All Questions
Tagged with programming qutip
39 questions
2
votes
0
answers
166
views
How to simulate a beam splitter in QuTiP?
I'm trying to mix two states on a beam splitter whose unitary operator is
$$\hat{U}=e^{i\theta \left( \hat{a}^†\hat{b} + \hat{a}\hat{b}^† \right)},$$
where $\hat{a}$, $\hat{b}$ are annihilation ...
- 21
1
vote
0
answers
57
views
Is mcsolve from QuTiP Optimal for Solving Large Systems in the Lindblad Master Equation?
I am transitioning from using Mathematica to Python for my work on quantum systems, specifically focusing on solving the Lindblad Master Equation. For this purpose, I've started using the mcsolve ...
1
vote
1
answer
46
views
Unexpected behavior of trapped ion's motional mode (phonon) heating simulation
I'm a novice at qutip simulation.
I was recently trying to use qutip to simulate the heating effect of a trapped ion by defining a jump operator defined with heating rate.
Below is the code of my ...
- 21
0
votes
0
answers
45
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Cosine of an operator (a+a.dag()).cosm() in Qutip does not work as it should
As mentioned in the title, the .cosm() method in QuTip fails to give the correct evolution under the Hamiltonian. I am trying to define the Hamiltonian of a non-linear LCJ circuit as follows:
...
- 11
0
votes
0
answers
39
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Particle number expectation value in QuTip
I am learning now to use QuTiP by going through their documentation site. I am trying to understand what does the argument - particle number expectation value in thermal density matrix do? How does it ...
- 33
2
votes
2
answers
433
views
Python package for quantum computations based on symbolic variables
I am searching for a quantum package in Python that can enable me to calculate, for example, a density matrix symbolically and display the results in variable form rather than numerically. I am aware ...
- 111
2
votes
1
answer
379
views
QuTiP ptrace function results do not recreate original composite system
I have a qutip density matrix fullsystem for a system composed of two quantum systems with ...
- 455
1
vote
0
answers
71
views
How to use parameters in QuTiP?
I am working with QuTiP to do some calculations based on my proposed Hamiltonian. The Hamiltonian of my system has some coupling constants that show the strength of coupling between matter and light(...
- 117
2
votes
0
answers
65
views
Is there a Qutip equivalent of "expand_operator" for superoperators?
I want to calculate a superoperator for a small noisy subsystem consisting of $k$ qubits, and expand it to $n > k$ qubits, where the remaining $n-k$ qubits are not subject to any noise. ...
- 422
1
vote
1
answer
403
views
Eigenstates differ between Qutip and Quspin
I am currently trying to adapt a code working well with Qutip to Quspin to optimize it.
I managed to create what I believe are the same systems with both libraries, but I don't get the same ...
- 131
1
vote
0
answers
43
views
0
votes
1
answer
197
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QuTip newbie need to understand .reshape()
I am a quantum physics researcher but till now I have been using Mathematica symbolic language for solving quantum problems. I wanted to develop numerical skills as well so I just started to learn ...
- 11
1
vote
0
answers
79
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How to check the jmat operators on Qutip?
I'm trying to reproduce this Qobject form Qutip
https://qutip.org/docs/latest/guide/guide-tensor.html#a-two-level-system-coupled-to-a-cavity-the-jaynes-cummings-model
but, I'm using the Jmat ...
- 11
1
vote
1
answer
30
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Operating Hamiltonian on discrete variable state [closed]
I have a hamiltonian consisting of combinations of a and a(dragger). i need to act this on discrete variable state like |0,0,0,1> and so on. Is there any library to do these kinds of operations?
1
vote
2
answers
615
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Generating and executing large Pauli rotations in Python
I am interested in generating collective Pauli X, Y and Z spin operators for the purpose of rotating $2^N$ dimensional state vectors $|\psi\rangle$ (in the computational basis) for a quantum protocol. ...
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