|Φ+⟩ correlated
What to notice
Before measurement, neither qubit owns a definite Z result. When one is measured, the pair reveals a shared correlation.
Quantum connection laboratory
QuantumEntanglement
Create a linked qubit pair. Each result is random, yet the two results reveal a pattern that classical independent coins cannot reproduce.
1Entangle2Predict3Measure
Choose the correlation
The X gate flips Bob's qubit, changing matching outcomes into opposite outcomes.
Prediction challengeWhat will repeated Z measurements show?
Make a predictionThen collect evidence from many pairs.
Number of pairsMore pairs make the pattern clearer
|00⟩0
|01⟩0
|10⟩0
|11⟩0
Random alone
Alice cannot predict whether she will see 0 or 1. Each local result is approximately 50/50.
Correlated together
When Alice and Bob compare their records in the same basis, the relationship becomes visible.
|Φ+⟩ = (|00⟩ + |11⟩) / √2
No instant message
Entanglement creates correlations, but Alice cannot control her random result to send information faster than light.
Reflect
Ask the AI tutor →How can two random results still be connected?
Look at each column separately, then compare the pair labels. Randomness and correlation describe different parts of the experiment.