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I am wondering whether there is a version of adiabatic theorem in the regime of quantum optics. My understanding of quantum optics involves with the interaction between photon and atom. This interaction has always been almost instant. But the perturbation for adiabatic theorem needs to be as slow as possible. This is what confuses me.

Is there any adiabatic theorem for quantum optics at all?

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Coherent laser light is not the same as a whole bunch of independent photons. The state of an atom can be changed adiabatically by laser light. –  Peter Shor Jul 25 '13 at 13:58
    
@PeterShor, thanks! I didn't know that. Just found this (arxiv.org/abs/quant-ph/0507268). –  Omar Shehab Jul 25 '13 at 14:05
    
@PeterShor, what about correlated photons? Can we change the state of a pair of correlated photons (say, generated by SPDC) adiabatically? –  Omar Shehab Jul 31 '13 at 16:39
    
I don't believe people know how to do that. –  Peter Shor Jul 31 '13 at 17:28
    
@PeterShor, Is that even possible? I think a prerequisite is to have single photon or biphoton system with ground and higher energy level. I am not sure how one can make such state. So I asked a separate question here (physics.stackexchange.com/questions/72863/…) –  Omar Shehab Jul 31 '13 at 20:11

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