Bell-state entanglement
Link two qubits so same-basis measurements agree while each qubit remains locally random.
Back to learning pathMulti-qubit entanglementWhy this experiment matters
What you will do
Experience a joint quantum state that cannot be described as two independent qubits.
- 01
Create superposition on the first qubit.
- 02
Use CNOT to create a Bell pair.
- 03
Measure fresh pairs in the same Z or X basis and sort 00, 11, 01 and 10.
Predict before you measure
Choose one answer to unlock the measurement.
INTERACTIVE
Interactive model
Move the control, then run a measurement. This is a teaching simulation—not hardware output.
Choose one answer to unlock the measurement.
Predict before you measureMake a prediction, then run the measurement to reveal the expected and sampled results.
Measurement results
What the result shows
Ideal same-basis results are only 00 and 11, each about half. In the quantum-state description, neither qubit has an independent definite value.
GUIDED VIDEO
Watch the experiment
Follow the experiment with English narration and English subtitles.
Experience a joint quantum state that cannot be described as two independent qubits.
Full transcript5 · 1:00
- 01Overview
Experience a joint quantum state that cannot be described as two independent qubits.
- 02Experiment steps 1
Create superposition on the first qubit.
- 03Experiment steps 2
Use CNOT to create a Bell pair.
- 04Experiment steps 3
Measure fresh pairs in the same Z or X basis and sort 00, 11, 01 and 10.
- 05What to observe
Ideal same-basis results are only 00 and 11, each about half. In the quantum-state description, neither qubit has an independent definite value.
06 · CHECK
Check what you learned
Make a prediction, then run the measurement to reveal the expected and sampled results.