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.
13
questions
1
vote
1answer
31 views
Strange Behaviour of MeSolve, McSolve
I'm using Qutip to plot some basic two level dynamics using hamiltonians with a temporal envelope defined as the sum of two error functions, designed to make it more representative of experimental ...
1
vote
1answer
119 views
Can't plot points on the Bloch sphere (QuTip)
I have the really odd problem when it comes to plotting Bloch spheres using QuTip. Plotting state vectors works perfectly fine e.g.
...
2
votes
0answers
50 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 ...
1
vote
0answers
35 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 ...
0
votes
0answers
33 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, ...
1
vote
0answers
36 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 ...
2
votes
0answers
60 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
44 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 ...
4
votes
1answer
247 views
Plotting Bloch sphere in QuTiP
Is there anyone who reproduced the Bloch sphere given in the paper QuTiP: An open-source Python framework for the dynamics of open quantum systems by J. R. Johansson, P. D. Nation, Franco Nori? I am ...
2
votes
1answer
75 views
How to prepare a statistical mixture of $|0,0\rangle $ and $ |1,1\rangle $ in QuTiP?
A QuTiP novice here. It's easy to prepare a pure state in QuTiP. For example, to prepare $\frac{1}{\sqrt{2}}(|0,0\rangle + |1,1\rangle)$:
...
3
votes
1answer
197 views
Drawing tangent vectors to the Bloch sphere with qutip
I need to plot drawings of qubit dynamics on the Bloch sphere. I know QuTip allows to do such drawings but I specifically need to represent evolution velocities on the Bloch sphere so I need to draw ...
6
votes
3answers
503 views
Measuring qubits in QuTiP
How can you measure qubits in QuTiP?
As far as I have seen you can define a Hamiltonian and let it evolve in time. It is also possible to define a quantum circuit, however, measuring and running it ...
4
votes
0answers
197 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 ...
