A Two-Qubit Search: Oracle Sign Flip, Diffusion & the Marked Item
This lesson is part of the course
In this lesson
You run one round of a quantum search over four items: the oracle flips the sign of the marked item, the diffusion step reflects every amplitude about the mean, and the marked item ends up with probability 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