circuits / amplitude-estimation

Quantum Approximate Counting

✓FEATURED

Simple amplitude estimation circuit estimating the probability of a marked state.

quantumcomputer.dev
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1OPENQASM 2.0;
2include "qelib1.inc";
3qreg q[3];
4creg c[2];
5h q[0]; h q[1];
6// Prep target state
7h q[2];
8// Controlled Grover
9cz q[0],q[2];
10ch q[1],q[2];
11// Inverse QFT
12h q[0];
13cp(-pi/2) q[1],q[0];
14h q[1];
15measure q[0] -> c[0];
16measure q[1] -> c[1];

Cite this circuit

MIT
quantumcomputer.dev. "Quantum Approximate Counting". quantumcomputer.dev/circuits/amplitude-estimation. 2026.