circuits / amplitude-estimation

Quantum Approximate Counting

✓FEATURED

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

quantumcomputer.dev
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Source Code

OPENQASM 2.0;
include "qelib1.inc";
qreg q[3];
creg c[2];
h q[0]; h q[1];
// Prep target state
h q[2];
// Controlled Grover
cz q[0],q[2];
ch q[1],q[2];
// Inverse QFT
h q[0];
cp(-pi/2) q[1],q[0];
h q[1];
measure q[0] -> c[0];
measure q[1] -> c[1];

Cite this circuit

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