# Tag Info

### Is there a strategy for a single-shot identification of a Pauli gate?

Prepare a Bell pair $|00\rangle + |11\rangle$. Apply the gate to one of its qubits (either one; doesn't matter). Do a Bell basis measurement. The four possible measurement results are the four ...
• 37.5k

### Expressing a quantum state as a polynomial

I assume $f$ is real because, in your example, the polynomial you gave appears to be real. The dependence on the number of qubits $n$ is pretty straightforward to see. Once you see that, you realize ...
• 2,646

### What are classical analogies for the notions of superposition, entanglement, and interference?

Unfortunately, classical analogies generally can't capture the interesting properties of quantum systems and these analogies are no exception. One challenge is that quantum states can look like they ...
• 7,073

### How to mathematically describe the action of CNOT on the control qubit alone?

The action $\mathcal{E}$ of CNOT on just the control qubit is the composition of two functions: the action \begin{align} \mathcal{C}(\rho)=\text{CNOT}\,\rho\,\text{CNOT}\tag1 \end{align} of CNOT on ...
• 22.9k
Accepted

• 14.5k
1 vote

### Can we somehow relate quantum volume with the total number of gates present in a circuit which the machine can succesfully run without large errors

Quantum volume is a metric designed to quantify the performance and capabilities of a quantum computer. It encompasses various factors like gate fidelity, connectivity, coherence time, and others to ...
1 vote

### Fault Tolerance of 2-transversal gates

I think you are right that such a 2-local gate would be fault tolerant with "fault-tolerant distance 3" as you say. I think the reason that you don't see this idea around is that it is more ...
• 3,939

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