Linked Questions

39 votes
6 answers

Having the derivative be an operator

How do I create an operator which acts like a derivative to everything to the right of it: for example: $ \left( \partial_x + \partial_y + z \right ) x \psi $ How do I make that evaluate to: $x \...
Andrew Spott's user avatar
  • 1,581
11 votes
2 answers

Defining quantum-mechanical Bra and Ket operations

I have the following ket in the Fock basis: $\vert3, 0 ,1\rangle$, where each entry defines the number of photons in a particular mode and can take any one of the following numbers: 0, 1, 2, 3. As a ...
Sid's user avatar
  • 977
12 votes
3 answers

Is there a way to do Quantum Computing in Mathematica notebook?

I saw 2 efforts in that direction: WSS17 and WSS16, but I am not sure if there is something in the latest Mathematica that actually allows users to simulate quantum gates. Can anyone please point me ...
0x90's user avatar
  • 599
12 votes
1 answer

multiplication of vector spaces

Original Question Disclaimer: The question motivated by the product of Hilbert spaces which arises from separate degrees of freedom which a system might contain in quantum technical system. Examples ...
Yair M's user avatar
  • 601
4 votes
1 answer

Hadamard Lemma and commutators algebra

I would like to implement the following formula, which goes under the name of Hadamard Lemma: $ e^A \, B \, e^{-A} = \sum_{k=0}^{+\infty} \frac{1}{k!} [A,B]_k $ where $ [A,B]_0 = B , \...
AndreaPaco's user avatar
1 vote
1 answer

Convert, using the Pauli matrices, an $n \times m$ matrix of quaternions into a $2 n \times 2 m$ matrix with complex entries, and vice versa

I'd like to go between $n \times m$ matrices with quaternionic entries to (using, it would seem, the Pauli matrix conversion scheme) to $2 n \times 2 m$ matrices with complex entries, and vice versa. ...
Paul B. Slater's user avatar
2 votes
1 answer

Multiply out product of sums

For a specific quantum mechanical problem I need to multiply out operators in order to calculate a trace by hand. For example I need a Hamiltonian squared with $H^2$. The Hamiltonian contains of a few ...
pbx's user avatar
  • 842
2 votes
0 answers

Outer product using the quantum mathematica package

I am using the quantum Mathematica package and am trying to do computations that require me to use the outer (tensor) products of Pauli matrices. I would define this as, for example, ...
user39257's user avatar
1 vote
1 answer

Forming Kronecker products for "non-adjacent" vector spaces

In quantum mechanics, we often want to build operators acting on multiple particles by simply "Kronecker-ing" operators from the single-particle spaces. That is, if I have some matrix $A$ acting on ...
miggle's user avatar
  • 667
0 votes
0 answers

Is it possible to perform the following computation in mathematica?

Consider the following defined commutation relations: $$[\hat a,\hat a^{\dagger}]=1$$ $$[\hat b,\hat b^{\dagger}]=1$$ $$[\hat a,\hat b]=0$$ (where the usual algebra of commutators holds) Let us now ...
Lost's user avatar
  • 226
3 votes
0 answers

Pattern Matching and overloading NonCommutativeMultiply [duplicate]

My goal right now is to implement some rules like linearity etc for noncommuting operators (arbitrary matrices etc). This is partly an exercise for me to understand MMA better so giving me a package ...
Lior Blech's user avatar