Collapse operators in 2nd order correlation function

[Urmimala Dewan]

Hello group members,

Hope this email finds you well. I have a confusion regarding collapse operators in 2nd order correlation function.

Say, I have a master equation with non-Linbladian terms such as equation 9( photo attached).

And I want to calculate the 2nd order correlation function. 

correlation_3op_2t(H, state0, tlist, taulist, c_ops, a_op, b_op, c_op, solver='me', args=None, options=None)

How do I incorporate the non-Linbladian terms into the collapse operators or is there any other way to calculate this? 

Thank you in advance.

Regards,

Urmimala

[Perry Rice]

it may be possible to put them in lindblad form as sigma+^=0

[Perry Rice]

sigma_+^2=0.  Dephasing for a two level atom, you have Gamma(sigz rho sigz -rho). But its in Lindblad form as you can write it as (Gamma/2)(2 sigz rho sigz - sigz^2 rho-rho sigz^2) as sigz^2=1.  You can also move stuff around with commutators

[ahmed ghareeb]

You can use internal function like
Spost and spre
Which convert Hamilton from operator to super operator form

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[ahmed ghareeb]

Op=simgap()*sigmam()
Then commutator
Spre(op)-spost(op)