Algorithm
GHZ State
Problem: create a three-qubit state where all measured bits agree.
Expected output
Counts cluster around 000 and 111.
Core intuition
One H creates a branch; two CX gates share it with the other qubits.
Visual circuit
H 0, CX 0 1, CX 0 2.
Significance
GHZ states reveal multi-party correlation and appear in error-correction thinking.
Limit
More qubits make the state fragile on real noisy hardware.
Circuit DSL
# GHZ qubits 3 H 0 CX 0 1 CX 0 2 MEASURE 0 MEASURE 1 MEASURE 2
Challenge
Which result should be rare?