## Top new questions this week:

### Why do we care about the number of $T$ gates in a quantum circuit?

When reading this question and quickly reading some of the linked papers, I wondered why was the number of $T$ gates specified along the number of controlled-$X$ gates. I've often read that ...

circuit-construction quantum-circuit clifford-group

### What is the meaning of "shots" and "rounds" in Stim?

I'm running simulations using Stim to get logical error rate vs. physical error rates of some quantum error correcting codes (QECC). I looked into the documentation, but I'm confused about the meaning ...

programming error-correction stim

### Are there direct usefull applications of the quantum Fourier transform not requiring heavy other subroutine

I know that the quantum Fourier transform has many applications such as order finding (which is used in Shor algorithm), phase estimation, etc. However those algorithms require extra subroutines which ...

algorithm

### At what depth and for what architecture are random quantum circuits $1$-designs?

I was confused about something related to quantum $1$ designs. Let us recap two facts we know about random circuit ensembles that form a $1$ design. $1$ design, for a quantum circuit over $n$ qubits, ...