noise spectrum

[mohammad eghbali]

Hi

How can I define a non-markovian noise spectrum?

for example I defined a noise spectrum like below: 

#######################################

def noise_spectrum(w):

    if w >= 0.0:  

        return gamma

    else: 

        return gamma* exp(-w / w_th) * w * (1 + n_th)  

#######################################

Is this definition true for a non markovian systems in qutip?

How can I control the non-markovianity of the system? Can I change the power of w to w**2 for more non-markovianity?

[Paul Nation]

The Bloch-Redfield solver is a Markovian solver.  Fortunately, w^2, or super-ohmic spectra, fit in this category.

-P

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[mohammad eghbali]

Dear Paul,

Thank you for the reply.

I could not find any sample for non-markovian systems in QuTip. Would you please tell me how can I solve a non markovian system?

Best regards,

M. E. Arani

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[Alex Pitchford]

These are examples of non-Markovian solvers:

https://github.com/qutip/qutip-notebooks/blob/master/examples/HEOM-TLS.ipynb

https://github.com/qutip/qutip-notebooks/blob/master/examples/nonmarkov-coherent-feedback.ipynb

https://github.com/qutip/qutip-notebooks/blob/master/examples/nonmarkov-transfer-tensor-method.ipynb

Alex

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