help

[CARLOS ANDRES GONZALEZ GUTIERREZ]

Hello,

Sorry for this simple question but I am trying to solve the problems of two atoms in a cavity but I am a little confused defining the extended operators, for example

a=tensor(qeye(2),qeye(2),destroy(n))

sm1=?

sm2=?

?: I dont know.

Thank you very much!!

[Paul Nation]

Perhaps you could just do the same thing you did but using the sigmam()
operator in place of the qeye(2)'s and use qeye(n) for the cavity.

Paul

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[royta...@gmail.com]

Hi Paul,

According to my understanding the following should be true:

>>> destroy(2)==sigmam()

since destroy(2) should be same as sigma-minus operator for a two level system.

What I found is rather destroy(2) to be equal to sigma-plus.

In[2]: sigmam()

Out[2]: 

Quantum object: dims = [[2], [2]], shape = [2, 2], type = oper, isherm = False

Qobj data =

[[ 0.  0.]

 [ 1.  0.]]

Following is my version

C:\Anaconda2\lib\site-packages\qutip-3.2.0.dev0-py2.7-win-amd64.egg\qutip\version.pyc

Thanks,

Tanay

[nonher...@gmail.com]

They are not the same. The qobj for a two level system is reversed from that of an oscillator. This makes the spin operators look like one would expect. There is a section of the documentation that discusses this. 

-P

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