# Tag Info

## New answers tagged matrix-representation

3 votes
Accepted

### math behind rotation gate

why is the rotation gate defined in an exponential format? You might just put it down to convenience. An equally valid definition would be  R_Z(\theta)=\cos\frac{\theta}{2}I-i\sin\frac{\theta}{2}Z, ...
• 46.1k
2 votes
Accepted

### From Hamiltonian to the Pulse Sequence

There's a whole branch of physics/engineering called "optimal control theory" which gives you numerical routines for finding the best control sequences to achieve a particular unitary. ...
• 46.1k
1 vote
Accepted

### Why Qiskit doesn't invert hard coded unitary matrix?

So I have finally have the time to check up with what I wrote in the comment, and what I commented is indeed the case. If I passed in the matrix \$U = \begin{pmatrix} 1 & 0 & 0 & 0\\ 0 &...
• 12.3k

Top 50 recent answers are included