microsoft/qdk
Publicmirrored fromhttps://github.com/microsoft/qdkAvailable
samples/getting_started/Measurement.qs
34lines · modecode
| 1 | /// # Summary |
| 2 | /// Measurement sample |
| 3 | /// |
| 4 | /// # Description |
| 5 | /// This Q# program demonstrates how to perform measurements in Z basis. |
| 6 | /// |
| 7 | /// # Remarks |
| 8 | /// Quantum measurement is an irreversible operation in which a quantum system |
| 9 | /// is manipulated to yield a numerical result. Measuring a quantum system |
| 10 | /// generally changes the quantum state that describes that system. |
| 11 | operation Main() : (Result, Result[]) { |
| 12 | // Allocate a qubit. Qubit is in |0〉 state after allocation. |
| 13 | use q = Qubit(); |
| 14 | // Flip the state. Qubit is in |1〉 state now. |
| 15 | X(q); |
| 16 | |
| 17 | // The `MResetZ` operation performs a measurement of a single qubit in the |
| 18 | // computational basis, also known as the Pauli Z basis. Then it resets |
| 19 | // the qubit to |0〉 state. `MResetZ` may be more efficient than measuring |
| 20 | // a qubit and resetting it using two separate operations. |
| 21 | let result = MResetZ(q); |
| 22 | |
| 23 | // Allocate a two-qubit array (or register). |
| 24 | use qs = Qubit[2]; |
| 25 | |
| 26 | // The `MResetEachZ` operation measures each qubit in an array in the |
| 27 | // computational basis and resets each qubit to |0〉 state. It returns |
| 28 | // an array of `Result` values. |
| 29 | let results = MResetEachZ(qs); |
| 30 | |
| 31 | // Return all results. In Q#, the result of a measurement is a value |
| 32 | // of the type `Result`, that is, `One` or `Zero`. |
| 33 | (result, results) |
| 34 | } |
| 35 | |