Two Qubits: Four Amplitudes, Basis Labels & the Tensor Product
This lesson is part of the course
In this lesson
You label the four basis states of two qubits in binary, build their amplitudes as products of the single-qubit amplitudes, square them into probabilities and check that they add up to 1.
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Lessons in this course
- One Qubit: Amplitudes, Probabilities & Normalising a State Locked
- Single-Qubit Gates: X, Z and Hadamard as Small Matrices Locked
- Measurement: Probabilities, Simulated Shots & Counts vs Expectation Locked
- Two Qubits: Four Amplitudes, Basis Labels & the Tensor Product Locked
- CNOT & Entanglement: A 4 × 4 Gate, a Bell State & Correlated Shots Locked
- Interference: Why H–H Returns |0⟩ and H–Z–H Returns |1⟩ Locked
- A Two-Qubit Search: Oracle Sign Flip, Diffusion & the Marked Item Locked
- Circuit Summary: Final Probabilities, a Shot Histogram & Why Simulation Grows as 2ⁿ Locked