Markov
Approximation.

*-Source : Yoshihisa Yamamoto & Atac Imamoglu, Mesoscopic Quantum Optics*
## 7 comments:

i wish i can understand these thing

Im really sorry for not elaborate more. Its so busy. maybe I will put along the explanation when Im in writing stage. As for now, I just can put the step-by-step calculation So I can refresh my understanding.

This method is used to derive master equation for a system interacts with reservoir which the dissipation will be included. once the dissipation is took into account, then the unitary time evolution method (the simpler derivation)is inapplicable to study the interaction. So we use master equation to get the density matrix elements. using density matrix elements, we can calculate any optical properties interested.

I believe you have already know these and familiar with the terms... If you requires more axplanation, please pray for me so I can finish earlier than I will have more time to share the physics behind....hehehhe... thanks in advance... pray ye...

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Thanks for that. I am interested in Quantum Computing (and currently doing Masters at University at Buffalo, USA). I would recommend Introduction to Quantum Optics: From the Semi-classical Approach to Quantized Light - Gilbert Grynberg.

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