Questions tagged [qutip]

For questions about code which makes some use of QuTiP (Quantum Toolbox in Python). It is an open-source software library for simulating the dynamics of closed and open quantum systems. Please don't use the programming tag unless you absolutely think it is related to your question. Basically, questions which involve calculating physical quantities, by doing numerical computations on a computer are suited for this tag.

10 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
4
votes
0answers
226 views

Computing Majorana “Stars”

I'm trying to implement Majorana's "stellar representation" of a spin-$j$ system as $2j$ points on the $2$-sphere in python. Consulting papers including Extremal quantum states and their Majorana ...
2
votes
0answers
59 views

How to define initial state $\rvert \Psi(0) \rangle \equiv \rvert 1, -1 \rangle \otimes \rvert 0 \rangle_{\text{cav}} $ of a system in QuTiP?

Say, we have a $\require{mhchem}\ce{^87Rb}$ atom having an electric dipole transition on the $D_{1}$ line and we have two hyperfine ground states, one on $F = 1$ and one on $F = 2$ level. So, we take ...
2
votes
0answers
73 views

Modifying GRAPE for open quantum systems

This question requires the knowledge of GRAPE. More info can be found here and in this short presentation. I have tried to modify the grape_unitary() function in grape.py also to accommodate open ...
2
votes
0answers
51 views

How to add states on the Bloch sphere from a master equation?

Can you please help me to find an answer to this question: I am using qutip for the study of quantum systems. suppose I have calculated the solution of the master equation using the ...
1
vote
0answers
21 views

Numerical methods for finding an eigen basis of a degenerate Liouvillian

I'm trying to find the steady-state of a master equation, $$\dot{\rho}(t) = \mathcal{L}\rho(t),\tag{1}\label{1}$$ In the form where we vectorise the density matrix and matrixify (??) the Liouvillian ...
1
vote
0answers
37 views

Is the analytical solution right?

This question requires the knowledge of GRAPE. More info can be found here and in this short presentation. In the following jupyter notebook is the analytical solution as in this image right? Because ...
1
vote
0answers
39 views

What is the need of convolution here?

This jupyter notebook implements GRAPE for the synthesisizing a CNOT gate. More info can be found here and in this short presentation. In the following jupyter notebook at In[8] 1 the starting ...
0
votes
0answers
13 views

How to simulate master equation with a term of “cascaded formalism” with QuTiP?

I would like to simulate this master equation with QuTiP. The term in the second line is the so called "cascaded formalism" used for eliminates any feedback from system to the input nodes. But the ...
0
votes
0answers
13 views

Modelling reservoir in Qutip

Is there any way to model reservoir in QuTIP? I was trying to simulate a two sided cavity coupled with a reservoir using QuTIP and I can't find out how the reservoir terms in Hamiltonian are added to ...
0
votes
0answers
35 views

Different values of similar functions

This question requires the knowledge of GRAPE. More info can be found here and in this short presentation. In the following jupyter notebook the result of this line _overlap(result.U_f, ...